CN107365571A - The preparation technology and microchannel heat-transfer working medium of carbon pipe nano-fluid - Google Patents
The preparation technology and microchannel heat-transfer working medium of carbon pipe nano-fluid Download PDFInfo
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- CN107365571A CN107365571A CN201710437376.2A CN201710437376A CN107365571A CN 107365571 A CN107365571 A CN 107365571A CN 201710437376 A CN201710437376 A CN 201710437376A CN 107365571 A CN107365571 A CN 107365571A
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- 239000012530 fluid Substances 0.000 title claims abstract description 152
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 42
- 238000005516 engineering process Methods 0.000 title claims abstract description 27
- 238000012546 transfer Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000002270 dispersing agent Substances 0.000 claims abstract description 62
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 47
- 239000008367 deionised water Substances 0.000 claims abstract description 22
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 19
- 238000010008 shearing Methods 0.000 claims abstract description 11
- 238000004945 emulsification Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 22
- 229940099596 manganese sulfate Drugs 0.000 claims description 17
- 239000011702 manganese sulphate Substances 0.000 claims description 17
- 235000007079 manganese sulphate Nutrition 0.000 claims description 17
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 238000001994 activation Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- MPVXINJRXRIDDB-VCDGYCQFSA-N dodecanoic acid;(2r,3r,4r,5s)-hexane-1,2,3,4,5,6-hexol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO.CCCCCCCCCCCC(O)=O MPVXINJRXRIDDB-VCDGYCQFSA-N 0.000 claims description 7
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 238000000527 sonication Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 5
- 241000408529 Libra Species 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000008236 heating water Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- 210000000481 breast Anatomy 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910052748 manganese Inorganic materials 0.000 claims 1
- 239000011572 manganese Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 35
- 239000000377 silicon dioxide Substances 0.000 abstract description 30
- 229910052681 coesite Inorganic materials 0.000 abstract description 28
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 28
- 229910052682 stishovite Inorganic materials 0.000 abstract description 28
- 229910052905 tridymite Inorganic materials 0.000 abstract description 28
- 239000002245 particle Substances 0.000 description 34
- 235000013339 cereals Nutrition 0.000 description 14
- 239000002105 nanoparticle Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 12
- 230000001965 increasing effect Effects 0.000 description 11
- 239000010949 copper Substances 0.000 description 10
- 238000010298 pulverizing process Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000005642 Oleic acid Substances 0.000 description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 201000000015 catecholaminergic polymorphic ventricular tachycardia Diseases 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229960004643 cupric oxide Drugs 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002071 nanotube Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 241000220324 Pyrus Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- LWZFANDGMFTDAV-BURFUSLBSA-N [(2r)-2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O LWZFANDGMFTDAV-BURFUSLBSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004855 decalinyl group Chemical group C1(CCCC2CCCCC12)* 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- POULHZVOKOAJMA-UHFFFAOYSA-M dodecanoate Chemical compound CCCCCCCCCCCC([O-])=O POULHZVOKOAJMA-UHFFFAOYSA-M 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012208 gear oil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 208000021760 high fever Diseases 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 229940070765 laurate Drugs 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 235000021017 pears Nutrition 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229950006451 sorbitan laurate Drugs 0.000 description 1
- 235000011067 sorbitan monolaureate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Composite Materials (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention discloses the preparation technology and microchannel heat-transfer working medium of carbon pipe nano-fluid, comprises the following steps：(1) raw material is prepared：It is standby to weigh CNT, TNWDIS water dispersants and deionized water, and TNWDIS water dispersants are dissolved in base fluid water and form aqueous dispersant；(2) CNT is added in aqueous dispersant, and adds deionized water, stirred；(3) emulsification shearing；(4) ultrasonic disperse.For the present invention by adding dispersant, emulsification shearing and ultrasonic disperse, it is relatively good to be prepared stability and the dispersiveness of carbon pipe nano-fluid, is suitable as microchannel heat-transfer working medium.Under laminar condition, the field coordination of carbon pipe nano-fluid prepared by the present invention is integrally higher than Cu and SiO2Nano-fluid.When carbon nanotube mass fraction is 1%, and Reynolds number is 15, carbon pipe nano-fluid, Cu nano-fluids and SiO2The field synergy angle of nano-fluid is respectively 65.13 °, 74.54 ° and 77.84 °.
Description
Technical field
The present invention relates to the heat-transfer fluid of field of solar energy utilization.More particularly, to a kind of system of carbon pipe nano-fluid
Standby technique and microchannel heat-transfer working medium.
Background technology
As the single heat-exchange working medium of the continuous development, water, oil, alcohol etc. of relevant heat transfer enhancement technology research is due to its own
Thermal conductivity it is relatively low, can not adapt to current efficient heat transfer technology completely, and the appearance of nano-fluid then can be more
Vacancy of the heat transfer enhancement technology of new generation in terms of material is mended, the research of nano-fluid enhanced heat exchange technology is always researcher pass
The emphasis of note, compared with adding millimeter or micro-size particles augmentation of heat transfer in base fluid, nano-fluid more suitable for practical application,
Turn into one of most attractive novel heat transfer mass transfer working medium.Due to the small-size effect of nano particle itself, its form
Neat liquid molecule is similar to, there is good circulation, frictional resistance is small, is not easy to result in blockage and good heat conductivity, therefore
Applicability is stronger.
