CN114501937A - Magnetoni effect-based magnetic fluid self-circulation heat dissipation system and heat dissipation method - Google Patents
Magnetoni effect-based magnetic fluid self-circulation heat dissipation system and heat dissipation method Download PDFInfo
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- CN114501937A CN114501937A CN202210071959.9A CN202210071959A CN114501937A CN 114501937 A CN114501937 A CN 114501937A CN 202210071959 A CN202210071959 A CN 202210071959A CN 114501937 A CN114501937 A CN 114501937A
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- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 115
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 72
- 230000000694 effects Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 68
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052802 copper Inorganic materials 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 239000000919 ceramic Substances 0.000 claims abstract description 40
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 15
- 230000009471 action Effects 0.000 claims description 20
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical group [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 11
- 230000005347 demagnetization Effects 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical group [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011554 ferrofluid Substances 0.000 description 34
- 238000001816 cooling Methods 0.000 description 15
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- 230000005415 magnetization Effects 0.000 description 11
- 239000007788 liquid Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
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- 239000012530 fluid Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 230000007774 longterm Effects 0.000 description 2
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20272—Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds
Abstract
The invention belongs to the technical field of magnetofluid heat dissipation, and discloses a magnetofluid self-circulation heat dissipation system and a heat dissipation method based on the marangoni effect, wherein the heat dissipation system is provided with: a magnetic fluid; a copper substrate is arranged below the magnetic fluid; a plurality of magnets are laid below the copper substrate; a ceramic heating plate is arranged among the magnets; ceramic heating plates are used to provide a heat source. The invention has simple structure, easy operation and low equipment manufacturing difficulty; the oil-based magnetic fluid and the neodymium iron boron magnet are low in cost and easy to obtain. The invention only needs the magnet to form the magnetic fluid channel, and the ceramic heating sheet provides the heat source to enable the magnetic fluid to flow, thereby taking away the heat. The invention has wide application range, larger range of use temperature, wide application range and wide application prospect, and can be applied to different scenes in the largest range. The volume of the magnetic fluid is easy to adjust, the number of the magnets is easy to adjust, the magnetic fluid heat dissipation channels are easy to increase by adjusting the number of the magnets, the heat dissipation effect is enhanced, and the magnetic fluid heat dissipation device is very high in flexibility and good in maneuverability.
Description
Technical Field
The invention belongs to the technical field of magnetofluid heat dissipation, and particularly relates to a magnetofluid self-circulation heat dissipation system and a heat dissipation method based on the marangoni effect.
Background
At present, as electronic product performance is developed towards performance enhancement, volume lightening and miniaturization, integration level and assembly density are also continuously improved, so that power consumption and heat productivity are increased rapidly, and a heat dissipation technology is an important factor to be considered in electronic products. The method for enhancing heat transfer by using the nanofluid has a good effect and good practicability. The ferrofluid is a special type of nano fluid, and compared with the traditional cooling working medium (such as oil or water), the ferrofluid with magnetic nano particles lays a foundation for the application of the ferrofluid in the enhanced heat transfer due to the self flow characteristic, the temperature characteristic and the thermo-magnetic convection characteristic.
For the traditional magnetic fluid heat dissipation, the principle is mainly thermomagnetic convection. The magnetic fluid is affected by an external magnetic field, the temperature in the magnetic fluid is uneven, and the difference of the magnetization intensity at different positions can cause macroscopic pressure gradient to drive the fluid to move, which is the phenomenon of thermomagnetic convection. However, the magnetization intensity of the ordinary magnetic fluid changes little with the temperature, and the thermomagnetic convection is very weak. Therefore, the heat dissipation is carried out by utilizing the thermomagnetic convection, the temperature-sensitive magnetic fluid is required to be selected, the magnetic fluid has lower Curie temperature, the magnetization intensity of the magnetic fluid can be obviously changed by smaller temperature change, and the thermomagnetic convection phenomenon is very obvious. However, this also entails the problem that the temperature-sensitive magnetic fluid has a low working temperature, and the working range of the magnetic fluid is around the curie point.
Through the above analysis, the problems and defects of the prior art are as follows: the traditional heat dissipation device or heat dissipation system has high cost, the convection heat dissipation mode magnetic fluid has lower Curie point, lower use temperature and relatively narrow application range.
