CN114838613A - Convection heat transfer method of magnetic field enhanced shell-and-tube heat exchanger - Google Patents
Convection heat transfer method of magnetic field enhanced shell-and-tube heat exchanger Download PDFInfo
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- CN114838613A CN114838613A CN202210549910.XA CN202210549910A CN114838613A CN 114838613 A CN114838613 A CN 114838613A CN 202210549910 A CN202210549910 A CN 202210549910A CN 114838613 A CN114838613 A CN 114838613A
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- tube heat
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- 238000012546 transfer Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012530 fluid Substances 0.000 claims description 31
- 239000002105 nanoparticle Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 2
- 239000011553 magnetic fluid Substances 0.000 abstract 1
- 239000002122 magnetic nanoparticle Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 20
- 238000005728 strengthening Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000006698 induction Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008092 positive effect Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
-
- 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
- C09K5/10—Liquid materials
-
- 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
- C09K5/14—Solid materials, e.g. powdery or granular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/16—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying an electrostatic field to the body of the heat-exchange medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F2013/001—Particular heat conductive materials, e.g. superconductive elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F2013/005—Thermal joints
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The invention belongs to the technical field of heat transfer enhancement of heat exchangers, and discloses a convection heat transfer method of a magnetic field enhanced shell-and-tube heat exchanger. Compared with a heat exchanger without adding magnetic nano particles and applying a magnetic field, the heat exchanger greatly improves the heat transfer rate under the condition of little influence on the pump power consumption, obviously enhances the comprehensive heat transfer performance, has certain advantages compared with other shell-and-tube heat exchangers, is easy to implement, does not need to add energy input equipment, and can be realized by using a magnetic fluid working medium in the shell-and-tube heat exchanger and placing a permanent magnet outside the shell-and-tube heat exchanger; on the basis of not changing the original structural design of the heat exchanger, the heat transfer rate can be greatly improved, the comprehensive heat transfer performance of the heat exchanger is improved, and the heat exchanger has popularization value.
Description
Technical Field
The invention belongs to the technical field of heat exchanger enhanced heat transfer, and particularly relates to a convection heat transfer method of a magnetic field enhanced shell-and-tube heat exchanger.
Background
At present, the heat transfer enhancement technology of the existing heat exchanger is divided into active enhancement and passive enhancement. The active strengthening is a strengthening mode needing to input external work, and mainly comprises surface vibration, an electric field, jet impact and the like; passive reinforcement starts with heat exchanger structures and working media, such as using special pipes, arranging turbulent flow structures, using rough surfaces, improving working media performance, and the like. The passive reinforcement technology is generally used at present, and the complex structure proposed by the passive reinforcement technology often has higher requirements on the manufacturing process of the heat exchanger, and uncertainty exists in the stability and durability of the use process. However, the shell-and-tube active strengthening technology is often difficult to use in the industrial process due to the complex equipment, high investment cost and vibration and noise, so it is necessary to provide a simple and efficient shell-and-tube heat exchanger active strengthening technology in order to make up for the shortage of the active strengthening technology in the industrial application and promote the active strengthening technology to generate practical benefits in the production process.
Through the above analysis, the problems and defects of the prior art are as follows:
the complex structure proposed by the passive strengthening technology often has higher requirements on the manufacturing process of the heat exchanger, and the stability and durability of the using process are uncertain.
The existing active strengthening mode of the heat exchanger is difficult to use in an industrial process because of complex equipment, high investment cost and vibration and noise.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a convection heat transfer method of a magnetic field enhanced shell-and-tube heat exchanger.
The invention is realized in this way, a convection heat transfer method of a magnetic field enhanced shell-and-tube heat exchanger comprises the following steps: magnetic nano fluid is used as working medium in the shell-and-tube heat exchanger, and a magnetic field is applied externally, so that the convective heat exchange rate of the shell-and-tube heat exchanger is correspondingly changed under the condition that the magnetic field changes the magnetic field of the magnetic nano fluid.
Furthermore, the shell-and-tube heat exchanger is made of 304 stainless steel materials and has the heat conductivity coefficient of 14.5 W.m -1 ·K -1 The relative permeability was 1.008.
Further, the magnetic nano fluid is made of Fe with the particle size of 20nm 3 O 4 Fe made of nanoparticles 3 O 4 Water magnetic nanofluid.
Further, said Fe 3 O 4 The preparation method of the water magnetic nano fluid comprises the following steps:
mixing Fe 3 O 4 The nanoparticles and the dispersant were added to deionized water and shaken for 1 hour using an ultrasonic shaker.