Elena etc. adds different activities agent when preparing oil base silica nanometer fluid, and stirred by magnetic bar,
The mode of ultrasonic vibration is sufficiently mixed it, have studied at different temperatures its thermophysical property with activating agent and quality point
Several changing rules.Madhusree etc. is prepared for cupric oxide nano fluid, and base fluid is gear oil and adds oleic acid, cupric oxide
Primary particle size is 40nm, and reunion situation is measured using FTIR and DLS；After the oleic acid that mass fraction is 1% adds, it can make
Liquid dispersion is more stable, and after 4h ultrasonic vibration and 2h magnetic agitation, obtained nano-fluid was put by 30 days
Put and do not occur obvious particle agglomeration still.Hu Qian etc. is prepared to conduction oil nano-fluid, and preparation method is two-step method, and
KD2pro testers and rotation viscometer is respectively adopted to the thermal conductivity and viscosity progress testing research of the nano-fluid prepared；
Testing stand is installed, analyzes the heat transfer characteristic under laminar condition in closed cycle pipe in the range of high temperature.Dan Li etc. are used
One-step method is prepared for copper nano particles, while scattered to improve it by the method synthesis lipophilicity copper nano particles of surface modification
Stability.Using oleic acid as activating agent, using kerosene, toluene and decahydronaphthalenes as base fluid, the heat conduction to prepared nano-fluid
Performance is studied.CNT (CNTs) is initially that Japanese Iijima is had found as a kind of new material, and its theory is led
Heating rate is 6600W/mK, and experiment value can also reach 3000W/mK.Pointed out in Maxwell theories, the high fever of nano-fluid
The conductance thermal conductivity that its own has mainly due to the particle added is high, therefore more and more concern is all poly- by related scholar
Collect in this enhanced heat exchange working medium of new generation of carbon pipe nano-fluid.Ma Lianxiang etc. is Arabic using addition surfactant
The method of glue (GA) prepares carbon pipe nano-fluid, and the hot physical property of carbon pipe nano-fluid through ball milling, acidification is ground
Study carefully.Chen Lifei is handled carbon pipe with mechanical ball mill technology, by obtained carbon tube particle be distributed to ethylene glycol, glycerine and
Nano-fluid is prepared in silicone oil, prepared nano-fluid has good stability and dispersiveness.
By numerous researchs to nano-fluid it can be found that shortage, the nanometer stream of nano-fluid experimental result uniformity
Body mechanism understanding it is not deep enough and prepare stable nano-fluid it is inefficient the problems such as it is still urgently to be resolved hurrily, therefore, to height
The preparation method of stability nano-fluid is probed into and will turned into study nano-fluid physical property change mechanism by testing
Focus from now on.
The content of the invention
It is an object of the present invention to provide a kind of stability and good dispersion, and the carbon pipe nanometer of excellent thermal conductivity
Fluid preparation technique, and a kind of microchannel heat-transfer working medium of the radiator suitable for solar power system is provided.
To reach above-mentioned purpose, the present invention uses following technical proposals：
The preparation technology of carbon pipe nano-fluid, comprises the following steps：
(1) raw material is prepared：It is standby to weigh CNT, TNWDIS water dispersants and deionized water, and by TNWDIS moisture
Powder is dissolved in base fluid water and forms aqueous dispersant；
(2) CNT is added in aqueous dispersant, and adds deionized water, stirred；
(3) emulsification shearing；
(4) ultrasonic disperse.
The preparation technology of above-mentioned carbon pipe nano-fluid, in step (1)：The dosage of TNWDIS water dispersants is CNT
The 15-25wt% of quality；The dosage of CNT is the 0.5-5wt% of carbon pipe nano-fluid gross mass；Base fluid water is deionization
Water, the dosage of base fluid water are limited with that just can dissolve TNWDIS water dispersants.
The preparation technology of above-mentioned carbon pipe nano-fluid, in step (2)：By CNT be added to aqueous dispersant it
Before, activation process first is carried out to CNT：Weigh CNT to be added in 50mL sodium hydroxide solutions, received per 0.03g carbon
Mitron uses 10mL sodium hydroxide solutions, and the concentration of sodium hydroxide solution is 8wt%, and heating evaporation is extremely under conditions of stirring
It is dry, by obtained solid 800 DEG C of constant temperature 3 hours under nitrogen protection, room temperature is cooled to, the solid obtained with distillation water washing is extremely
Cleaning solution is in neutrality；In the ethanol-water solution for the manganese sulfate for being added to 100mL after the solid obtained after washing is dried；In sulphur
In the ethanol-water solution of sour manganese, the volume ratio of second alcohol and water is 1:8, the mass fraction of manganese sulfate is 20wt%, is heated to reflux 5
Hour, gained solid is washed away into manganese sulfate with distilled water after filtering.
The preparation technology of above-mentioned carbon pipe nano-fluid, in step (3)：The CNT for washing away manganese sulfate is immersed in mistake
5-10 hours in water sorbitan laurate emulsion, anhydrous sorbitol laurate in anhydrous sorbitol laurate emulsion
Volume ratio with water is 1：5-10.
