A heat dissipation device for gas-liquid mixed medium and its preparation method

Abstract

The present invention provides a heat dissipation device for use in a gas-liquid mixed medium and a preparation method thereof, belonging to the field of heat dissipation. The heat dissipation device includes: a heat dissipation plate and multiple supporting structures. One side of the heat dissipation plate in the vertical direction is in contact with a heat source; multiple supporting structures are provided on the side of the heat dissipation plate opposite to the heat source; the multiple supporting structures are evenly arranged in the horizontal direction of the heat dissipation plate, and the areas of the support structures in the horizontal direction are equal; the areas of the multiple supporting structures increase successively from top to bottom in the vertical direction; the heat dissipation plate, the supporting structure, and the heat source are all located in the gas-liquid mixed medium. By reasonably setting the position and size of the supporting structure, the heat dissipation area of ​​different regions can be accurately controlled, thereby improving the consistency of the pressure distribution of the heat dissipation device and the uniformity of heat dissipation.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation, and in particular to a heat dissipation device for use in a gas-liquid mixed medium and a preparation method thereof. Background Art

[0002] Fluorocarbons and other materials with excellent insulation properties, non-flammability, good chemical stability, and a low boiling point (40-70°C) can remove large amounts of heat during the phase change (liquid-to-gas) process, and therefore are used in hydro-turbine generators and computer cooling in big data centers. These materials, which utilize phase change heat transfer to cool devices, are generally referred to as phase change heat transfer media. Their application in high-voltage equipment heat dissipation is still immature, while HVDC transmission equipment such as converter valves has a significant demand for highly reliable heat dissipation systems. For example, deionized water cooling systems used for converter valve cooling often lead to insulation failure after leakage. Furthermore, water cooling systems have a large number of devices and complex control, which can increase the failure rate of converter valves.

[0003] The typical radiator is a pipe structure. The fundamental reason for this is that the radiator usually needs to enclose the heat dissipation medium in a fixed space and dissipate heat through heat conduction or convection. However, the radiator using phase change medium needs to have the following characteristics: (1) Close contact with the heat source. Only close contact can achieve heat conduction with low thermal resistance. (2) The pressure distribution on the contact surface is uniform under pressure. (3) The efficiency of phase change heat transfer is closely related to the contact area. Therefore, it is necessary to increase the contact area as much as possible to achieve good heat conduction between the radiator and the phase change heat medium. (4) In order to achieve uniform heat dissipation of the heat source, the temperature distribution on the radiator surface needs to be as close to uniform as possible. (5) After the phase change heat medium undergoes a liquid-gas phase change, if bubbles adhere to the radiator surface, the heat conduction efficiency will be significantly reduced. Therefore, the surface of the radiator needs to be less prone to bubble accumulation.

[0004] However, for radiators immersed in the converter valve, the existing solutions are contradictory or even mutually exclusive, making them difficult to apply directly. In particular, the need to withstand pressure makes it difficult to achieve other requirements, such as: (1) A large contact area with the liquid requires a thinner columnar or fin-shaped structure inside the radiator, but this structure is difficult to withstand large pressures and achieve close contact with the heat source for radiators under pressure. (2) The temperature distribution on the radiator surface must be as close as possible to the thermal resistance of different areas inside the radiator, which requires different heat dissipation areas in different areas, which brings difficulties to the design of uniform pressure. Summary of the Invention

[0005] The object of the present invention is to provide a heat dissipation device for use in a gas-liquid mixed medium and a preparation method thereof, which can improve the consistency of pressure distribution of the heat dissipation device and achieve uniform heat dissipation.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A heat dissipation device for a gas-liquid mixed medium, comprising: a heat dissipation plate and a plurality of supporting structures;

[0008] One side of the heat dissipation plate in a vertical direction is in contact with a heat source;

[0009] A plurality of supporting structures are provided on a side of the heat dissipation plate opposite to the heat source;

[0010] The plurality of support structures are evenly arranged in the horizontal direction of the heat dissipation plate, and the areas of the support structures in the horizontal direction are equal;

[0011] The areas of the multiple support structures increase in sequence from top to bottom in the vertical direction;

[0012] The heat dissipation plate, the supporting structure and the heat source are all located in a gas-liquid mixed medium.

