CN111964514A - Xanthan gum-non-Newtonian nanofluid heat exchanger under pulsating flow field - Google Patents
Xanthan gum-non-Newtonian nanofluid heat exchanger under pulsating flow field Download PDFInfo
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- CN111964514A CN111964514A CN202010890710.1A CN202010890710A CN111964514A CN 111964514 A CN111964514 A CN 111964514A CN 202010890710 A CN202010890710 A CN 202010890710A CN 111964514 A CN111964514 A CN 111964514A
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- pipe
- newtonian
- xanthan gum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/08—Tubular elements crimped or corrugated in longitudinal section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
- F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a xanthan gum-nanofluid heat exchanger under a pulsating flow field, which comprises a novel pipe, an upper support frame, a base and a pulsating pump, wherein the novel pipe comprises a corrugated wall pipe and a U-shaped elbow pipe, and the xanthan gum-non-Newtonian nanofluid is positioned inside the novel pipe. When hot fluid flows through the wave wall pipe on the heat exchanger, the periodic flow field caused by the pulse pump enhances the disturbance of working media in the wave wall pipe, and the strong heat exchange efficiency of the non-Newtonian nano fluid further absorbs the heat of the hot fluid to cool the hot fluid in the heat exchanger. The cooled fluid flows through the corrugated wall pipe and the U-shaped elbow pipe of the novel pipe, and the heat value transfer is strengthened when the cooled fluid flows through the corrugated wall pipe, so that the maximization of the heat exchange effect is achieved, and the purpose of heat exchange is finally achieved.
Description
Technical Field
The invention belongs to the field of engineering equipment, and particularly relates to a xanthan gum-non-Newtonian nanofluid heat exchanger under a pulsating flow field.
Background
The heat exchanger is an energy-saving device for transferring heat between materials between two or more fluids with different temperatures, and is used for transferring heat from the fluid with higher temperature to the fluid with lower temperature to make the temperature of the fluid reach the index specified by the process so as to meet the requirements of process conditions, and is also one of main devices for improving the utilization rate of energy. The heat exchanger industry relates to more than 30 industries such as heating ventilation, pressure vessels, reclaimed water treatment equipment, chemical industry, petroleum and the like, and an industrial chain is formed mutually. Data show that the market scale of the heat exchanger industry in China in 2010 is about 500 million yuan, and the heat exchanger industry is mainly focused on the fields of petroleum, chemical engineering, metallurgy, electric power, ships, central heating, refrigeration and air conditioning, machinery, food, pharmacy and the like. Wherein, the petrochemical industry field is still the largest market of the heat exchanger industry, and the market scale is 150 billion yuan; the market scale of the heat exchanger in the field of electric metallurgy is about 80 hundred million yuan; the market scale of the industrial heat exchanger of the ship is more than 40 million yuan; the market scale of the mechanical industrial heat exchanger is about 40 million yuan; the market scale of the heat exchanger in the central heating industry exceeds 30 million yuan, and the food industry also has a market of nearly 30 million yuan. In addition, a large number of professional heat exchangers are needed in the fields of aerospace crafts, semiconductor devices, nuclear power conventional island nuclear islands, wind generating sets, solar photovoltaic power generation, polycrystalline silicon production and the like, and the markets have the scale of about 130 million yuan. The domestic heat exchanger industry obtains remarkable results in the aspects of saving energy, improving the efficiency of heat transfer, reducing the heat transfer area, reducing the pressure drop, improving the heat intensity of the device and the like. Based on the increase of the stable demand of industries such as petroleum, chemical industry, electric power, metallurgy, ships, machinery, food, pharmacy and the like on heat exchangers, the heat exchanger industry in China will keep stable growth in a period of the future, the heat exchanger industry in China will keep the growth of about 10-15% of the year in 2011 to 2020, and the scale of the heat exchanger industry in China is expected to reach 1500 hundred million yuan by 2020.
However, most of the conventional heat exchangers at present adopt a straight-wall tube heat exchanger and conventional coolants (Freon, ammonia, water, air, brine and the like), the heat exchange efficiency is relatively low, and the effects of energy conservation and emission reduction are not obvious.