The difficulty in solving the above problems and defects is:
the traditional heat dissipation device or heat dissipation system is high in cost, the magnetic fluid Curie point is lower in the thermomagnetic convection heat dissipation mode, the use temperature is lower, and the application range is relatively narrow.
The significance of solving the problems and the defects is as follows:
the radiating system has simple structure and low cost, and is beneficial to large-scale popularization;
the magnetic fluid used by the scheme has a high Curie point, a high upper limit of the use temperature and a wide application range.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a magnetic fluid self-circulation heat dissipation system and a heat dissipation method based on the marangoni effect.
The invention is realized in this way, a magnetofluid self-circulation heat dissipation system based on marangoni effect is provided with:
a magnetic fluid;
a copper substrate is arranged below the magnetic fluid; a plurality of magnets are laid below the copper substrate;
a ceramic heating plate is arranged among the magnets; the ceramic heating plate is used for providing a heat source.
Further, the magnetic fluid is Fe3O4An oil-based magnetic fluid.
Furthermore, the copper substrate is made of pure copper.
Further, the magnet is a neodymium iron boron permanent magnet; the magnet is in a strip shape.
Further, the plurality of magnets form a magnetic fluid channel.
Further, the number of the magnets is 2 or more.
Further, the ceramic heating plate is an alumina ceramic heating plate; the ceramic heating plate can be glued with the copper substrate.
Further, a certain gap is reserved between the copper substrate and the magnet.
Furthermore, a certain gap is reserved between the ceramic heating sheet and the magnet.
Further, the ceramic heating plate may be another heat source.
The invention also aims to provide a magnetofluid self-circulation heat dissipation method based on the marangoni effect, which comprises the following steps: the magnetic fluid channel is formed by the neodymium iron boron permanent magnet laid under the copper substrate, the ceramic heating sheets provide a heat source, under the combined action of thermomagnetic convection and Marangoni effect, the magnetic fluid flows out from the heat source part due to the surface tension gradient and demagnetization, and is recycled from the low-temperature area under the action of magnet accumulation, so that a self-circulating heat dissipation system is formed.
The method specifically comprises the following steps: the ceramic heating sheet is electrified to increase the temperature, heat is transferred to the magnetic fluid from the heating sheet through the copper sheet, the magnetic fluid is heated to increase the temperature, the surface tension of the magnetic fluid is reduced, the temperature of the region far away from the ceramic heating sheet is low, the surface tension is high, and the magnetic fluid in the high-temperature region can be pulled to the low-temperature region; and because the temperature rises, the magnetic fluid in the high-temperature area is under the action of thermal demagnetization, and the magnetic fluid in the high-temperature area is also pulled to the low-temperature area; meanwhile, due to the rise of temperature, unbalanced magnetization is caused, the magnetization intensity of the part with higher temperature is lower, the magnetization intensity of the part with lower temperature is higher, Kelvin physical force can be applied to the part with higher temperature, and the ferrofluid is guided to flow by the Kelvin physical force. Under the combined action of the three components, a cycle which flows from the high-temperature region to the low-temperature region and returns from the low-temperature region to the high-temperature region is formed on the surface of the magnetic fluid below the liquid level of the magnetic fluid, so that a self-cycle of the magnetic fluid motion is formed and heat is taken away.
By combining all the technical schemes, the invention has the advantages and positive effects that:
the invention has simple structure, easy operation and low equipment manufacturing difficulty; the oil-based magnetic fluid and the neodymium iron boron magnet are low in cost and easy to obtain. The invention only needs the magnet to form the magnetic fluid channel, and the ceramic heating sheet provides the heat source to enable the magnetic fluid to flow, thereby taking away the heat.
The invention has wide application range, and the Fe selected by the invention3O4The oil-based magnetic fluid has very high Curie temperature (857K), a large use temperature range, wide application range and wide application prospect, and can be applied to different situations in the largest range. The volume of the magnetic fluid is easy to adjust, the number of the magnets is easy to adjust, the magnetic fluid heat dissipation channels are easy to increase by adjusting the number of the magnets, the heat dissipation effect is enhanced, and the magnetic fluid heat dissipation device is very high in flexibility and good in maneuverability.
According to the invention, as long as a heat source acts on the magnetic fluid, the magnetic fluid can continuously move due to temperature difference, so that liquid drops are pushed to move, no external driving device is needed, and the device has high stability and good reliability.