[0013] Optionally, each supporting structure includes a table portion and a cylindrical portion;

[0014] The radius of the upper bottom surface of the table portion is smaller than the radius of the lower bottom surface;

[0015] The lower bottom surface of the table portion is arranged on the heat dissipation plate;

[0016] The bottom radius of the cylindrical portion is equal to the upper bottom radius of the spherical table portion;

[0017] A bottom surface of the cylindrical portion is fixed to the upper bottom surface of the table portion.

[0018] Optionally, the ratio of the lower base radius of the spherical table portion to the bottom radius of the cylindrical portion is:

[0019]

[0020] Among them, R is the bottom radius of the spherical table part, and r is the bottom radius of the cylindrical part.

[0021] Optionally, the area of ​​each support structure is determined by the bubble distribution rate of the gas-liquid mixed medium.

[0022] Optionally, the gas-liquid mixed medium is a phase-change heat medium.

[0023] To achieve the above object, the present invention also provides the following solution:

[0024] A method for preparing a heat dissipation device for use in a gas-liquid mixed medium, comprising:

[0025] Obtaining a first structural parameter; the structural parameter is used to define the area of ​​the support structure;

[0026] For the nth row area in the vertical direction of the heat sink, multiple support structures are prepared based on the nth structural parameters. <n;

[0027] The plurality of support structures are evenly arranged in the n-th row area in the vertical direction of the heat dissipation plate;

[0028] Determine the heat dissipation area of ​​the nth row region based on the nth structural parameter, the number of support structures in the nth row region, the horizontal length of the heat dissipation plate, and the distance between the support structures in the nth row region and the bottom of the heat dissipation plate;

[0029] Adjust the nth structural parameter to obtain the n+1th structural parameter so that the rate of change of the heat dissipation area of ​​the nth row region and the heat dissipation area of ​​the n+1th row region is within a set range, and the area of ​​each support structure in the n+1th row region is larger than the area of ​​each support structure in the nth row region;

[0030] Determine whether the distance between each support structure in the n+1th row and the bottom of the heat sink is less than a set threshold. If so, the heat dissipation device is completed. Otherwise, continue to prepare the support structure in the n+1th row.

[0031] Optionally, determining the heat dissipation area of ​​the n-th row region based on the n-th structural parameter, the number of support structures in the n-th row region, the horizontal length of the heat dissipation plate, and the distance between the support structures in the n-th row region and the bottom of the heat dissipation plate specifically includes:

[0032] Calculate the initial heat dissipation area of ​​the n-th row area based on the n-th structural parameters, the number of support structures in the n-th row area, and the horizontal length of the heat dissipation plate;

[0033] Determine the bubble distribution rate in the n-th row area based on the distance between the support structure in the n-th row area and the bottom of the heat sink;

[0034] The heat dissipation area of ​​the n-th row region is determined according to the initial heat dissipation area of ​​the n-th row region and the bubble distribution rate of the n-th row region.

[0035] Optionally, each supporting structure includes a spherical table portion and a cylindrical portion; the structural parameters include: the lower base radius of the spherical table portion, the bottom radius of the cylindrical portion, and the height of the cylindrical portion;

[0036] Use the following formula to calculate the initial heat dissipation area of ​​the nth row area:

[0037]

[0038] Among them, S row,n is the initial heat dissipation area of ​​the nth row area, N nis the number of support structures in the nth row area, R n is the bottom radius of the spherical table part of each supporting structure in the nth row area, r n h is the base radius of the cylindrical part of each support structure in the nth row area, n is the height of the cylindrical part of each supporting structure in the nth row area, and D is the horizontal length of the heat sink.