Further, said Fe 3 O 4 The addition ratio of the nanoparticles to the dispersant was 3: 1.
Further, the dispersing agent is sodium dodecyl benzene sulfonate.
Further, the magnetic field is applied by arranging a plurality of permanent magnets or electromagnets outside the heat exchanger.
Further, the applied magnetic field is a uniform magnetic field applied in a vertical direction.
In combination with the technical solutions and the technical problems to be solved, please analyze the advantages and positive effects of the technical solutions to be protected in the present invention from the following aspects:
first, aiming at the technical problems existing in the prior art and the difficulty in solving the problems, the technical problems to be solved by the technical scheme of the present invention are closely combined with results, data and the like in the research and development process, and some creative technical effects are brought after the problems are solved. The specific description is as follows:
compared with other active strengthening technologies of the shell-and-tube heat exchanger, the active strengthening technology is easier to implement, no energy input equipment is needed to be added, the magnetofluid working medium is used in the shell-and-tube heat exchanger, and the permanent magnet is placed outside the shell-and-tube heat exchanger.
The effect of the magnetic field on the fluid in the invention is embodied in enhancing the mixing degree of the cold and hot parts of the fluid and increasing the flow path of the fluid, but excessive flow resistance is not additionally added to the flow of the fluid, so that the power consumption of the pump is not obviously increased.
Compared with a heat exchanger without adding magnetic nano fluid and applying a magnetic field, the heat exchanger greatly improves the heat transfer rate and remarkably enhances the comprehensive heat transfer performance under the condition of little influence on the pump power consumption, and has certain advantages compared with other enhanced heat transfer methods of a shell-and-tube heat exchanger.
Secondly, considering the technical scheme as a whole or from the perspective of products, the technical effect and advantages of the technical scheme to be protected by the invention are specifically described as follows:
the technical scheme of the invention provides that the magnetic nano fluid is used as a working medium in the shell-and-tube heat exchanger, a magnetic field with parameters of a permanent magnet or an electromagnet is externally applied, and the convection heat exchange performance of the shell-and-tube heat exchanger is improved by depending on the influence of the magnetic field on the flowing and heat transfer characteristics of the magnetic nano fluid.
The secondary flow formed by the low-speed fluid with larger temperature gradient under the action of the magnetic field of the magnetic nano fluid in the shell-and-tube heat exchanger is the main reason for improving the convection heat exchange performance of the invention. This flow pattern accelerates the flow rate of the fluid in the low velocity region, disrupts the thermal boundary layer and increases the degree of mixing of the cold and hot fluids. The combined action of the temperature field, velocity field and magnetic field determines the magnitude and generation of the secondary flow.
Compared with other active strengthening technologies and passive strengthening technologies, the technical scheme of the invention is easy to realize, has less equipment investment and small technical difficulty, can greatly improve the heat transfer rate and the comprehensive heat transfer performance of the heat exchanger on the basis of not changing the original structural design of the heat exchanger, and has popularization value.
Third, as an inventive supplementary proof of the claims of the present invention, there are also presented several important aspects:
in the active strengthening heat transfer technology of the shell-and-tube heat exchanger which is proposed at present, magnetic nano fluid and a magnetic field are not tried to use, the technical scheme of the invention fills the blank of the active strengthening technology of the shell-and-tube heat exchanger at home and abroad, and has a certain application prospect for the industrial benefit of the shell-and-tube heat exchanger.
In the prior art, the enhanced heat transfer technology of the shell-and-tube heat exchanger is generally difficult to implement, more additional equipment investment and large technology and difficulty are provided, the technical scheme of the invention is simple and convenient, and provides a remarkable enhanced heat transfer effect on the basis of little influence on the flow resistance of the heat exchanger, thereby solving the problem that the equipment technology of the active enhancement technology is too complex to a great extent and overcoming the prejudice that the active enhancement technology is difficult to use in the practical application process.
Drawings
FIG. 1 is a schematic diagram of a shell-and-tube heat exchanger applying a magnetic field according to an embodiment of the present invention;
FIG. 2 is a graph of heat transfer rate and pressure drop versus flow rate for heat exchangers of different magnetic induction levels provided by an embodiment of the present invention;
FIG. 3 is a fluid flow diagram based on velocity change provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
First, an embodiment is explained. This section is an explanatory embodiment expanding on the claims so as to fully understand how the present invention is embodied by those skilled in the art.
