Bionic sharkskin tooth fin liquid cooling heat dissipation device and optimization method thereof

Abstract

The invention discloses a bionic sharkskin tooth fin liquid cooling heat dissipation device and an optimization method thereof. The bionic sharkskin tooth fin liquid cooling heat dissipation device comprises a shell, and a heat exchange working medium is introduced into the shell; a plurality of bionic sharkskin tooth fins are arranged on the inner wall surface of the shell, and each bionic sharkskin tooth fin comprises a stem part, a middle ridge and a side ridge; the stem part is gradually heightened in the fluid flowing direction, the middle ridge is located in the middle of the stem part, and the two side ridges are symmetrically distributed on the two sides of the middle ridge; and the middle ridge and the side ridges extend from the incident flow surface of the stem part to the tail part of the stem part and are streamlined. The bionic sharkskin tooth fins are arranged in the liquid cooling heat dissipation device, and heat transfer in the liquid cooling heat dissipation device can be enhanced and pressure drop can be reduced by means of the bionic sharkskin tooth fins.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation devices, and in particular relates to a bionic shark skin tooth fin liquid cooling heat dissipation device and an optimization method thereof. Background Art

[0002] In recent years, as new energy vehicles (electric vehicles) gradually replace traditional fuel vehicles and become the main development direction of future vehicles, the power performance and cruising range of new energy vehicles have also improved, which makes it difficult for lithium batteries to maintain the optimal operating temperature range of 20-40°C during vehicle use. In order to improve the safety and performance of new energy vehicles, higher and higher requirements are placed on the battery thermal management system.

[0003] At present, liquid cooling is the most mainstream battery thermal management system mode. The coolant is used to absorb and take away the heat generated by the battery. In addition to being applied to battery thermal management, it can also be applied to other high-heat-generating power devices. Compared with cooling methods such as air cooling and phase change, liquid cooling has excellent heat dissipation performance. However, considering safety issues such as sealing and short circuit, liquid cooling generally adopts indirect liquid cooling; for example, the Chinese invention patent with application number 201811377555.2 discloses a slanted fin liquid cooling heat dissipation device, which has a shell, a liquid inlet, a liquid outlet and two rows of slanted fins along the front and rear directions. The slanted fins have the same spacing, are arranged symmetrically along the center, and have a parallelogram cross-section and are of the same size. Using liquid cooling heat dissipation technology, when the liquid flows in the heat dissipation device, it enters the secondary flow channel between the slanted fins from the main flow channel. The diversion of the liquid can destroy the flow boundary layer in the main flow channel to achieve the effect of enhancing heat exchange. In addition, the fluid in the secondary flow channel converges into the main flow channel and can impact the flow boundary layer again to enhance heat exchange. Increasing the arrangement of the secondary flow channels also increases the heat exchange area between the device and the fluid, improves the heat dissipation, and has a better heat dissipation effect.

[0004] In summary, indirect liquid cooling has shortcomings such as large pressure loss of the channel liquid cooling plate and limited heat dissipation performance during operation, and cannot balance the contradiction between pressure and heat dissipation.

[0005] Therefore, more attention needs to be focused on researching fin-type liquid cooling plates with lower pressure loss and better heat dissipation performance. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present application proposes a bionic shark skin tooth fin liquid cooling heat dissipation device and an optimization method thereof, wherein bionic shark skin tooth fins are arranged in the liquid cooling heat dissipation device, and the bionic shark skin tooth fins can be used to enhance heat transfer and reduce pressure drop in the liquid cooling heat dissipation device.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A bionic shark skin tooth fin liquid cooling device, comprising:

[0009] a shell, wherein a heat exchange medium is passed into the shell;

[0010] A plurality of bionic shark skin tooth fins are arranged on the inner wall surface of the shell, and the bionic shark skin tooth fins include a stem, a middle ridge, and side ridges; the stem gradually increases in height along the direction of fluid flow, the middle ridge is located in the middle position of the stem, and two side ridges are symmetrically distributed on both sides of the middle ridge; the middle ridge and the side ridges extend from the flow-facing surface of the stem to the tail of the stem and are streamlined.

[0011] Furthermore, the two side surfaces of the middle ridge are concave smooth curved surfaces, the bottom edge lines of the two curved surfaces are connected to the upper surface of the stem, and the connection is smoothly transitioned.

[0012] Furthermore, the side ridge includes an inner curved surface and an outer curved surface. The outer curved surface of the side ridge is a convex smooth curved surface, the bottom of which coincides with the edge line of the stem, and the connection has a smooth transition; the inner curved surface of the side ridge is a concave smooth curved surface, the bottom of which is connected to the upper surface of the stem, and the connection has a smooth transition.

[0013] Furthermore, the bottom edge line of the inner curved surface of the side ridge does not intersect with the bottom edge line of the middle ridge on the same side, and an intermediate flow channel is formed on the upper surface of the stem, and the width of the intermediate flow channel gradually decreases along the fluid flow direction.