The preparation technology of above-mentioned carbon pipe nano-fluid, in step (1)：TNWDIS water is aided in using the method for heating water bath
Dispersant dissolves, and bath temperature is 50-70 DEG C.
The preparation technology of above-mentioned carbon pipe nano-fluid, in step (3)：Shear time is emulsified after 10 minutes, by dispersion liquid
Taking-up, which is statically placed in cooling water, to be cooled down, defoams, and is further continued for shearing.
The preparation technology of above-mentioned carbon pipe nano-fluid, in step (4)：Ultrasonic disperse was cooled and gone after 3~5 minutes
Bubble removing, add up total sonication time and be more than or equal to 30 minutes.
The preparation technology of above-mentioned carbon pipe nano-fluid, comprises the following steps：
(1) CNT, TNWDIS water dispersants and deionized water are weighed with electronics Libra, the dosage of water dispersant is carbon
The 20% of Nanotube quality, TNWIDS water dispersants are dissolved in base fluid water, while it is aided in using the method for heating water bath
Dissolving, water bath heating temperature should be less than or equal to 70 DEG C；
(2) carbon nanotube dust is added in aqueous dispersant, adds in deionized water, stirred, made with glass bar
CNT is completely immersed in aqueous dispersant；
(3) after emulsification is sheared 10 minutes, dispersion liquid is taken out and is statically placed in cooling in cooling water, defoams, is further continued for shearing；
(4) ultrasonic disperse:Ultrasound is cooled after 3~5 minutes and removes bubble removing, accumulative total sonication time is more than or waited
In 30 minutes.
Microchannel heat-transfer working medium, it is made up of CNT, TNWDIS water dispersants and deionized water, TNWDIS water dispersants
Dosage be carbon nanotube mass 15-25wt%, the dosage of CNT is the 0.5- of microchannel heat-transfer working medium gross mass
5wt%.
Beneficial effects of the present invention are as follows：
The present invention chooses nonmetal oxide SiO2Particle and carbon nanotube particulate are raw material, using deionized water as base fluid
Nano-fluid is prepared, from dispersion stabilization and heat conductivility etc., inquires into the changing rule of its Basic Physical Properties and its micro- logical
Enhanced heat exchange application and optimization in road.
The present invention is to SiO2Prepared with carbon pipe nano-fluid, pass through the change rule of its basal heat physical property of experimental study
Rule, and the heat-transfer working medium in microchannel is optimized with reference to field-synergy theory.As a result show, pass through the scattered system of high pressure microjet
Standby SiO2Nano-fluid, compared with being prepared by ultrasonic grind, thermal conductivity factor has integrally risen, but elevation amplitude
Less only 2.89%；When using ultrasonic grind method prepare nano-fluid when, within the specific limits with ultrasonic wave
The extension of grinding time, the grain diameter of nano-fluid reduce, Zeta potential increase, thermal conductivity factor increase.Concentration is 2% carbon
Pipe nano-fluid, add its Zeta potential rise 10mV, thermal conductivity factor rise 0.038W/mK after water dispersant.Add in water
After entering nano particle, the concertedness for the field that exchanges heat is significantly improved, under laminar condition, the field coordination of carbon pipe nano-fluid
It is overall to be higher than Cu and SiO2Nano-fluid.When mass fraction is 1%, and Reynolds number is 15, carbon pipe nano-fluid, Cu nano-fluids
And SiO2The field synergy angle of nano-fluid is respectively 65.13 °, 74.54 ° and 77.84 °.
Brief description of the drawings
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Carbon pipe nano-fluids of Fig. 1 a through ultrasonic oscillation,
Carbon pipe nano-fluids of Fig. 1 b without ultrasonic oscillation；
Fig. 2 a ultrasonic vibration 0.5h nano particle diameters are distributed,
Fig. 2 b ultrasonic vibration 2h nano particle diameters are distributed；
Influence of Fig. 3 dispersants to particle diameter and Zeta potential；
Fig. 4 difference preparation methods are to SiO2The influence of Thermal Conductivity of Nanofluids；
The thermal conductivity factor of the different types of nano-fluids of Fig. 5 with mass fraction changing rule；
Influence of Fig. 6 dispersants to carbon pipe Thermal Conductivity of Nanofluids；
Influence of Fig. 7 temperature to carbon pipe Thermal Conductivity of Nanofluids；
Influence of Fig. 8 standing times to carbon pipe Thermal Conductivity of Nanofluids；
Fig. 9 field synergy angles and temperature with Reynolds number changing rule；
Figure 10 differences cool down the field synergy angle of working medium with the changing rule of Reynolds number.
Embodiment
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
Embodiment 1
1 experiment
1.1 materials and reagent
CNT (CNTs) nano particle, is black powdery, purity >=98%, external diameter OD ＞ 50nm, the μ of length 10~20
M, specific surface area SSA ＞ 60m2/ g, manufacturer are Chengdu organic chemistry institutes of the Chinese Academy of Sciences；TNWDIS water dispersants, in light yellow
Transparency liquid, without APEO, the nonionic surfactant containing aromatic group, activity substance content 90wt%, moisture
10wt%, manufacturer are Chengdu organic chemistry institutes of the Chinese Academy of Sciences；Silica (SiO2) nano particle, it is white powder, particle diameter
>=100nm, manufacturer are Shanghai Kent Intelligence Meter Co., Ltd..