Disclosure of Invention
The invention aims to solve the technical problems that the energy utilization of a pipeline system is enhanced, a heat exchanger combining a corrugated wall pipe, a nano fluid and a non-Newtonian fluid is a novel heat exchanger with high efficiency, the corrugated wall pipe has high heat and mass transfer efficiency and is convenient to disassemble; the nano fluid has high heat conductivity coefficient compared with the traditional fluid; the xanthan gum-non-Newtonian nanofluid can further improve the thermal conductivity of the pure nanofluid.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a xanthan gum-non-Newtonian nanofluid heat exchanger under a pulsating flow field comprises a novel pipe, an upper support frame, a base and a pulsating pump;
the support frame is arranged on the base, the support frame is positioned between the upper support frame and the base, and the upper support frame is fixedly connected with the support frame;
a new-shaped pipe is fixedly installed on the support frame and comprises a corrugated-wall pipe and a U-shaped elbow pipe, adjacent corrugated-wall pipes are fixedly connected through the U-shaped elbow pipe, the temperature sensor I is located inside the corrugated-wall pipe, and the temperature sensor II is located inside the U-shaped elbow pipe; the Xanthan gum (Xanthan gum, (C)35H49O29)n) The non-Newtonian nano fluid is positioned inside the new-shaped pipe and used as a nano fluid working medium, and a pulse pump is fixed on the upper support frame and is connected with the inlet end of the new-shaped pipe.
Further, the xanthan gum-non-newtonian nanofluid is a xanthan gum non-newtonian water-based nanofluid containing Cu nanoparticles.
Further, the number of the bellows tubes is greater than the number of the U-elbows.
Furthermore, the number of the corrugated wall pipes is equal to that of the temperature sensors I, and the number of the U-shaped elbows is equal to that of the temperature sensors II.
Furthermore, the novel pipe is formed by sequentially connecting N corrugated pipe pipes provided with temperature sensors I and N-1U-shaped elbow pipes provided with temperature sensors II at intervals, wherein N is a natural number more than or equal to 2.
Furthermore, the temperature sensor I and the temperature sensor II are respectively connected with the power supply through leads.
Further, the overall height of the new-shaped pipe is smaller than that of the support frame.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the device of the invention improves the heat exchange coefficient under the combined action of the corrugated pipe structure and the non-Newtonian fluid nanofluid, and is convenient to regulate and control according to the installation space. The device disclosed by the invention adopts a corrugated structure inside, the cooling agent adopts xanthan gum-non-Newtonian nanofluid, and a vortex is generated inside when the working medium flows, so that the effect of heat exchange enhancement is achieved. The outside of the tube adopts a corrugated structure, so that the contact area is increased, and the heat exchange effect is enhanced. The novel fluid working medium in the pipe adopts xanthan gum-non-Newtonian nanofluid to enhance heat transfer. The inlet end of the new pipe is provided with the pulse pump, and the pulse pump superposes sinusoidal motion on the flow velocity of the working fluid to increase the disturbance inside the working fluid.
Drawings
Fig. 1 is a schematic structural diagram of a xanthan gum-nanofluid heat exchanger under a pulsating flow field according to the present invention;
FIG. 2 is a schematic diagram of the novel tube of the present invention;
FIG. 3 is a schematic diagram of the construction of the pulse pump of the present invention;
FIG. 4 is a schematic representation of xanthan gum of the present invention;
FIG. 5 is a schematic representation of a Cu-water nanofluid according to the present invention;
FIG. 6 is a schematic of Cu nanoparticles of the present invention with 6 xanthan polymer chains;
FIG. 7 is a graph of a xanthan gum-non-Newtonian nanofluid simulation of the present invention.
In the figure: 1. the device comprises an upper supporting frame, 2, a novel pipe, 3, a base, 4, a supporting frame, 5, temperature sensors II and 6, temperature sensors I and 7, a U-shaped elbow pipe, 8, a corrugated wall pipe, 9 and a pulse pump.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific embodiments:
as shown in fig. 1-3, a xanthan gum-non-newtonian nanofluid heat exchanger under a pulsating flow field comprises an upper support frame 1, a new pipe 2, a support frame 4, a base 3 and a pulsating pump 9, wherein the support frame 4 formed by two struts is installed on the base 3, the support frame 4 is positioned between the upper support frame 1 and the base 4, and the upper support frame 1 is fixedly connected with the support frame 4; the novel pipe 2 is arranged and fixed on the support frame 4 below the upper support frame 1, the whole height of the novel pipe 2 is smaller than that of the support frame 4, and the novel pipe 2 is formed by sequentially connecting 6 corrugated-wall pipes 8 and 5U-shaped elbow pipes 7 at intervals; temperature sensor I6 is located the inside of ripples wall pipe 8, temperature sensor II 5 is located the inside of U-shaped elbow 7, temperature sensor I6 and temperature sensor II 5 respectively through the wire with the power is connected. The xanthan gum-non-Newtonian nanofluid is located inside the new pipe 2; a pulsation pump 9 is fixed on the upper support frame 1, and the pulsation pump 9 is connected with the inlet of the new-shaped pipe 2.