The invention has high heat dissipation efficiency, and compared with the traditional thermomagnetic convection heat dissipation, the Malagony heat dissipation effect is better. The invention does not need any external pushing device (such as an air pump and a mechanical pump), has the characteristics of simple structure, high heat dissipation efficiency, no noise, high reliability, good stability, low cost and the like, and has very wide application field and application prospect.
The invention has very simple structure, does not need any external device to push the magnetic fluid to flow, only needs the neodymium iron boron magnet to form a transport channel, and can generate Marangoni convection and thermomagnetic convection as long as the temperature gradient difference exists, so that the magnetic fluid flows to take away heat.
The invention can correspond to different heat dissipation situations by adjusting the shape and the size of the magnet and the amount of the magnetic fluid. When the heat is more, longer, wider and more magnets can be arranged, and more magnetic fluid is added to form a magnetic fluid channel, so that a better heat dissipation effect can be achieved.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic fluid self-circulation heat dissipation system based on the marangoni effect according to an embodiment of the present invention. (a) A front view; (b) and (4) a top view.
Fig. 2 is a schematic diagram showing temperature comparison of a heating plate provided by an embodiment of the present invention under 3 different heat dissipation mediums, with a heating power of 2.56W and cooling time of 30 s.
Fig. 3 is a schematic diagram showing temperature comparison of a heating plate provided by an embodiment of the present invention under 3 different heat dissipation mediums, with a heating power of 2.56W and a temperature controlled for 30 s.
Fig. 4 is a schematic diagram showing temperature comparison of the heating plate provided by the embodiment of the invention under 3 different heat dissipation media, with a heating power of 1W and after temperature stabilization.
Fig. 5 is a schematic view of a heat dissipation structure of magnetic fluid in a copper tube according to an embodiment of the present invention.
In the figure: 1. a magnetic fluid; 2. a copper substrate; 3. a magnet; 4. a ceramic heating sheet: 5. copper tubing.
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.
Aiming at the problems in the prior art, the invention provides a magnetofluid self-circulation heat dissipation system based on the marangoni effect, and the invention is described in detail with reference to the attached drawings.
As shown in fig. 1, the magnetic fluid self-circulation heat dissipation system based on marangoni effect provided by the embodiment of the present invention is provided with:
a magnetic fluid 1;
a copper substrate 2 is arranged below the magnetic fluid 1; a plurality of magnets 3 are laid below the copper substrate 2; a ceramic heating plate 4 is arranged among the magnets 3; the ceramic heating sheets 4 are used to provide a heat source.
The magnetic fluid 1 provided by the embodiment of the invention is Fe3O4An oil-based magnetic fluid.
The copper substrate 2 provided by the embodiment of the invention is made of pure copper.
The magnet 3 provided by the embodiment of the invention is a neodymium iron boron permanent magnet; the magnet 3 is in a strip shape.
The plurality of magnets provided by the embodiment of the invention form a magnetic fluid channel.
The number of the magnets provided by the embodiment of the invention is 2 or more than 2.
The ceramic heating plate 4 provided by the embodiment of the invention is an alumina ceramic heating plate; the ceramic heating plate 4 can be glued to the copper base plate 2.
A certain gap is reserved between the copper substrate 2 and the magnet 3.
A certain gap is reserved between the ceramic heating plate 4 and the magnet 3.
The ceramic heating plate 4 provided by the embodiment of the invention can be other heat sources.
The technical solution of the present invention is further described with reference to the following specific embodiments.
Example 1:
a magnetic fluid self-circulation heat dissipation system based on the Marangoni effect comprises the following contents: al (Al)2O3Ceramic heating plate, copper base plate, magnetic fluid, neodymium iron boron permanent magnet.
1. Magnetic fluid heat dissipation channel: 2 long-strip neodymium iron boron magnets with the length of 50 x 5 x 3mm provide a magnetic field, 200 mul of magnetic fluid is obtained for 2 times by using a liquid transfer gun, under the constraint of the magnetic field, the magnetic fluid forms 2 magnetic fluid channels with the length of 52mm, the width of 9mm and the thickness of 2.8mm (including magnetic fluid bulges), the magnetic fluid channels are distributed in a straight line shape, and the distance between the two magnets is 12 mm.
2. Heat source: the heating source is provided by alumina ceramic heating sheets, the size of the heating sheets is 10 x 2mm, the heating sheets are arranged between two magnets (or three magnets), and a certain gap is reserved between the heating sheets and the magnets. The heating plate is powered by the source meter, and can accurately output power.