1.2 laboratory apparatus and equipment
Electronics Libra, model JA31002, precision 0.01g；Ultrasonic grinder, model YM-1200Y；Emulsification shearing at a high speed
Machine, model B25；High pressure microjet nano-dispersed instrument, model M-110P；Malvern granularity and Zeta potential analyzer, model
Nano ZS90；Hot Disk thermal constant analyzers, model TPS2500S.
The preparation of 1.3 nano-fluids
(1) water base SiO2The preparation of nano-fluid
Method 1：Prepared using the two-step method after optimization, silicon-dioxide powdery is added in deionized water first, uses glass
Glass rod stirs to it, after determining that it is tentatively uniformly dispersed, then after high speed emulsification cutter is sheared 10 minutes, afterwards using ultrasound
Ripple cell separating apparatus, it is further uniform and stable, and analysis ultrasonic activation grinding time is to particle diameter, the shadow of Zeta potential
Ring, so as to obtain the more preferable nano-fluid of quality.
Method 2：On the basis of method one, ultrasonic cell disruptor is substituted with high pressure microjet nano-dispersed instrument,
The different scattered instruments of comparative analysis are to prepared SiO2The influence of nano-fluid heat conductivility and stability.
(2) preparation of water base carbon pipe nano-fluid
It is big for CNT draw ratio, more hold in base fluid compared to CNT compared with other nonmetallic, metal oxides
Easy the problem of mutually winding produces reunion, water dispersant TNWDIS is added in the preparation, it is ensured that carbon pipe stabilization in base fluid
It is scattered.The problem of easily being blocked in microchannel based on carbon pipe nano-fluid, therefore do not select the method for high pressure microjet to carry out
Prepare, prepared using only ultrasonic dispersion.
It is as follows to test specific preparation process：
A. the CNT, TNWDIS water dispersants and deionized water (water dispersant of certain mass are weighed with electronics Libra
Dosage for carbon pipe quality 20%), a certain amount of TNWIDS is dissolved in base fluid water, because TNWDIS at room temperature dissolves
Spend small, while its dissolving is aided in using the method for heating water bath, but temperature should be controlled at no more than 70 DEG C (its cloud point temperature)；
B. carbon nanotube dust is weighed in proportion, is added in deionized water, is stirred with glass bar, CNT is soaked completely
Enter aqueous dispersant；
C. emulsification is sheared 10 minutes at a high speed, and in shear history, dispersion liquid can generate heat, bubble, it is therefore desirable to after shearing 5min,
Dispersion liquid can be taken out to be statically placed in cooling water and cool down, defoam, be further continued for shearing；
D. ultrasonic disperse:Due to during Ultrasonic Pulverization dispersion liquid have heating, produce bubble phenomenon, it is therefore desirable to note
Temperature on meaning observation display panel and the bubbles volume in beaker, were cooled every 3~5 minutes and remove bubble removing, added up
Total sonication time is no less than 30 minutes.
The stability of 2 nano-fluids
The standing observation of 2.1 nano-fluids
With sedimentation observation method then stability can be grown come the preliminary stably dispersing degree for judging nano-fluid, sedimentation time
Good, the sedimentation time, short then dispersion stabilization was poor.
Fig. 1 a is add water dispersant TNWDIS, by high speed shear 10 minutes, are made after sonic oscillation processing 2h
Carbon nanotube mass fraction 2% carbon pipe nano-fluid.Fig. 2 b are that carbon nanotube dust is directly dissolved in deionized water, and
Stirred with glass bar, stand nano-fluid in a moment.It can be seen that by techniques such as high speed shear, Ultrasonic Pulverizations
The nano-fluid prepared, color show uniform black, and stability is preferable；And without any preparation technology, it is simply single
The nano-fluid that pure mixing, stirring form, the black particle largely to suspend is had in water and is occurred, dispersion stabilization is poor.By
This understands that ultrasonic grind plays great role to the dispersion stabilization of nano-fluid.
2.2 nano-fluid grain diameters and Zeta potential
2.2.1 the influence of Ultrasonic Pulverization time
The stability of nano-fluid can be by testing fluid Zeta potential, particle diameter to characterize, choose the carbon prepared and receive
Mitron mass fraction is the 2%, nano-fluid by the different Ultrasonic Pulverization time, and its Zeta potential and particle diameter are surveyed
Examination, inquire into influence of the time of Ultrasonic Pulverization in preparation process to particle diameter and Zeta potential.
Fig. 2 is the carbon pipe nano-fluid particle diameter point for adding carbon nanotube mass fraction 2% prepared by water dispersant TNWDIS
Cloth, in fig. 2 a, when the ultrasonic vibration time is 30min, its particle diameter distribution is not concentrated, and average grain diameter reaches 54.52nm,
In Fig. 2 b, the ultrasonic vibration time reaches 2h, and particle diameter distribution is more concentrated, average value 10.23nm.It can be seen that with Ultrasonic Pulverization
The increase of time, the average size of nano particle are gradually reduced, and the distribution of particle diameter is also increasingly concentrated.