[0014] Furthermore, the chord length of the side ridge is expressed as Ls, the chord length of the middle ridge is expressed as Lm, and the chord length ratio of the side ridge to the middle ridge is 0.8-1.2.

[0015] Furthermore, the chord length Lm of the middle ridge is equal to the span length L of the outer ridge.

[0016] Furthermore, the height of the side ridge is denoted as H s , the height of the middle ridge is denoted as H m The height ratio of the side ridges to the middle ridges is 0.75-1.

[0017] Furthermore, the slope of the stem is an incident angle θ, and the incident angle θ is 5°-20°.

[0018] Furthermore, the bionic shark skin tooth fins are arranged in an array with equal spacing or variable spacing on the inner wall surface of the shell.

[0019] A method for optimizing a bionic shark skin tooth fin liquid cooling device, characterized in that it comprises the following steps:

[0020] S1. Construct a physical model of the bionic shark skin tooth fin liquid cooling device according to claim 1;

[0021] S2, select the comprehensive evaluation index TP as the response target;

[0022] S3, taking the structural parameters of the bionic shark skin tooth fin as control factors, selecting multiple different level numbers for each control factor; the selected structural parameters include the incident angle, the chord length ratio of the middle ridge and the side ridge Lm:Ls, and the height ratio of the middle ridge and the side ridge Hm:Hs;

[0023] S4. Generate several groups of orthogonal test schemes based on the control factors, the number of levels corresponding to each control factor, and the comprehensive evaluation index TP.

[0024] S5. For each set of orthogonal experimental schemes, a physical model of the bionic shark skin tooth fin is established;

[0025] S6, numerically simulate all the physical models established in S5 to obtain a comprehensive evaluation index TP of each model;

[0026] S7. Perform signal-to-noise ratio analysis and variance analysis on the simulation results of each model, and determine the influence of each control factor on the comprehensive performance;

[0027] S8. The bionic shark skin tooth fin is structurally optimized through analysis results to obtain the optimal structural parameters.

[0028] Beneficial effects of the present invention:

[0029] (1) A bionic shark skin tooth fin liquid cooling device is invented and designed. Since the bionic shark skin tooth fin is streamlined in shape, it can effectively reduce resistance and thus reduce the possibility of boundary layer separation, which can be beneficial to enhancing heat transfer and reducing pressure drop.

[0030] (2) The design of the stem structure in the bionic shark skin tooth fin can extract heat from the main heat transfer surface of the liquid cooling plate.

[0031] (3) The structural design of the ridges on the upper surface of the bionic shark skin tooth fin can further increase the streamline by guiding the fluid flow on the top surface, thereby improving the contact area between the top of the bionic shark skin tooth fin and the flowing fluid to enhance heat transfer.

[0032] (4) The present invention optimizes the structure of the bionic shark skin tooth fin based on the Taguchi method, taking into account the heat transfer and resistance factors of the radiator, taking the comprehensive performance of the radiator as the optimization index, optimizing the structural parameters of the bionic shark skin tooth fin, and improving the comprehensive performance of the radiator. This optimization design method can effectively shorten the design cycle of the bionic shark skin tooth, reduce the development cost, and improve the comprehensive performance of the radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1This is a front view of a bionic shark skin tooth fin liquid cooling heat dissipation device of the present invention.

[0034] Figure 2 This is a top view of a bionic shark skin tooth fin liquid cooling heat dissipation device of the present invention.

[0035] Figure 3 It is a three-dimensional schematic diagram of a bionic shark skin tooth fin liquid cooling heat dissipation device of the present invention.

[0036] Figure 4 This is an axial view of a bionic shark skin tooth fin of a bionic shark skin tooth fin liquid cooling heat dissipation device of the present invention.

[0037] Figure 5 This is a front view of the bionic shark skin tooth fin of a bionic shark skin tooth fin liquid cooling and heat dissipation device of the present invention.

[0038] Figure 6 A side view of a bionic shark skin tooth fin of a bionic shark skin tooth fin liquid cooling heat dissipation device of the present invention.

[0039] Figure 7 A top view of the bionic shark skin tooth fins of a bionic shark skin tooth fin liquid cooling heat dissipation device of the present invention.

[0040] Figure 8 This is a flow chart for optimizing the bionic shark skin tooth fin structure of the present invention.

[0041] Fig. 9 This is the main effect diagram of the signal-to-noise ratio of the present invention.

[0042] Fig.10 The simulation results of two optimized designs and conventional straight channel liquid cooling radiators.

[0043] Among them, 1. shell, 2. liquid inlet, 3. liquid outlet, 4. bionic shark skin tooth fin, 5. stem, 6. middle ridge, 7. side ridge, 8. middle flow channel. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] It should be noted that the embodiments provided by the present invention are only for effective explanation of the technical features of the invention. The positioning words such as the front end, rear end, both sides, and top are only for better description of the embodiments of the present invention and cannot be regarded as limitations on the technical solution of the present invention.