As shown in fig. 1, in order to improve the flow heat transfer performance of the shell-and-tube heat exchanger, the magnetic nano-fluid is used as a working medium in the shell-and-tube heat exchanger and a magnetic field is applied externally, so that the convection heat transfer performance of the shell-and-tube heat exchanger is enhanced due to the influence of the magnetic field on the magnetic nano-fluid.
The shell-and-tube heat exchanger in the embodiment of the invention is made of 304 stainless steel, and has the heat conductivity coefficient of 14.5 W.m -1 ·K -1 The relative permeability was 1.008. The length of the heat exchanger is 1050mm, the inner diameter of the heat exchange pipe is 15mm, and the wall thickness is 0.5 mm. The working fluid is made of Fe with the particle size of 20nm 3 O 4 Fe made of nanoparticles 3 O 4 Water magnetic nanofluid.
Fe 3 O 4 The water magnetic nano fluid is prepared by a two-step method: mixing Fe at a ratio of 3: 1 3 O 4 The nano particles and the dispersant sodium dodecyl benzene sulfonate are added into deionized water, and then the mixture is vibrated for about one hour by using an ultrasonic oscillator. The magnetic field can be applied by arranging a plurality of permanent magnets or electromagnets outside the heat exchanger.
And II, application embodiment. In order to prove the creativity and the technical value of the technical scheme of the invention, the part is an application example of the technical scheme of the claims to a specific product or related technology.
In order to obtain the influence of the technical scheme of the invention on the flow and heat transfer performance of the shell-and-tube heat exchanger, the flow rate V on the shell pass is 3-6.5 m 3 The numerical simulation of the shell-and-tube heat exchanger shown in the figure 1 is carried out under the conditions that the tube pass flow velocity is 1.2m/s and the magnetic induction intensity B is 0-0.8T, and the simulation result shows that the embodiment of the invention achieves some positive effects in the research and development process and has great advantages compared with the prior art.
And thirdly, evidence of relevant effects of the embodiment. The embodiment of the invention achieves some positive effects in the process of research and development or use, and has great advantages compared with the prior art, and the following contents are described by combining data, diagrams and the like in the test process.
Fig. 2 (a) shows the variation of the heat transfer rate of the heat exchanger according to the present invention with the flow rate at different magnetic induction. As can be seen from the figure, the heat transfer rate of the heat exchanger is obviously improved under the action of the magnetic field. Fig. 2 (b) shows the inlet-outlet pressure drop of the heat exchanger according to the present invention with different magnetic induction intensity as a function of the flow rate. As can be seen from the graph, the magnetic field has no significant effect on the pressure drop across the heat exchanger.
FIG. 3 shows V-3 m 3 3% volume fraction Fe/h 3 O 4 And (3) a shell-side fluid flow diagram of the magnetic nano fluid under the conditions that the magnetic induction intensity B is 0T and B is 0.8T. As can be seen from fig. 3, under the action of the uniform magnetic field applied in the vertical direction, the low-speed fluid with a large temperature gradient flows from the low-temperature region to the high-temperature region, so that the mixing of the high-temperature fluid outside the fluid and the low-temperature fluid inside the fluid is enhanced, and the heat exchange is enhanced.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A convection heat transfer method of a magnetic field enhanced shell-and-tube heat exchanger is characterized by comprising the following steps: magnetic nano fluid is used as working medium in the shell-and-tube heat exchanger, and a magnetic field is applied externally, so that the convective heat exchange rate of the shell-and-tube heat exchanger is correspondingly changed under the condition that the magnetic field changes the magnetic field of the magnetic nano fluid.
2. The convection heat transfer method of the magnetic field enhanced shell-and-tube heat exchanger according to claim 1, wherein the magnetic nanofluid is Fe with a particle size of 20nm 3 O 4 Fe made of nanoparticles 3 O 4 Water magnetic nanofluid.
3. The method for convection heat transfer of a magnetic field enhanced shell and tube heat exchanger of claim 1, wherein the Fe is 3 O 4 Magnetic property of waterThe preparation method of the nano fluid comprises the following steps:
mixing Fe 3 O 4 The nanoparticles and the dispersant were added to deionized water and shaken for one hour using an ultrasonic shaker.
4. The method for convection heat transfer of a magnetic field enhanced shell and tube heat exchanger of claim 3, wherein the Fe 3 O 4 The addition ratio of the nanoparticles to the dispersant was 3: 1.
5. The method for convection heat transfer of a magnetic field enhanced shell and tube heat exchanger according to claim 3, wherein the dispersant is sodium dodecylbenzenesulfonate.
6. The method for enhancing the convective heat transfer of a shell-and-tube heat exchanger by a magnetic field according to claim 1, wherein the magnetic field is applied by arranging a plurality of permanent magnets or electromagnets outside the heat exchanger.