2.2.2 the influence of dispersant
Fig. 3 is influence of the dispersant to grain diameter and Zeta potential in carbon pipe nano-fluid, and preparation method is cut for high speed
Ultrasonic grind is carried out after cutting 10 minutes.The carbon nanotube mass fraction prepared for addition dispersant (divides for 2% nano-fluid
The addition of powder is the 20wt% of CNT addition), in 1~3h, with the increase of ultrasonic vibration time, particle size values by
It is decrescence small, in about 1.5h, the minimum 8.62nm of average grain diameter of carbon nanotube particulate, afterwards with the increasing of ultrasonic vibration time
Add particle size values to change smaller, Zeta potential, which is presented, first increases the trend that reduces again, in ultrasonic vibration about 1.5h, reach maximum-
41.13mV；The addition of dispersant the grain diameter value of freshly prepd nano-fluid is influenceed it is little, but potential value is influenceed compared with
Greatly, it is relatively low that the nano-fluid Zeta potential value of dispersant is not added, is -31.39mV, after this explanation addition dispersant, grain
The increase of mutually exclusive intensity between son, so that whole system is relatively more stable.
3 heat conductivilitys
3.1 preparation methods are different
Experiment uses Hot Disk thermal constant analyzers, and the thermal conductivity of different working medium is tested.For validation test
Accuracy, condition deionised water is sampled test first at 20 DEG C, test result 0.593W/mK, and in document
Data 0.599W/mK coincide, the requirement of laboratory apparatus coincidence measurement.Test environment is 22 DEG C of room temperature, indoor humidity 49%.
Fig. 4 is different preparation methods to SiO2The influence of nano-fluid heat conductivility, it can be seen that pass through high pressure microjet
Made SiO2Nano-fluid, with passing through the made SiO of ultrasonic grind2Nano-fluid is compared, and thermal conductivity factor has integrally risen,
Average elevation amplitude is 2.89%, and this is due to that the operation principle of two instruments is different, is stream the characteristics of high pressure microjet instrument
Body flows out after all entering the high shear stage by charging aperture, and ultrasonic cell disruptor is to send ultrasound by ultrasonic transformer
Ripple disperses to the liquid in beaker, because liquid is not to flow uniformly through dispersal device, can produce particle disperse it is uneven
Phenomenon, stability is relatively low, and therefore, high pressure microjet compares ultrasonic grind, and the nano-fluid heat conductivility of preparation is more preferable.
3.2 variety classes nano-fluids
Fig. 5 is the thermal conductivity factor of different types of nano-fluid with the changing rule of mass fraction, the preparation of nano-fluid
Use ultrasonic grind method, grinding time 1.5h.From the point of view of test result, SiO2Concentration is 0.1wt% SiO2Nanometer
Flow thermal conductivity coefficient is 0.615W/mK, and the carbon pipe Thermal Conductivity of Nanofluids that carbon nanotube concentration is 0.1wt% is
0.672W/mK, work as SiO2When concentration is increased to 5wt%, SiO2Thermal Conductivity of Nanofluids is increased to 0.631W/mK, and carbon
Concentrations of nanotubes is that the thermal conductivity factor of 5wt% carbon pipe nano-fluid is increased to 0.771W/mK, this explanation carbon pipe nano-fluid
Thermal conductivity factor it is overall apparently higher than water and SiO2, this is due to that its material of carbon tube particle heat conductivility itself is far above SiO2With
Water, and with the increase of nano particle portion, carbon pipe and SiO2Thermal Conductivity of Nanofluids gradually increases, the former
Growth rate is more than the latter.
3.3 dispersant
Fig. 6 is influence of the dispersant to carbon pipe Thermal Conductivity of Nanofluids, and preparation uses ultrasonic grind method, is crushed
Time is 1.5h.As can be seen that the overall higher (moisture of carbon pipe Thermal Conductivity of Nanofluids prepared by addition water dispersant TNWDIS
Powder TNWDIS addition is the 20wt% of carbon nanotube mass), when carbon nanotube concentration is 0.1wt%, it is not with adding
The carbon pipe nano-fluid for entering dispersant is compared, and increases 4.8%；When carbon nanotube concentration is 5wt%, thermal conductivity factor increases
9.8%, illustrate that thermal conductivity factor growth rate is more than under the preparation method of addition dispersant and be not added with dispersant, this is due to point
The addition of powder causes interparticle repulsive force increase, Zeta potential rise, therefore the stability of nano-fluid in nano-fluid
It is also better with dispersiveness, it is more beneficial for the performance of heat conductivility.