[0039] Optionally, the bubble distribution rate in the nth row area is determined using the following formula:

[0040] α bubble,n =k1+k2y n ;

[0041] Among them, α bubble,n is the bubble distribution rate in the nth row area, k1 and k2 are fitting coefficients, y n is the distance between the support structure in the nth row and the bottom of the heat sink.

[0042] Optionally, the heat dissipation area of ​​the nth row region is calculated using the following formula:

[0043] S' row,n =S row,n (1-α bubble,n );

[0044] Among them, S' ′row,n is the heat dissipation area of ​​the nth row area, S row,n is the initial heat dissipation area of ​​the nth row area, α bubble,n is the bubble distribution rate in the nth row area.

[0045] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the heat sink, the support structure and the heat source are all located in a gas-liquid mixed medium, one side of the heat sink in the vertical direction is in contact with the heat source, and a plurality of support structures are provided on the side of the heat sink opposite to the heat source; the plurality of support structures are evenly arranged in the horizontal direction of the heat sink, and the areas of the support structures in the horizontal direction are equal; the areas of the plurality of support structures increase successively from top to bottom in the vertical direction; the heat generated by the heat source causes the bubbles in the gas-liquid mixed medium to move vertically from bottom to top, and the number of bubbles at the bottom is small and the volume is large, while the number of bubbles at the top is large and the volume is small, so by reasonably setting the position and size of the support structure, the heat dissipation area of ​​different regions can be accurately grasped, thereby improving the consistency of the pressure distribution of the heat dissipation device and the uniformity of heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 Schematic diagram of a heat dissipation device for use in a gas-liquid mixed medium according to the present invention;

[0048] Figure 2 Schematic diagram of the positional relationship between the heat dissipation device and the heat source;

[0049] Figure 3 is a flow chart of a method for preparing a heat dissipation device;

[0050] Figure 4 This is a schematic diagram of the layout with an initial table radius of 0.01m;

[0051] Figure 5 This is a layout diagram with an initial table radius of 0.05m.

[0052] Explanation of symbols:

[0053] Heat sink-1, support structure-2, ball table part-21, cylindrical part-22, heat source-3. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] The purpose of the present invention is to provide a heat dissipation device for use in a gas-liquid mixed medium and a preparation method thereof. By reasonably setting the position and size of the support structure, the heat dissipation area of ​​different regions can be accurately controlled, thereby improving the consistency of the pressure distribution of the heat dissipation device and the uniformity of heat dissipation.

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Example 1

[0058] like Figure 1 and Figure 2As shown, the heat dissipation device for a gas-liquid mixed medium of the present invention comprises a heat dissipation plate 1 and a plurality of support structures 2. The heat dissipation plate 1, support structures 2, and heat source 3 are all located within the gas-liquid mixed medium. In this embodiment, the gas-liquid mixed medium is a phase-change heat medium.

[0059] One side of the heat sink 1 in the vertical direction is in contact with the heat source 3. That is, the heat source 3 is in close contact with the heat sink 1. In this embodiment, the heat source 3 is the main heat source inside the converter valve (power electronic devices such as thyristors or IGBTs).

[0060] A plurality of supporting structures 2 are provided on a side of the heat dissipation plate 1 opposite to the heat source 3 .

[0061] In this embodiment, the heat sink 1 is a cuboid, and the side in contact with the heat source 3 and the side on which the support structure 2 is provided may be rectangular or square.

[0062] The plurality of support structures 2 are evenly arranged in the horizontal direction of the heat dissipation plate 1, and the horizontal areas of the support structures 2 are equal. Preferably, the area of ​​each support structure 2 is determined by the bubble distribution rate of the gas-liquid mixed medium.

[0063] The areas of the plurality of support structures 2 increase in size from top to bottom in the vertical direction. The spacing between the support structures 2 in the vertical direction can be equal or unequal, depending on actual needs.