3. The movement of the magnetic fluid is the combined action of thermomagnetic convection and the marangoni effect, the ceramic wafer generates heat, and the magnetic fluid flows out of the side of the ceramic wafer due to the surface tension gradient and demagnetization, and is recycled from a low-temperature area under the action of the magnetic force. In the invention, the magnetic fluid in the area near the heating ceramic chip is heated, the temperature is raised, the surface tension is low, the temperature of the magnetic fluid far away from the heating end is low, the surface tension is high, and the magnetic fluid rapidly flows from the hot end to the cold end. For thermo-magnetic convection, the main mechanism is that when the magnetic fluid is subjected to an external magnetic field and a thermal gradient, due to temperature difference induced unbalanced magnetization, the magnetization intensity of a part with higher temperature is lower, the part with lower temperature is higher, and Kelvin physical force can be applied to guide the ferrofluid to flow to the part with higher temperature. The magnetofluid at the low temperature flows to the high temperature due to the thermomagnetic convection, the thermomagnetic convection is promoted for the magnetofluid backflow under the interface, and the thermomagnetic convection and the marangoni backflow under the interface jointly form the magnetofluid backflow, so that a reciprocating cycle is finally formed.
4. The invention has very simple structure, only needs the ceramic heating sheet to provide a heat source, the neodymium iron boron magnet forms a transport channel, and the Marangoni convection and the thermomagnetic convection can be generated as long as the temperature gradient difference exists, so that the magnetofluid flows to take away the heat.
In the invention, magnetic fluid or 3 pieces of strip-shaped neodymium iron boron magnets with the length of 50 x 5 x 3mm provide a magnetic field, 600 mul of magnetic fluid is taken for 3 times by using a liquid transfer gun, and under the constraint of the magnetic field, the magnetic fluid forms 3 magnetic fluid channels (including magnetic fluid bulges) with the length of 52mm, the width of 9mm and the thickness of 2.8mm and is distributed in a delta shape.
In the invention, magnetic fluid or 4 long-strip neodymium iron boron magnets with the length of 50 x 5 x 3mm provide a magnetic field, a liquid transfer gun is used for taking 800 mul of magnetic fluid for 4 times, and under the constraint of the magnetic field, the magnetic fluid forms 4 magnetic fluid channels (comprising magnetic fluid bulges) with the length of 52mm, the width of 9mm and the thickness of 2.8mm, and the magnetic fluid channels are distributed in a cross shape.
In the present invention, the ferrofluid is the common commercially available oil-based ferrofluid (EFH 1) purchased from Ferrotec corporation. The temperature coefficient of the surface tension of the oil-based magnetofluid reaches 0.31 multiplied by 10-3Nm- 1K-1More than twice of pure water. High light absorption and large surface tension temperature coefficient can generate considerable surface tension gradient and push surface liquid to flow outwards. During the temperature increase, the viscosity of the ferrofluid rapidly decreases, making the marangoni convection stronger. The Marangoni coefficient is increased to 6.1 multiplied by 10 due to the comprehensive factors of high surface tension temperature coefficient, strong light absorption, low thermal diffusion coefficient, low viscosity and the like4With molten metal and NaNO3The Marangoni coefficients of the crystals are equally large.
In the invention, the copper substrate is used for separating the magnet from the magnetic fluid, so that the magnetic fluid is prevented from being directly adsorbed on the magnet. The copper substrate plays an alternate role, and meanwhile, the heat conductivity coefficient of pure copper is high, so that heat can be effectively conducted away.
In the invention, the ceramic heating plate is spaced from the magnet to prevent the magnet from being demagnetized by heating.
In step 1, the pure copper substrate should be spaced apart from the magnet, so as to prevent heat from being transferred to the magnet through the copper substrate, and the magnet is heated and demagnetized.
In the invention, the heat source can be various heat sources, and the magnetic fluid can move to take away heat as long as the temperature gradient difference exists.
Example 2:
two strip-shaped neodymium-iron-boron magnets with the size of 50 x 5 x 3mm are taken, the magnets are positioned below the copper substrate, a certain gap is reserved between the magnets and the copper substrate, a heating piece is adhered to the copper substrate by a heat-resistant double-sided adhesive tape manufactured by 3M company, and a certain distance is reserved between the heating piece and the magnets. And taking 300 mul of magnetic fluid twice by using a liquid transfer gun, dripping the magnetic fluid on a copper substrate above the magnet, and magnetizing and adsorbing the magnetic fluid on the copper substrate to form the strip-shaped magnetic fluid under the constraint of the strip-shaped magnet.