Cooled fluid (hot fluid) flows through the corrugated wall pipe 8 and the U-shaped elbow pipe 7 of the novel pipe 2, the temperature sensors I6 and II 5 can monitor the fluid temperatures of different positions in the heat exchanger in real time, the heat value transfer is strengthened when the cooled fluid flows through the corrugated wall pipe 8, the maximization of the heat exchange effect is achieved, and the purpose of heat exchange is finally achieved.
The working principle of the invention is as follows:
the xanthan gum-nano fluid heat exchanger under the pulsating flow field is a periodical flow field caused by a pulsating pump 9 when a hot fluid flows through a corrugated wall pipe 8 on the heat exchanger, the disturbance of a working medium in the corrugated wall pipe 8 is enhanced, and the heat of the hot fluid is further absorbed by the strong heat exchange efficiency of the xanthan gum-non-Newtonian nano fluid in the heat exchanger so as to cool the hot fluid in the heat exchanger. Between the tubes arranged one above the other, they can be connected together by means of a U-shaped elbow 7.
Simulation of xanthan-non-newtonian nanofluids of the invention:
xanthan gum nanofluid consisting of 16nm3The box contained 18000 water molecules, two nanoparticles of Cu at radius 1nm, and 6 Xanthan polymer chains consisting of 8 Xanthan gum monomers, as shown in the table below:
the Xanthan gum (Xanthan gum) of the present invention is 6 Xanthan gum chains consisting of 8 Xanthan gum monomers, we obtained the Xanthan gum monomers using molecular dynamics modeling software and then polymerized them into polymer chains, and then arranged the 6 chains in an optimal arrangement using packmol modeling software, the packmol modeling code is as follows:
visualization software is then used to obtain the different structural simulation diagrams, as shown in fig. 4-7. The nanoparticles of the present invention are composed of two Cu atoms with a radius of 1nm and an atomic number of 250. Wherein the Cu atoms are arranged in the lattice constant of crystalline Cu, lattice (Cu) 3.615. As can be seen from fig. 4-7, the thermal conductivity of water at 298.15K is 0.6601W/m K, the error between the experimental value of 0.618W/m K (the experimental temperature of 303K) and the thermal conductivity of water is within 7%, the thermal conductivity of water is improved by more than 70% after the Cu nanoparticles with the mass fraction of 4.16% are added into the water, and the thermal conductivity of xanthan gum with the mass fraction of 11.64% is further improved.
The heat exchanger has simple structure, is easy to manufacture and maintain and is convenient for removing dirt. The pipe is changed into the corrugated wall pipe, the inside of the pipe adopts a corrugated structure, so that fluid generates vortex inside, the effect of heat exchange enhancement can be achieved, the outside adopts the corrugated structure, the contact area is increased, and the heat transfer is enhanced. The working medium in the tube is changed into non-Newtonian nano fluid to further achieve the effect of heat exchange and enhance refrigeration.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. A xanthan gum-non-Newtonian nanofluid heat exchanger under a pulsating flow field is characterized by comprising a novel pipe, an upper support frame, a base and a pulsating pump;
the support frame is arranged on the base, the support frame is positioned between the upper support frame and the base, and the upper support frame is fixedly connected with the support frame;
a new-shaped pipe is fixedly installed on the support frame and comprises a corrugated-wall pipe and a U-shaped elbow pipe, adjacent corrugated-wall pipes are fixedly connected through the U-shaped elbow pipe, the temperature sensor I is located inside the corrugated-wall pipe, and the temperature sensor II is located inside the U-shaped elbow pipe; the xanthan gum-non-Newtonian nanofluid is located inside the novel tube;
and a pulsation pump is fixed on the upper support frame and is connected with the inlet end of the new pipe.