[0064] Specifically, each supporting structure 2 includes a spherical table portion 21 and a cylindrical portion 22 .

[0065] The radius of the upper bottom surface of the spherical table portion 21 is smaller than the radius of the lower bottom surface.

[0066] The lower bottom surface of the spherical table portion 21 is disposed on the heat dissipation plate 1 .

[0067] The bottom radius of the cylindrical portion 22 is equal to the upper bottom radius of the spherical table portion 21 .

[0068] A bottom surface of the cylindrical portion 22 is fixed to the upper bottom surface of the spherical table portion 21 .

[0069] The present invention adopts a combination of a spherical table and a cylindrical support structure 2 to improve the flatness of the heat sink surface. In addition, a thermal interface material with thermal conductivity can be coated to enable the heat sink 1 to be in close contact with the heat source 3.

[0070] In order to ensure uniform pressure on the contact surface between the heat sink and the heat source, the ratio of the bottom radius of the spherical portion 21 to the bottom radius of the cylindrical portion 22 is:

[0071]

[0072] Where R is the bottom radius of the spherical table, and r is the bottom radius of the cylindrical part. Generally, R=2r.

[0073] Furthermore, the thickness of the heat sink is composed of the thickness h1 of the heat sink 1, the height h of the cylindrical portion 22, and the height h of the spherical portion 21. The height h of the spherical portion 21 is calculated using the formula The thickness of the heat sink 1 can be determined based on actual conditions as long as it can withstand the pressure from both sides without deformation, and is generally 5 mm. The height of the cylindrical portion 22 can generally be 3-5 cm, which is related to the overall spatial design of the heat sink.

[0074] In this embodiment, by increasing the overall thickness of the heat dissipation device or increasing the number of supporting structures, the pressure distribution on the contact surface of the heat dissipation device is uniform when the heat dissipation device is under pressure.

[0075] The radiator used in the converter valve must withstand pressures of tens or even hundreds of kN, ensuring close contact between the heat source and the radiator while maximizing the contact area. However, if the pressure on the contact surface is uneven, both the contact area and consistent thermal resistance are difficult to maintain. Therefore, the present invention employs a spherical table plus cylindrical support structure to improve the consistency of pressure distribution. The area of ​​the spherical table is also designed based on the distribution of bubbles, ensuring that different areas of the heat sink have different heat dissipation areas, ensuring the most uniform temperature distribution possible on the surface of the heat sink.

[0076] As a specific embodiment, when there are multiple arranged heat sources 3, each pair of heat sinks constitutes a group. The support structures 2 of the two heat sinks are arranged opposite each other. That is, from left to right or from right to left, the order is first heat source, first heat sink, support structure on the first heat sink, support structure on the second heat sink, second heat sink, second heat source, third heat sink, support structure on the third heat sink, and so on.

[0077] In addition, the surface of the heat sink can be simplified by processing it into a honeycomb shape or adding fins and other flow-disturbing structures to prevent bubbles from accumulating. Microchannel structures can also be used to maximize the contact area with the liquid.

[0078] The change in the heat dissipation area of ​​each row of the heat dissipation device of the present invention is designed according to the temperature change gradient and the bubble content rate. The bubble content rate is taken into consideration when designing the heat dissipation area at different heights of the radiator, thereby improving the heat dissipation uniformity.

[0079] Example 2

[0080] This embodiment provides a method for preparing the heat dissipation device of embodiment 1.

[0081] like Figure 3As shown, the preparation method of the heat dissipation device for gas-liquid mixed medium provided in this embodiment includes:

[0082] S1: Obtain the first structural parameter. The structural parameter is used to define the area of ​​the support structure. Each support structure includes a spherical table portion and a cylindrical portion. The structural parameters include: the lower base radius of the spherical table portion, the bottom radius of the cylindrical portion, and the height of the cylindrical portion.