Opening a source meter, adjusting the output power to 1W, electrifying the ceramic heating sheet at the moment, increasing the temperature of the ceramic heating sheet, transferring heat to the magnetic fluid from the heating sheet through the copper sheet, increasing the heating temperature of the magnetic fluid, reducing the surface tension of the magnetic fluid, lowering the temperature of a region far away from the ceramic heating sheet, increasing the surface tension, and pulling the magnetic fluid in a high-temperature region to a low-temperature region; and because the temperature rises, the magnetic fluid in the high-temperature area is under the action of thermal demagnetization, and the magnetic fluid in the high-temperature area is also pulled to the low-temperature area; meanwhile, due to the rise of temperature, unbalanced magnetization is caused, the magnetization intensity of the part with higher temperature is lower, the magnetization intensity of the part with lower temperature is higher, Kelvin physical force can be applied to the part with higher temperature, and the ferrofluid is guided to flow to the part with higher temperature by the Kelvin physical force. Under the combined action of the three components, a cycle which flows from the high-temperature region to the low-temperature region and returns from the low-temperature region to the high-temperature region is formed on the surface of the magnetic fluid below the liquid level of the magnetic fluid, so that a self-cycle of the magnetic fluid motion is formed and heat is taken away.
Fig. 1 is a schematic diagram of a heat sink (3 magnetofluid channels) using a heating ceramic plate as a heat source and ferrofluid forming three strips on the copper plate above the magnetic rods. When the heating ceramic is turned on, the heat sink makes three cycles, due to marangoni convection and thermo-magnetic convection, transporting heat to the cold side. FIG. 2 shows the temperature of the heating plate when heat is dissipated at 100 ℃ for 30 s. Air natural cooling, kerosene (a solvent for ferrofluid) copper sheet heat dissipation and ferrofluid copper sheet heat dissipation are adopted. Compared with the cooling amplitudes of the copper sheet under the action of air and kerosene which are respectively 23.1 ℃ and 40.7 ℃, the cooling amplitudes of the ferrofluid on the copper sheet are respectively 47.7 ℃, and the cooling amplitudes of the ferrofluid on the copper sheet are respectively improved by about 106 percent and 17.2 percent compared with the cooling amplitudes of the copper sheet under the action of air and kerosene. Fig. 3 is a schematic temperature diagram of three different heat dissipation media with temperature controlled for 30 s. The ceramic chip temperature is measured from 60 ℃, and air natural cooling, kerosene (solvent of ferrofluid) copper sheet heat dissipation and ferrofluid copper sheet heat dissipation are adopted. Compared with the temperature control amplitude of the copper sheet under the action of air and kerosene, the temperature control effect of the ferrofluid on the copper sheet is the best, and the temperature control amplitude of the ferrofluid on the copper sheet is respectively improved by about 160% and 30% compared with the temperature control amplitude of the copper sheet under the action of air and kerosene.
This characteristic is also effective for temperature control of long-term operation devices, as shown in fig. 4. To demonstrate near-actual performance, 400 μ Ι _ of ferrofluid was encapsulated in Cu tubes (fig. 5) and tested with a 1W heat source. After a short temperature rise, the ferrofluid quickly stabilizes the temperature at 54.3 ℃, whereas the Cu in kerosene and air takes a longer time to maintain the temperature at 58.6 ℃ and 117 ℃. In conventional ferrofluid heat sinks, the low curie temperature near the operating range of the device is required, which limits the ferrofluid selection and cooling performance. Fe based on Marangoni effect and thermomagnetic convection3O4The ferrofluid heat sink can operate over a wide temperature range due to its high curie temperature. In addition, the ferrofluid partially filled tubes reduce coolant usage, providing additional driving force (surface tension gradient) for circulation, thereby improving temperature control performance.
The working principle of the invention is as follows:
the invention forms a magnetic fluid channel by the neodymium iron boron permanent magnet laid under the copper substrate, the ceramic heating sheet provides a heat source, under the combined action of thermomagnetic convection and Marangoni effect, the magnetic fluid flows out from the heat source part due to the surface tension gradient and demagnetization, and recycles back from the low temperature area under the action of magnet accumulation, thus forming a self-circulation heat dissipation system.