2. The xanthan gum-non-newtonian nanofluid heat exchanger under a pulsating flow field of claim 1, wherein the xanthan gum-non-newtonian nanofluid is a xanthan gum non-newtonian water-based nanofluid containing Cu nanoparticles.
3. The xanthan gum-non-newtonian nanofluid heat exchanger according to claim 1, wherein the number of bellows tubes is greater than the number of U-elbows.
4. The xanthan gum-non-Newtonian nanofluid heat exchanger under a pulsating flow field according to claim 1, wherein the number of the bellows tubes is equal to the number of the temperature sensors I, and the number of the U-shaped elbows is equal to the number of the temperature sensors II.
5. The xanthan gum-non-Newtonian nanofluid heat exchanger under the pulsating flow field according to claim 1, 3 or 4, wherein the new pipe is formed by sequentially connecting N corrugated pipe pipes provided with a temperature sensor I and N-1U-shaped elbow pipes provided with a temperature sensor II at intervals, wherein N is a natural number greater than or equal to 2.
6. The xanthan gum-non-Newtonian nanofluid heat exchanger under a pulsating flow field according to claim 1, wherein the temperature sensor I and the temperature sensor II are respectively connected with the power supply through conducting wires.
7. The xanthan gum-non-newtonian nanofluid heat exchanger under a pulsating flow field of claim 1, wherein the overall height of the novel tubes is less than the height of the support shelf.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010890710.1A CN111964514A (en) | 2020-08-29 | 2020-08-29 | Xanthan gum-non-Newtonian nanofluid heat exchanger under pulsating flow field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010890710.1A CN111964514A (en) | 2020-08-29 | 2020-08-29 | Xanthan gum-non-Newtonian nanofluid heat exchanger under pulsating flow field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128120A (en) * | 2022-05-09 | 2022-09-30 | 天津大学 | Micro-scale enhanced heat transfer device utilizing viscoelastic fluid pulsating flow resonance effect |
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| KR20080096960A (en) * | 2007-04-30 | 2008-11-04 | 김용상 | A method for producing working fluid using non-metallic of nanometer-sized and working fluid thereby, heat pipe, apparatus for producing working fluid |
| CN101391183A (en) * | 2008-10-23 | 2009-03-25 | 上海交通大学 | Preparation method of copper oxide drag-reduction nano fluid |
| CN202928405U (en) * | 2012-11-20 | 2013-05-08 | 华南理工大学 | Heat exchanger for non-Newtonian fluid |
| CN103616404A (en) * | 2013-11-05 | 2014-03-05 | 西安交通大学 | Fluid flow heat-exchanging experimental device with ball socket/ball bulge flow control structure |
| CN111121496A (en) * | 2019-12-12 | 2020-05-08 | 燕山大学 | Vortex quantity reinforced nano fluid heat exchanger under pulsating flow field |
| CN111551069A (en) * | 2020-05-20 | 2020-08-18 | 山东大学 | Method, system and application for improving boiling heat exchange efficiency |
-
2020
- 2020-08-29 CN CN202010890710.1A patent/CN111964514A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080096960A (en) * | 2007-04-30 | 2008-11-04 | 김용상 | A method for producing working fluid using non-metallic of nanometer-sized and working fluid thereby, heat pipe, apparatus for producing working fluid |
| CN101391183A (en) * | 2008-10-23 | 2009-03-25 | 上海交通大学 | Preparation method of copper oxide drag-reduction nano fluid |
| CN202928405U (en) * | 2012-11-20 | 2013-05-08 | 华南理工大学 | Heat exchanger for non-Newtonian fluid |
| CN103616404A (en) * | 2013-11-05 | 2014-03-05 | 西安交通大学 | Fluid flow heat-exchanging experimental device with ball socket/ball bulge flow control structure |
| CN111121496A (en) * | 2019-12-12 | 2020-05-08 | 燕山大学 | Vortex quantity reinforced nano fluid heat exchanger under pulsating flow field |
| CN111551069A (en) * | 2020-05-20 | 2020-08-18 | 山东大学 | Method, system and application for improving boiling heat exchange efficiency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128120A (en) * | 2022-05-09 | 2022-09-30 | 天津大学 | Micro-scale enhanced heat transfer device utilizing viscoelastic fluid pulsating flow resonance effect |
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Application publication date: 20201120 |