[0083] The lower bottom radius of the spherical table part in the first structural parameter needs to be designed and selected according to the heating power of the heat source. However, in actual applications, the process implementation is generally considered, and the lower bottom radius is reduced as much as possible to increase the heat dissipation area.

[0084] S2: For the nth row area in the vertical direction of the heat sink, prepare multiple support structures based on the nth structural parameters, 0 <n。

[0085] S3: multiple support structures are evenly arranged in the nth row area in the vertical direction of the heat dissipation plate.

[0086] S4: determining the heat dissipation area of ​​the nth row region according to the nth structural parameter, the number of support structures in the nth row region, the horizontal length of the heat dissipation plate, and the distance between the support structures in the nth row region and the bottom of the heat dissipation plate.

[0087] Specifically, (1) according to the nth structural parameter, the number of supporting structures in the nth row area, and the horizontal length of the heat sink, the following formula is used to calculate the initial heat dissipation area of ​​the nth row area:

[0088]

[0089] Among them, S row,n is the initial heat dissipation area of ​​the nth row area, N n is the number of support structures in the nth row area, R n is the bottom radius of the spherical table part of each supporting structure in the nth row area, r n h is the base radius of the cylindrical part of each support structure in the nth row area, n is the height of the cylindrical part of each supporting structure in the nth row area, and D is the horizontal length of the heat sink.

[0090] Furthermore, the present invention regards the square area of ​​the table, the cylindrical part, and the heat sink at the bottom of the table as a heat dissipation subdomain. The heat dissipation area of ​​each heat dissipation subdomain in the nth row area is: Therefore, the initial heat dissipation area of ​​each row region can be calculated according to the heat dissipation area of ​​each heat dissipation sub-domain.

[0091] (2) Based on the distance between the support structure and the bottom of the heat sink in the n-th row area, the bubble distribution rate in the n-th row area is determined using the following formula:

[0092] α bubble,n =k1+k2y n ;

[0093] Among them, α bubble,n is the bubble distribution rate in the nth row area, k1 and k2 are fitting coefficients, y n is the distance between the support structure in the nth row and the bottom of the heat sink.

[0094] Specifically, the distance between the support structure and the bottom of the heat dissipation plate is the distance from the center of the table portion to the bottom of the heat dissipation plate.

[0095] The present invention considers that bubbles generated after the liquid of the phase change heat medium boils adhere to the surface of the heat sink. Due to the presence of bubbles, the heat conduction from the heat sink to the liquid is blocked, resulting in the inability to achieve effective heat dissipation, thereby causing the temperature of the heat sink in the area with more bubbles to rise. At the same time, due to the combined effects of gravity, liquid dynamic viscosity, density, gas flow speed generated by the condenser and other factors, the bubbles move from the bottom to the top of the heat sink and break up during the movement, resulting in a phenomenon in which the number of bubbles at the bottom is small and the volume is large, while the number of bubbles at the top is large and the volume is small. This results in a large surface area of ​​the bubbles at the top, which has an adverse effect on heat conduction after attaching to the surface of the heat sink. In fact, due to the complex changes in bubbles under boiling conditions, they are closely related to the heat source heating power, the heat capacity of the phase change medium, the physical and chemical properties, etc. Therefore, there are large differences in the calculation formulas for different media and heating powers.

[0096] In this example, based on the distribution of bubbles at maximum heat source power, an approximate formula for the bubble distribution rate and the distance from the support structure to the bottom of the heat sink was established by taking the average area of ​​multiple photos taken at different times with the heating plate as the heat source. This test used a heating plate as the heat source, under boiling conditions, to take multiple photos at different times. The surface area of ​​bubbles in different regions of the photos was calculated, and the relationship between the bubble distribution rate and height (the distance from the support structure to the bottom of the heat sink) was obtained, thereby determining the fitting coefficients k1 and k2. Bubble distribution refers to the total area of ​​bubbles per unit area and is a dimensionless number.