The positive effects of the present invention will be further described below with reference to specific experiments.
Fig. 2 to 4 show the performance characterization of the magnetic fluid heat dissipation. In these 3 different situations, the effect of the magnetic fluid heat dissipation is optimal.
FIG. 2 shows the temperature of the heating plate when heat is dissipated at 100 ℃ for 30 s. Air natural cooling, kerosene (a solvent for ferrofluid) copper sheet heat dissipation and ferrofluid copper sheet heat dissipation are adopted. Compared with the cooling amplitudes of the copper sheet under the action of air and kerosene which are respectively 23.1 ℃ and 40.7 ℃, the cooling amplitudes of the ferrofluid on the copper sheet are respectively 47.7 ℃, and the cooling amplitudes of the ferrofluid on the copper sheet are respectively improved by about 106 percent and 17.2 percent compared with the cooling amplitudes of the copper sheet under the action of air and kerosene.
Fig. 3 is a schematic temperature diagram of three different heat dissipation media with temperature controlled for 30 s. The ceramic chip temperature is measured from 60 ℃, and air natural cooling, kerosene (solvent of ferrofluid) copper sheet heat dissipation and ferrofluid copper sheet heat dissipation are adopted. Compared with the temperature control amplitude of the copper sheet under the action of air and kerosene, the temperature control effect of the ferrofluid on the copper sheet is the best, and the temperature control amplitude of the ferrofluid on the copper sheet is respectively improved by about 160% and 30% compared with the temperature control amplitude of the copper sheet under the action of air and kerosene.
FIG. 4 is a comparison of the temperature control capabilities of 3 different media in a long term operation device. 400 μ L of ferrofluid was encapsulated in copper tubing (FIG. 5) and tested with a 1W heat source. After a short temperature rise, the ferrofluid quickly stabilizes the temperature at 54.3 ℃, whereas the Cu in kerosene and air takes a longer time to maintain the temperature at 58.6 ℃ and 117 ℃.
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. The magnetic fluid self-circulation heat dissipation system based on the marangoni effect is characterized by comprising the following components in parts by weight:
a magnetic fluid;
a copper substrate is arranged below the magnetic fluid; a plurality of magnets are laid below the copper substrate;
a ceramic heating plate is arranged among the magnets; the ceramic heating plate is used for providing a heat source.
2. The magaint self-circulation heat dissipation system based on marangoni effect as claimed in claim 1, wherein the magnetic fluid is Fe3O4An oil-based magnetic fluid.
3. The magnetic fluid self-circulation heat dissipation system based on the marangoni effect as claimed in claim 1, wherein the copper substrate is made of pure copper.
4. The magaint self-circulation heat dissipation system based on the marangoni effect as claimed in claim 1, wherein the magnet is a neodymium iron boron permanent magnet; the magnet is in a strip shape.
5. The marangoni effect-based magnetofluid self-circulation heat dissipation system as recited in claim 1, wherein the plurality of magnets form magnetofluid channels.
6. The marangoni effect-based magnetofluidic self-circulation heat dissipation system as recited in claim 1, wherein the plurality of magnets is more than 2 magnets.
7. The magaint self-circulation heat dissipation system based on the marangoni effect as claimed in claim 1, wherein the ceramic heating sheet is an alumina ceramic heating sheet; and the ceramic heating sheet is glued with the copper substrate.
8. The marangoni effect-based magnetofluid self-circulation heat dissipation system as recited in claim 1, wherein a gap is reserved between the copper substrate and the magnet.
9. The magaint self-circulation heat dissipation system based on the marangoni effect as claimed in claim 1, wherein a gap is reserved between the ceramic heating sheet and the magnet.
10. The heat dissipation method for the magainy self-circulation heat dissipation system based on the marangoni effect according to any one of claims 1 to 9, wherein the method for the magainy self-circulation heat dissipation based on the marangoni effect comprises the following steps: the magnetic fluid channel is formed by the neodymium iron boron permanent magnet laid under the copper substrate, the ceramic heating sheets provide a heat source, under the combined action of thermomagnetic convection and Marangoni effect, the magnetic fluid flows out from the heat source part due to the surface tension gradient and demagnetization, and is recycled from the low-temperature area under the action of magnet accumulation, so that a self-circulating heat dissipation system is formed.
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