The influence of 3.4 temperature
Fig. 7 be condition of different temperatures under carbon pipe nano-fluid thermal conductivity factor with particle diameter changing rule, using ultrasonic wave
Breaking method, grinding time be 1.5h when 20 DEG C of room temperature, particle diameter are 79nm, thermal conductivity factor 0.669W/mK, when particle diameter is
During 10nm, thermal conductivity factor 0.687W/mK, 2.4% is increased, it is seen that with the reduction of particle diameter, thermal conductivity factor gradually rises；
When fluid temperature (F.T.) is increased to 60 DEG C by 20 DEG C, 10nm flow thermal conductivity coefficient increases to 0.756W/m by 0.687W/mK
K, 10% is increased, illustrate that temperature has a great influence to heat conductivility, it is outstanding to cause between particle because with the rise of temperature
Brownian movement and the enhancing of microconvection effect, add interparticle collision frequency, cause its thermal conductivity factor to raise.
3.5 standing time
Fig. 8 is influence of the standing time to carbon pipe Thermal Conductivity of Nanofluids, and it is to add to test nano-fluid preparation method
It is 1.5h to enter dispersant and Ultrasonic Pulverization, and test temperature is 22 DEG C of room temperature.As can be seen that the carbon pipe nanometer stream after placing 15 days
Body, the value that its thermal conductivity factor measures when comparing freshly prepared is lower slightly, illustrates that standing time length can influence nano-fluid heat conductivility,
This is due to generate agglomeration after nano-fluid is stood, and reduces the stability of nano-fluid, but thermal conductivity factor reduces width
Degree is only 1%, it is seen that the carbon pipe nano-fluid stability of preparation is preferable, in a short time agglomeration and unobvious.
4 heat-exchange working mediums optimize and field coordination analysis
In order to optimize the heat-exchange working medium of radiator in Fresnel CPVT systems, and combine field-synergy theory analysis microchannel and dissipate
The cooling performance of hot device, field coordination of the deionized water in microchannel heat sink is analyzed first.As shown in Figure 9, go
When ionized water rises to 101.7 by extremely low Reynolds number 14.5, field synergy angle rises to 84.2 ° by 78.3 °, it is seen that in extremely low thunder
During promise number, field coordination is preferable, but field synergy angle rises comparatively fast in extremely low Reynolds number interval, when more than 100 Reynolds numbers, field
Collaboration angle has risen to more than 84 °.When Reynolds number is extremely low, the flow velocity of corresponding water is also smaller, now solar cell table
Face temperature is high, and when Reynolds number is 20, solar cell surface temperature is 399K, and GaAs battery operating temperatures are generally
233.15K~373.15K (- 40 DEG C~100 DEG C), it is clear that now battery surface temperature is beyond normal range of operation.Cause
This is visible, and under the conditions of high power three-level optically focused, battery chip in CPVT systems is applied to using deionized water as heat-exchange working medium
Radiating, effect is not highly desirable.
Figure 10 is the field synergy angle of different cooling working medium with the changing rule of Reynolds number.Received as can be seen that being added in water
After rice grain, the concertedness for the field that exchanges heat is significantly improved, and under laminar condition, the field coordination of carbon pipe nano-fluid is overall
Higher than Cu and SiO2Nano-fluid.When mass fraction is 1%, and Reynolds number is 15, βCNT=65.13 °, βCu=74.54 °,When Reynolds number rises to 200, βCNT=74.88 °, βCu=83.62 °,It can be seen that
As Reynolds number increases, the field synergy angle of deionized water and three kinds of nano-fluid cooling working medium has increased, field coordination
Reduce, when Re is 200, SiO2More than 80 °, but the field of carbon pipe nano-fluid are had built up with the field synergy angle of Cu nano-fluids
Cooperate with angle still less than 75 °, increase it is more gentle, field coordination keep preferably, heat exchange property is improved, this be by
Different in the heat conductivility of different nano-fluids, its influence to thermograde is different, and carbon pipe nano-fluid can be faster
Transmission heat, heat exchanging fluid is reached thermal balance, while thermograde is big when carbon pipe nano-fluid cools down, field synergy angle is then more
Small, on the other hand, the surface tension of variety classes particle, particle lattice, bond energy, collision recovery coefficient etc. are different, also make to receive
The irregular movement degree of rice grain is different, so as to influence the collaboration degree of velocity and temperature gradient vector.
Embodiment 2
The present embodiment and the difference of embodiment 1 are：Before CNT is added into aqueous dispersant, first carbon is received
Mitron carries out activation process：Weigh CNT to be added in 50mL sodium hydroxide solutions, 10mL is used per 0.03g CNTs
Sodium hydroxide solution, the concentration of sodium hydroxide solution is 8wt%, and heating evaporation is consolidated to doing by what is obtained under conditions of stirring
Body 800 DEG C of constant temperature 3 hours under nitrogen protection, are cooled to room temperature, with the solid that distillation water washing obtains to cleaning solution in neutrality；
In the ethanol-water solution for the manganese sulfate for being added to 100mL after the solid obtained after washing is dried；In the alcohol-water of manganese sulfate
In solution, the volume ratio of second alcohol and water is 1:8, the mass fraction of manganese sulfate is 20wt%, is heated to reflux 5 hours, will after filtering
Gained solid washes away manganese sulfate with distilled water.
In the case of other condition identicals, the thermal conductivity factor of gained carbon pipe nano-fluid at least improves 10%, and places
Thermal conductivity factor reduces amplitude less than 0.5% after 15 days, thus is necessary to carry out activation process to commercially available CNT.
