CN104818000A - Ternary refrigerant mixture for pulsating heat pipe - Google Patents
Ternary refrigerant mixture for pulsating heat pipe Download PDFInfo
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- CN104818000A CN104818000A CN201510237962.3A CN201510237962A CN104818000A CN 104818000 A CN104818000 A CN 104818000A CN 201510237962 A CN201510237962 A CN 201510237962A CN 104818000 A CN104818000 A CN 104818000A
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- working medium
- heat pipe
- pulsating heat
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- graphene oxide
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- 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
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
Abstract
The invention discloses a ternary refrigerant mixture for a pulsating heat pipe. The ternary refrigerant mixture is prepared by evenly mixing a binary working medium graphene oxide dispersion liquid with a binary working medium normal butanol water solution, wherein the concentration of the binary working medium graphene oxide dispersion liquid is 0.5mg/ml; the mass percent of the binary working medium normal butanol water solution is 0.5%; and the binary working medium graphene oxide dispersion liquid and the binary working medium normal butanol water solution are evenly mixed at a volume ratio of 2 to 5. The pulsating heat pipe employing the ternary refrigerant mixture can be started under relatively small thermal load; and the heat transfer property of the pulsating heat pipe can be strengthened within the overall work range, so that the pulsating heat pipe employing the mixed solution as a working medium is relatively small in size and relatively light in weight under the same thermal load, and has a relatively wide application prospect in the field of heat dissipation of electronic parts and components and aviation and aerospace.
Description
Technical field
The present invention relates to phase transformation pulsating heat pipe technical field of heat transfer, particularly relating to a kind of ternary mix working medium for strengthening pulsating heat pipe phase-change heat-exchange and defining method thereof.
Background technology
Pulsating heat pipe is the nineties in 20th century, and for the fast development of electron trade, the power consumption of electronics constantly increases, and heat dissipation capacity sharply rises, the New-type phase change centreless heat pipe proposed by Japanese Akachi.The heat pipe with tradition with wick is compared, and pulsating heat pipe structure is simple, and size is little, lightweight, easy to manufacture, with low cost and performance remarkable, has apply comparatively widely in fields such as the cooling of electronics and aerospace.
Pulsating heat pipe generally curves serpentine configuration by kapillary, is vacuumized by kapillary in advance, then fills part working medium.In operational process, heat absorption rear section working medium undergoes phase transition, and forms vapour, the liquid plug of stochastic distribution, by the flowing of vapour, liquid plug, heat is delivered to release end of heat from heat absorbing end in pipe.Therefore pulsating heat pipe is divided into evaporator section, adiabatic section and condensation segment three part.
Because pulsating heat pipe is generally bent by kapillary to form, its bore is less, and therefore the hot physical property of fluid working substance is just extremely important to the heat-transfer capability of pulsating heat pipe.Generally adopt pure refrigerant-water the earliest, as the working medium of pulsating heat pipe.In the last few years, many software engineering researchers invent have studied multiple working medium, strengthened the heat transfer property of pulsating heat pipe, comprise ethanol, liquid nitrogen, nano-fluid, from moistening fluid etc.
For unitary working medium, as ethanol, liquid nitrogen, ethanol etc., although to compare water low for starting power, its heat transport limitation is not high yet; And water is compared to these unitary working medium, although heat transport limitation is higher, starting power is also higher, so these unitary working medium are not the good Substitute Working Medium of this working medium of water.
Nano-fluid and belong to binary working medium from moistening fluid.Nano-fluid is by the Binary mixtures of nanoparticle disperse in base fluid (being generally water), has higher heat conductivility, therefore can strengthen the heat-transfer capability of pulsating heat pipe.But due to the heat storage performance that nanoparticle is larger, make starting power comparatively higher than water, and when heating power is larger, nano-fluid easily lose its stability, causes adopting heat pipes for heat transfer degradation; From the aqueous solution that moistening fluid is higher alcohols, due to the existence of higher alcohols, boiling point is lower than water, and therefore startability is better.In addition, its surface tension characteristics is different from the characteristic of water with temperature rising in unidirectional reduction, but after reaching certain temperature, its surface tension increases along with the rising of temperature, namely presents so-called inverse horse traction height Buddhist nun effect.Be conducive to the backflow of liquid to high-temperature zone from this characteristic of moistening surface tension of liquid, thus improve the heat-transfer capability of pulsating heat pipe.But under higher heating load, due to its heat storage capacity and aqueous phase with, it is too much that evaporator section working medium heat absorption phase transformation produces bubble, and the raising of this heat-transfer capability is just very limited.