[0097] (3) According to the initial heat dissipation area of ​​the n-th row area and the bubble distribution rate of the n-th row area, the heat dissipation area of ​​the n-th row area is determined using the following formula:

[0098] S' row,n =S row,n (1-α bubble,n );

[0099] Among them, S' row,n is the heat dissipation area of ​​the nth row area, S row,nis the initial heat dissipation area of ​​the nth row area, α bubble,n is the bubble distribution rate in the nth row area.

[0100] The present invention calculates the heat dissipation area after taking into account the bubble distribution rate of the phase change heat medium, with the goal of ensuring that the heat dissipation area of ​​each row area is as equal as possible, or the deviation is as small as possible.

[0101] S5: Adjust the nth structural parameter to obtain the n+1th structural parameter so that the rate of change of the heat dissipation area of ​​the nth row region and the heat dissipation area of ​​the n+1th row region are within a set range, and the area of ​​each supporting structure in the n+1th row region is larger than the area of ​​each supporting structure in the nth row region.

[0102] Specifically, the radius of the ball table portion is increased, step S4 is repeated to calculate the heat dissipation area of ​​the n+1th row region, and the change rate of the heat dissipation area of ​​the n+1th row region and the heat dissipation area of ​​the nth row region is controlled to be about 10%.

[0103] S6: Determine whether the distance between each support structure in the n+1th row area and the bottom of the heat sink is less than a set threshold. If so, the heat dissipation device is prepared; otherwise, continue preparing the support structure in the n+1th row area.

[0104] That is, when the calculated distance from the center of the spherical table portion in the (n+1)th row area to the bottom of the heat sink is less than the radius of the spherical table portion, the preparation is completed.

[0105] In order to better understand the solution of the present invention, a square heat dissipation device with a thickness of 0.025 m and a side length of D=0.25 m is taken as an example for further explanation.

[0106] Considering that the heat dissipation device does not deform under pressure, the thickness of the heat dissipation plate is h1 = 0.005m.

[0107] Considering the proportional relationship between the radius of the table and the radius of the cylinder, we take R = 2r. Then the height of the cylinder is

[0108] The heat dissipation area of ​​the heat dissipation subdomain is

[0109] Relationship between bubble distribution and height α bubble =0.06+0.062y.

[0110] Take the radius of the bottom surface of the top table R = 0.01m, and you can design Figure 4 Heat sink for the layout shown.

[0111] Take the radius of the bottom surface of the top table R = 0.02m, and you can design Figure 5 Heat sink for the layout shown.

[0112] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0113] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A heat dissipation device for gas-liquid mixed medium, characterized in that: The heat dissipation device for gas-liquid mixed medium includes: a heat dissipation plate and a plurality of supporting structures; One side of the heat dissipation plate in a vertical direction is in contact with a heat source; A plurality of supporting structures are provided on a side of the heat dissipation plate opposite to the heat source; The plurality of support structures are evenly arranged in the horizontal direction of the heat dissipation plate, and the areas of the support structures in the horizontal direction are equal; The areas of the multiple support structures increase in order from top to bottom in the vertical direction; the vertical direction is the direction of gravity; The heat sink, support structure and heat source are all located in a gas-liquid mixed medium; Each supporting structure includes a table portion and a cylindrical portion; The radius of the upper bottom surface of the table portion is smaller than the radius of the lower bottom surface; The lower bottom surface of the table portion is arranged on the heat dissipation plate; The bottom radius of the cylindrical portion is equal to the upper bottom radius of the spherical table portion; A bottom surface of the cylindrical portion is fixed to the upper bottom surface of the table portion; The proportional relationship between the lower base radius of the spherical table portion and the base radius of the cylindrical portion is: Among them, R is the bottom radius of the spherical table part, and r is the bottom radius of the cylindrical part.