7. The method for convection heat transfer in a magnetic field enhanced shell and tube heat exchanger of claim 1, wherein the applied magnetic field is a uniform magnetic field applied in a vertical direction.
8. The method for convective heat transfer in a magnetic field enhanced shell and tube heat exchanger of claim 1 wherein the shell and tube heat exchanger is made of 304 stainless steel.
9. The method for convection heat transfer in a magnetic field enhanced shell and tube heat exchanger of claim 1, wherein the shell and tube heat exchanger has a thermal conductivity of 14.5 w.m -1 ·K -1 。
10. The method for convection heat transfer in a magnetic field enhanced shell and tube heat exchanger of claim 1, wherein the relative permeability of the shell and tube heat exchanger is 1.008.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210549910.XA CN114838613A (en) | 2022-05-20 | 2022-05-20 | Convection heat transfer method of magnetic field enhanced shell-and-tube heat exchanger |
| NL2032100A NL2032100A (en) | 2022-05-20 | 2022-06-08 | Magnetic field intensified convective heat transfer method of shell-and-tube heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210549910.XA CN114838613A (en) | 2022-05-20 | 2022-05-20 | Convection heat transfer method of magnetic field enhanced shell-and-tube heat exchanger |
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| Publication Number | Publication Date |
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| CN114838613A true CN114838613A (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210549910.XA Pending CN114838613A (en) | 2022-05-20 | 2022-05-20 | Convection heat transfer method of magnetic field enhanced shell-and-tube heat exchanger |
Country Status (2)
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| CN (1) | CN114838613A (en) |
| NL (1) | NL2032100A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070039721A1 (en) * | 2005-06-09 | 2007-02-22 | Murray Mark M | System and method for convective heat transfer utilizing a particulate solution in a time varying field |
| US20070068655A1 (en) * | 2005-09-29 | 2007-03-29 | Hon Hai Precision Industry Co., Ltd. | Heat transfer device |
| CN101681707A (en) * | 2007-12-27 | 2010-03-24 | 真空熔焠有限两合公司 | Composite article with magnetocalorically active material and method for its production |
| CN106497468A (en) * | 2016-09-09 | 2017-03-15 | 南京林业大学 | High heat conducting nano fluid adhesive, preparation method and its application in Wood-based Panel Production |
| CN208751358U (en) * | 2018-07-23 | 2019-04-16 | 山东理工大学 | A kind of heat-exchanger rig of phase boundary surface strengthening convective heat transfer |
| JP2019132542A (en) * | 2018-01-31 | 2019-08-08 | 株式会社豊田中央研究所 | Convection heat transfer acceleration method |
| CN112309669A (en) * | 2019-07-31 | 2021-02-02 | 北京化工大学 | Preparation method of water-based nano magnetic fluid |
| CN113587454A (en) * | 2021-08-18 | 2021-11-02 | 河海大学 | Magnetic field regulation and control solar heat collection device |
-
2022
- 2022-05-20 CN CN202210549910.XA patent/CN114838613A/en active Pending
- 2022-06-08 NL NL2032100A patent/NL2032100A/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070039721A1 (en) * | 2005-06-09 | 2007-02-22 | Murray Mark M | System and method for convective heat transfer utilizing a particulate solution in a time varying field |
| US20070068655A1 (en) * | 2005-09-29 | 2007-03-29 | Hon Hai Precision Industry Co., Ltd. | Heat transfer device |
| CN101681707A (en) * | 2007-12-27 | 2010-03-24 | 真空熔焠有限两合公司 | Composite article with magnetocalorically active material and method for its production |
| CN106497468A (en) * | 2016-09-09 | 2017-03-15 | 南京林业大学 | High heat conducting nano fluid adhesive, preparation method and its application in Wood-based Panel Production |
| JP2019132542A (en) * | 2018-01-31 | 2019-08-08 | 株式会社豊田中央研究所 | Convection heat transfer acceleration method |
| CN208751358U (en) * | 2018-07-23 | 2019-04-16 | 山东理工大学 | A kind of heat-exchanger rig of phase boundary surface strengthening convective heat transfer |
| CN112309669A (en) * | 2019-07-31 | 2021-02-02 | 北京化工大学 | Preparation method of water-based nano magnetic fluid |
| CN113587454A (en) * | 2021-08-18 | 2021-11-02 | 河海大学 | Magnetic field regulation and control solar heat collection device |
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| Publication number | Publication date |
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| NL2032100A (en) | 2023-11-27 |
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