Summary of the invention
For pulsating heat pipe working medium Problems existing, the present invention proposes a kind of ternary mix working medium for pulsating heat pipe phase-change heat transfer, effectively can not only ensure the normal startup of pulsating heat pipe under smaller power, significantly can improve the heat-transfer capability of pulsating heat pipe simultaneously at whole operation interval.
The technical scheme adopted for realizing object of the present invention is:
For a ternary mix working medium for pulsating heat pipe, formed by binary working medium graphene oxide dispersion and binary working medium n-butanol aqueous solution Homogeneous phase mixing, the concentration of described binary working medium graphene oxide dispersion is 0.5mg/ml's; The mass percent of binary working medium n-butanol aqueous solution is 0.5%; Described binary working medium graphene oxide solution and binary working medium n-butanol aqueous solution press the volume ratio Homogeneous phase mixing of 2:5.
The principle of the invention: compare with water, nano-fluid has larger thermal conductivity, can strengthen the heat transfer of heat pipe.But because metallics has larger heat storage capacity than glassware for drinking water, be unfavorable for the startup of heat pipe at underload.Under high loads, nano-fluid is easy to lose its stability, causes heat-transfer capability to decline, and the concentration of nanoparticle is higher, and stability is poorer; Lower than water from the boiling point of moistening fluid, it starts, and duty ratio water is lower, and inverse Marangoni (the horse traction height Buddhist nun) effect that its surface tension possesses, is conducive to the backflow of liquid to high-temperature zone, the heat exchange of strengthening pulsating heat pipe.But when thermal load is higher, because phase transformation produces too much steam, enhancement of heat transfer effect is reduced.The ternary mix working medium be mixed to form by n-butanol aqueous solution and graphene oxide dispersion-from moistening nano-fluid, binary working medium nano-fluid and the mixture from moistening fluid, there is nano-fluid and the good characteristic from moistening fluid simultaneously, and overcome its respective defect.
Compared with existing pulsating heat pipe working medium used, the invention has the beneficial effects as follows: ternary mix working medium of the present invention-by graphene oxide dispersion and n-butanol aqueous solution formed from moistening nano-fluid, be applied to pulsating heat pipe, there is the boiling point lower than water, start thermal load lower; Have the thermal conductivity larger than water and heat storage capacity, its heat-transfer capability is better than water; And because in moistening nano-fluid, nanoparticle concentration is lower than the nano-fluid of same volume, its stability is better, when thermal load is higher, better from the stability of moistening nano-fluid; From the surface tension of moistening nano-fluid, there is inverse horse traction height Buddhist nun effect, be conducive to the backflow of liquid to high-temperature zone, thus the exchange capability of heat of strengthening pulsating heat pipe.Start thermal load from moistening nano-fluid lower than water, and heat-transfer capability is higher than water by about 10% at low load; Heat-transfer capability is higher than water by about 7% under high loads, and under nominal situation, its heat-transfer capability is higher than water by about 15%.Under equal heat-transfer capability, use this size from the moistening nano-fluid pulsating heat pipe that is working medium less.
Accompanying drawing explanation
Fig. 1 is working medium surface tension variation with temperature graphic representation;
The pulsating heat pipe of Fig. 2 a to be graphene oxide dispersion be working medium and the comparison diagram of pulsating heat pipe heat transfer property taking water as working medium;
Fig. 2 b take n-butanol aqueous solution as the pulsating heat pipe of working medium and the comparison diagram of pulsating heat pipe heat transfer property taking water as working medium;
Fig. 2 c be by graphene oxide dispersion and n-butanol aqueous solution formed from moistening nano-fluid be the pulsating heat pipe of working medium and the pulsating heat pipe heat transfer property comparison diagram taking water as working medium.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
For a ternary mix working medium for pulsating heat pipe, by two kinds of binary working medium by a certain percentage mixed configuration form.Two kinds of binary working medium should meet following basic demand:
1) described two kinds of binary working medium are with water is the solution of base fluid;
2) described binary working medium one is for having the nano-fluid of high thermal conductivity, and the thermal conductivity of metal nanoparticle is the bigger the better, and the particle diameter of metal nanoparticle is the smaller the better;
3) described binary working medium two inverse horse traction height Buddhist nun effect for surface tension presents at a certain temperature from moistening fluid.
4) graphene oxide solution of binary working medium one nano-fluid to be concentration be 0.5mg/ml; Binary working medium two for massfraction be the n-butanol aqueous solution of 0.5%; Two kinds of binary working medium, by volume for the ratio of 2:5 mixes, form ternary mix working medium.