Embodiment 3
The present embodiment and the difference of embodiment 1 are：
Before CNT is added into aqueous dispersant, activation process first is carried out to CNT：Weigh carbon nanometer
Pipe is added in 50mL sodium hydroxide solutions, and 10mL sodium hydroxide solutions are used per 0.03g CNTs, sodium hydroxide solution
Concentration is 8wt%, and heating evaporation is to doing under conditions of stirring, and by obtained solid, 800 DEG C of constant temperature 3 are small under nitrogen protection
When, room temperature is cooled to, with the solid that distillation water washing obtains to cleaning solution in neutrality；Add after the solid obtained after washing is dried
Enter into the ethanol-water solution of 100mL manganese sulfate；In the ethanol-water solution of manganese sulfate, the volume ratio of second alcohol and water is 1:
8, the mass fraction of manganese sulfate is 20wt%, is heated to reflux 5 hours, and gained solid is washed away into manganese sulfate with distilled water after filtering.
The CNT for washing away manganese sulfate is immersed in 5-10 hours, dehydration mountain in anhydrous sorbitol laurate emulsion
The volume ratio of anhydrous sorbitol laurate and water is 1 in pears alcohol laurate emulsion：5-10.
In the case of other condition identicals, the thermal conductivity factor of gained carbon pipe nano-fluid at least improves 20%, and place
Thermal conductivity factor reduces amplitude less than 0.2% after 15 days, although being soaked after activation process and activation are carried out to commercially available CNT
Processing, which improves, to be prepared cost and extends preparation time, but the effect of the thermal conductivity factor for improving carbon pipe nano-fluid is non-
Chang Mingxian.
Conclusion
The present invention is to SiO2Prepared with carbon pipe nano-fluid, pass through the change rule of its basal heat physical property of experimental study
Rule, and the heat-transfer working medium in microchannel is optimized with reference to field-synergy theory, research conclusion is as follows：
(1) there is certain influence the Ultrasonic Pulverization time to the particle diameter and Zeta potential of nano-fluid, within the specific limits with
The increase of Ultrasonic Pulverization time, the average grain diameter of nano particle is gradually reduced, and the distribution of particle diameter is also increasingly concentrated, Zeta electricity
Position gradually increase.Mass fraction 2wt% carbon pipe nano-fluid is when the ultrasonic vibration time is 30min, its particle diameter distribution
Do not concentrate, average grain diameter reaches 54.52nm, and the ultrasonic vibration time reaches 2h, and particle diameter distribution is more concentrated, average value 10.23nm；
In about 1.5h, the minimum 8.62nm of average grain diameter of carbon nanotube particulate, now Zeta potential reach maximum -41.13mV.
(2) addition of TNWDIS dispersants influences little on the grain diameter value of nano-fluid, but potential value is influenceed compared with
Greatly, the nano-fluid Zeta potential maximum for adding dispersant is -41.13mV, and does not add the nano-fluid Zeta of dispersant
Potential value is relatively low, is -31.39mV.
(3) thermal conductivity factor of carbon pipe nano-fluid is overall apparently higher than SiO2, concentration is 0.1wt% SiO2Nano-fluid
Thermal conductivity factor is 0.615W/mK, and carbon pipe Thermal Conductivity of Nanofluids is 0.672W/mK, when concentration is increased to 5%,
SiO2Thermal Conductivity of Nanofluids is increased to 0.631W/mK, and the thermal conductivity factor of carbon pipe is increased to 0.771W/mK, with
The increase of nano particle portion, carbon pipe and SiO2Thermal Conductivity of Nanofluids gradually increases, and the former growth rate is more than
The latter.Different preparation methods has certain influence to the heat conductivility of nano-fluid, passes through high pressure microjet nano-dispersed instrument institute
The SiO of system2Nano-fluid, and by the way that compared with prepared by Ultrasonic Pulverization, thermal conductivity factor has integrally risen, but elevation amplitude
Less only 2.89%.
(4) thermal conductivity of carbon pipe nano-fluid is directly proportional to its temperature, with being inversely proportional for the particle diameter of particle.At 20 DEG C, grain
The Thermal Conductivity of Nanofluids that footpath is 85nm is the increase by 2.4% than 10nm, particle diameter be 10nm nano-fluid at 60 DEG C, its
Increase by 10% during 20 DEG C of thermal conductivity ratio；20 DEG C of temperature, the Thermal Conductivity of Nanofluids of 15 days is placed compared with freshly prepd
It is substantially reduced, its amplitude reduced increases with the increase of concentration.
(5) after adding nano particle in water, the concertedness for the field that exchanges heat is significantly improved, under laminar condition, carbon
The field coordination of pipe nano-fluid is integrally higher than Cu and SiO2Nano-fluid.When mass fraction is 1%, and Reynolds number is 15, carbon
Pipe nano-fluid, Cu nano-fluids and SiO2The field synergy angle of nano-fluid is respectively 65.13 °, 74.54 ° and 77.84 °.
(6) immersion treatment is carried out again after carrying out activation process, especially activation process to commercially available CNT, is advantageous to carry
The thermal conductivity factor of high-carbon pipe nano-fluid.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical scheme is extended out still in protection scope of the present invention.