2. The heat dissipation device for gas-liquid mixed medium according to claim 1, characterized in that: The area of ​​each supporting structure is determined by the bubble distribution rate of the gas-liquid mixed medium.

3. The heat dissipation device for gas-liquid mixed medium according to claim 1, characterized in that: The gas-liquid mixed medium is a phase-change heat medium.

4. A method for preparing a heat dissipation device for use in a gas-liquid mixed medium, for preparing the heat dissipation device for use in a gas-liquid mixed medium according to any one of claims 1 to 3, characterized in that: The preparation method comprises: Obtaining a first structural parameter; the structural parameter is used to define the area of ​​the support structure; For the nth row area in the vertical direction of the heat sink, multiple support structures are prepared based on the nth structural parameters. <n; The plurality of support structures are evenly arranged in the n-th row area in the vertical direction of the heat dissipation plate; Determine the heat dissipation area of ​​the nth row region based on the nth structural parameter, the number of support structures in the nth row region, the horizontal length of the heat dissipation plate, and the distance between the support structures in the nth row region and the bottom of the heat dissipation plate; Adjust the nth structural parameter to obtain the n+1th structural parameter so that the rate of change of the heat dissipation area of ​​the nth row region and the heat dissipation area of ​​the n+1th row region is within a set range, and the area of ​​each support structure in the n+1th row region is larger than the area of ​​each support structure in the nth row region; Determine whether the distance between each support structure in the n+1th row and the bottom of the heat sink is less than a set threshold. If so, the heat dissipation device is completed. Otherwise, continue to prepare the support structure in the n+1th row.

5. The method for preparing a heat dissipation device for use in a gas-liquid mixed medium according to claim 4, characterized in that: Determining the heat dissipation area of ​​the n-th row region based on the n-th structural parameter, the number of support structures in the n-th row region, the horizontal length of the heat dissipation plate, and the distance between the support structures in the n-th row region and the bottom of the heat dissipation plate specifically includes: Calculate the initial heat dissipation area of ​​the n-th row area based on the n-th structural parameters, the number of support structures in the n-th row area, and the horizontal length of the heat dissipation plate; Determine the bubble distribution rate in the n-th row area based on the distance between the support structure in the n-th row area and the bottom of the heat sink; The heat dissipation area of ​​the n-th row region is determined according to the initial heat dissipation area of ​​the n-th row region and the bubble distribution rate of the n-th row region.

6. The method for preparing a heat dissipation device for use in a gas-liquid mixed medium according to claim 5, characterized in that: Each supporting structure includes a table portion and a cylindrical portion; The structural parameters include: the bottom radius of the ball table part, the bottom radius of the cylindrical part and the height of the cylindrical part; Use the following formula to calculate the initial heat dissipation area of ​​the nth row area: Among them, S row,n is the initial heat dissipation area of ​​the nth row area, N n is the number of support structures in the nth row area, R n is the bottom radius of the spherical table part of each supporting structure in the nth row area, r n h is the base radius of the cylindrical part of each support structure in the nth row area, n is the height of the cylindrical part of each supporting structure in the nth row area, and D is the horizontal length of the heat sink.

7. The method for preparing a heat dissipation device for use in a gas-liquid mixed medium according to claim 5, characterized in that: The bubble distribution rate in the nth row area is determined using the following formula: a bubble,n =k1+k2y n ; Among them, α bubble,n is the bubble distribution rate in the nth row area, k1 and k2 are fitting coefficients, y n is the distance between the support structure in the nth row and the bottom of the heat sink.

8. The method for preparing a heat dissipation device for use in a gas-liquid mixed medium according to claim 5, characterized in that: Use the following formula to calculate the heat dissipation area of ​​the nth row area: S′ row,n =S row,n (1-ɑ bubble,n ); Among them, S′ row,n is the heat dissipation area of ​​the nth row area, S row,n is the initial heat dissipation area of ​​the nth row area, α bubble,n is the bubble distribution rate in the nth row area.

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