Performance test to ternary mix working medium of the present invention:
1, ternary mix working medium pulsating heat pipe performance test:
(1) working medium one nano-fluid selects concentration to be the graphene oxide solution of 0.5mg/ml.
(2) working medium two for massfraction be the n-butanol aqueous solution of 0.5%;
(3) two kinds of working medium carry out mixed configuration ternary mixing solutions according to the ratio that volume ratio is 2:5;
(4) Pocket-Dyne surface tension instrument is used to measure the surface tension of the ternary mix working medium of deionized water, graphene oxide solution, n-butanol aqueous solution and graphene oxide solution and n-butanol aqueous solution mixed configuration respectively, each value measurement 5 times, getting its mean value is experimental result, as Fig. 1.Contrast finds have from moistening nano-fluid and from the same variation tendency of moistening fluid, therefore have the flow characteristics from moistening fluid from moistening nano-fluid.
(5) Hotdisk TPS2500s heat transfer analysis instrument is adopted to measure the thermal conductivity of the ternary mix working medium of deionized water, graphene oxide solution, n-butanol aqueous solution and graphene oxide solution and n-butanol aqueous solution mixed configuration respectively, each value measurement 3 times, getting its mean value is experimental result, as table 1.As shown in Table 1, although the ternary mix working medium thermal conductivity of graphene oxide solution and n-butanol aqueous solution mixed configuration is lower than graphene oxide solution thermal conductivity, but far above the thermal conductivity of deionized water and butanol solution, therefore ternary mix working medium has the characteristic of nano-fluid concurrently.Concrete data are as table 1.
Table 1 working medium thermal conductivity experimental data
(6) four kinds of working medium are filled to pulsating heat pipe respectively, liquid filled ratio is 50%, studies under vertical state to the heat transfer characteristic of pulsating heat pipe under different thermal load.Adopting heat pipes for heat transfer performance utilizes the thermal resistance of heat pipe to assess.The enhancement of heat transfer effect of two kinds of binary working medium and ternary working medium opposite heat tube is by assessing the strengthening rate of the pulsating heat pipe heat transfer property taking water as working medium.
(7) result shows, as Fig. 2, although graphene oxide solution (nano-fluid) and butanol solution (from moistening fluid) all can strengthen the heat transfer of pulsating heat pipe, will to be better than these two kinds of solution mixed configuration two kinds of binary working medium in the enhancement of heat transfer effect of whole workspace from moistening nano-fluid.
The above is only one embodiment of the present invention, it should be noted that, for those skilled in the art, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, as nano-fluid selects non-oxidized graphite alkene solution, such as cupric oxide solution, and select n-pentanol solution to configure ternary mix working medium from moistening fluid; Or change the proportioning etc. of two kinds of binary working medium, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. a class is used for the ternary mix working medium of pulsating heat pipe, and it is characterized in that, formed by binary working medium graphene oxide dispersion and binary working medium n-butanol aqueous solution Homogeneous phase mixing, the concentration of described binary working medium graphene oxide dispersion is 0.5mg/ml's; The mass percent of binary working medium n-butanol aqueous solution is 0.5%; Described binary working medium graphene oxide solution and binary working medium n-butanol aqueous solution press the volume ratio Homogeneous phase mixing of 2:5.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106939155A (en) * | 2017-04-10 | 2017-07-11 | 广东工业大学 | A kind of method of heat-transfer working medium and preparation method thereof and adopting heat pipes for heat transfer |
| CN108130052A (en) * | 2018-01-16 | 2018-06-08 | 广东工业大学 | A kind of novel working medium for strengthening oscillating heat pipe heat transfer and its preparation method and application |
| CN110986644A (en) * | 2019-12-24 | 2020-04-10 | 南京航空航天大学 | Graphene nano refrigerant pulsating heat pipe |
| CN114574163A (en) * | 2020-12-01 | 2022-06-03 | 中融美誉有限公司 | Graphene phase-change energy-gathering dispersion liquid and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106939155A (en) * | 2017-04-10 | 2017-07-11 | 广东工业大学 | A kind of method of heat-transfer working medium and preparation method thereof and adopting heat pipes for heat transfer |
| CN108130052A (en) * | 2018-01-16 | 2018-06-08 | 广东工业大学 | A kind of novel working medium for strengthening oscillating heat pipe heat transfer and its preparation method and application |
| CN110986644A (en) * | 2019-12-24 | 2020-04-10 | 南京航空航天大学 | Graphene nano refrigerant pulsating heat pipe |
| CN114574163A (en) * | 2020-12-01 | 2022-06-03 | 中融美誉有限公司 | Graphene phase-change energy-gathering dispersion liquid and preparation method thereof |
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