Claims (10)
1. the preparation technology of carbon pipe nano-fluid, it is characterised in that comprise the following steps：
(1) raw material is prepared：It is standby to weigh CNT, TNWDIS water dispersants and deionized water, and by TNWDIS water dispersants
It is dissolved in base fluid water and forms aqueous dispersant；
(2) CNT is added in aqueous dispersant, and adds deionized water, stirred；
(3) emulsification shearing；
(4) ultrasonic disperse.
2. the preparation technology of carbon pipe nano-fluid according to claim 1, it is characterised in that in step (1)：TNWDIS
The dosage of water dispersant is the 15-25wt% of carbon nanotube mass；The dosage of CNT is carbon pipe nano-fluid gross mass
0.5-5wt%；Base fluid water is deionized water, and the dosage of base fluid water be limited with that just can dissolve TNWDIS water dispersants.
3. the preparation technology of carbon pipe nano-fluid according to claim 1, it is characterised in that in step (2)：Carbon is received
Mitron is added to before aqueous dispersant, first carries out activation process to CNT：Weigh CNT and be added to 50mL hydrogen
In sodium hydroxide solution, 10mL sodium hydroxide solutions are used per 0.03g CNTs, the concentration of sodium hydroxide solution is 8wt%,
Heating evaporation is to dry under conditions of stirring, by obtained solid 800 DEG C of constant temperature 3 hours under nitrogen protection, is cooled to room temperature, uses
The solid that distillation water washing obtains is to cleaning solution in neutrality；100mL sulfuric acid is added to after the solid obtained after washing is dried
In the ethanol-water solution of manganese；In the ethanol-water solution of manganese sulfate, the volume ratio of second alcohol and water is 1:8, the quality of manganese sulfate
Fraction is 20wt%, is heated to reflux 5 hours, and gained solid is washed away into manganese sulfate with distilled water after filtering.
4. the preparation technology of carbon pipe nano-fluid according to claim 3, it is characterised in that in step (2)：It will wash away
The CNT of manganese sulfate is immersed in 5-10 hours in anhydrous sorbitol laurate emulsion, anhydrous sorbitol laurate breast
The volume ratio of anhydrous sorbitol laurate and water is 1 in turbid：5-10.
5. the preparation technology of carbon pipe nano-fluid according to claim 1, it is characterised in that in step (1)：Using water
The method auxiliary TNWDIS water dispersant dissolvings of bath heating, bath temperature is 50-70 DEG C.
6. the preparation technology of carbon pipe nano-fluid according to claim 1, it is characterised in that in step (3)：Emulsification is cut
After cutting 10 minutes time, dispersion liquid is taken out and is statically placed in cooling in cooling water, defoams, is further continued for shearing, until CNT point
Dissipate uniform.
7. the preparation technology of carbon pipe nano-fluid according to claim 1, it is characterised in that in step (4)：Ultrasound point
Cooled after dissipating 3~5 minutes and remove bubble removing, it is 1-3 hours to add up total sonication time.
8. the preparation technology of carbon pipe nano-fluid according to claim 7, it is characterised in that in step (4)：Ultrasound point
Cooled after dissipating 3~5 minutes and remove bubble removing, it is 1.5 hours to add up total sonication time.
9. the preparation technology of carbon pipe nano-fluid according to claim 1, it is characterised in that comprise the following steps：
(1) CNT, TNWDIS water dispersants and deionized water are weighed with electronics Libra, the dosage of water dispersant is carbon nanometer
The 20% of pipe quality, TNWIDS water dispersants are dissolved in base fluid water, while its dissolving are aided in using the method for heating water bath,
Water bath heating temperature should be less than or equal to 70 DEG C；
(2) carbon nanotube dust is added in aqueous dispersant, adds in deionized water, stirred with glass bar, carbon is received
Mitron is completely immersed in aqueous dispersant；
(3) after emulsification is sheared 10 minutes, dispersion liquid is taken out and is statically placed in cooling in cooling water, defoams, is further continued for shearing, until carbon
Nanotube is uniformly dispersed；
(4) ultrasonic disperse:Ultrasound is cooled after 3~5 minutes and removes bubble removing, added up total sonication time and be more than or equal to 30
Minute.
10. microchannel heat-transfer working medium, it is characterised in that it is made up of CNT, TNWDIS water dispersants and deionized water,
The dosage of TNWDIS water dispersants is the 15-25wt% of carbon nanotube mass, and the dosage of CNT is microchannel heat-transfer working medium
The 0.5-5wt% of gross mass.
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| CN108975314A (en) * | 2018-09-17 | 2018-12-11 | 苏州纳磐新材料科技有限公司 | Dispersion, preparation method and its system containing carbon nanomaterial |
| CN108975314B (en) * | 2018-09-17 | 2020-09-25 | 苏州纳磐新材料科技有限公司 | Dispersion of carbon-containing nanomaterial, method of making same, and system thereof |
| CN111829924A (en) * | 2020-06-19 | 2020-10-27 | 重庆大学 | Nano fluid stability monitoring system and method |
| CN111829924B (en) * | 2020-06-19 | 2024-03-26 | 重庆大学 | Nanofluid stability monitoring system and method |
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