[0046] Example 1

[0047] A bionic shark skin tooth fin liquid cooling device, the structure of which is as follows Figure 1 , 2 , 3, comprises a shell 1, the shell 1 is a closed structure with a hollow interior; a liquid inlet 2 and a liquid outlet 3 are arranged on the shell 1, and a heat exchange medium is input into the shell 1 through the liquid inlet 2, and then the heat exchange medium is discharged from the liquid outlet 3. In the present application, the liquid inlet 2 and the liquid outlet 3 are rectangular in shape and are symmetrically arranged on two sides of the shell 1.

[0048] A plurality of bionic shark skin tooth fins 4 are arranged on the inner wall surface of the housing 1. The bionic shark skin tooth fins 4 can not only enhance the heat exchange effect between the housing 1 and the heat exchange medium, but also achieve the dual effect of reducing the resistance in the housing 1. The structure of the bionic shark skin tooth fins 4 is as follows: Figure 4-7 As shown, the bionic shark skin tooth fin 4 is in the shape of a "mountain" as a whole, including a stem 5, a middle ridge 6, and a side ridge 7, wherein the stem 5 gradually increases in height along the fluid flow direction, and the slope of the stem 5 is named as the incident angle θ taking 5°-20°.

[0049] The upper surface of the stem 5 is provided with a middle ridge 6 and two side ridges 7. The middle ridge 6 is located in the middle of the stem 5, and the two side surfaces of the middle ridge 6 are concave smooth curved surfaces, the bottom edge lines of the two curved surfaces are connected to the upper surface of the stem 5, and the connection is smoothly transitioned; the top edge lines of the two curved surfaces intersect to form a middle ridge streamline, and the middle ridge streamline extends from the flow-facing surface of the stem 5 to the tail of the stem 5, and the middle ridge streamline is streamlined as a whole.

[0050] Two side ridges 7 are symmetrically distributed on both sides of the middle ridge 6. The side ridges 7 include an inner curved surface and an outer curved surface. The outer curved surface of the side ridge 7 is a convex smooth curved surface, and its bottom coincides with the edge line of the stem 5, and the connection is smooth. The inner curved surface of the side ridge 7 is a concave smooth curved surface, and its bottom is connected to the upper surface of the stem 5, and the connection is smooth. The top edge lines of the inner curved surface and the outer curved surface intersect to form a side ridge streamline, which extends from the frontal surface of the stem 5 to the tail of the stem 5, and the side ridge streamline is streamlined as a whole.

[0051] The bottom edge line of the inner curved surface of the side ridge and the bottom edge line of the middle ridge 6 on the same side are separated by a certain width to form a middle flow channel 8; the middle flow channel 8 is located on the upper surface of the stem 5. In order to ensure the stability of fluid flow, the middle flow channel 8 is smoothly connected with the inner curved surface of the side ridge 7 and the curved surface of the middle ridge 6 on both sides.

[0052] In this embodiment, the chord length Lm of the middle ridge is equal to the span length L of the outer ridge.

[0053] In this embodiment, combined with the attached Figure 7 The chord length of the side ridge is expressed as Ls, the chord length of the middle ridge is Lm, and the chord length ratio of the side ridge and the middle ridge is adjusted between 0.8-1.2.

[0054] In this embodiment, combined with the attached Figure 6 , the height of the side ridge is denoted as H s , the height of the middle ridge is denoted as H m , the height ratio of the side ridges and the middle ridges is adjusted between 0.75-1.

[0055] In this embodiment, the width of the middle channel 8 gradually decreases along the fluid flow direction. For example, the width of the middle channel 8 at the inlet side is b1, and the width at the outlet side can be b2, and b1:b2 is 2:1. The advantage of designing the middle channel 8 (compared to directly connecting the bottom of the middle ridge and the outer ridge) is that it can smoothly transition and avoid the situation of abrupt changes in speed.

[0056] In this embodiment, the shell 1 and the bionic shark skin tooth fin 4 are made of aluminum materials such as aluminum alloy, which have good corrosion resistance and oxidation resistance, and can also greatly reduce the mass of the cold plate and increase the energy density of the battery pack. Or other materials with good thermal conductivity to meet the heat exchange size of the specific battery pack.

[0057] In this embodiment, the bionic shark skin tooth fins 4 are arranged at equal intervals on the inner wall surface of the housing 1 , that is, the intervals between each column and each row are the same.

[0058] In this embodiment, the bionic shark skin tooth fins 4 are arranged at variable intervals on the inner wall surface of the housing 1 , that is, they are arranged at equal intervals in each row, and the intervals between adjacent rows gradually widen along the fluid flow direction.

[0059] In this embodiment, the bionic shark skin tooth fins 4 can be arranged in an array on the inner wall surface of the housing 1, or can be arranged in a staggered manner between front and rear rows.

[0060] During the heat exchange process, the heat source end contacts the outer surface of the shell 1, and the shell 1 acts as a heat conduction medium to transfer heat to the heat exchange medium inside. When the heat exchange medium enters the shell 1 through the liquid inlet 2, it will be diverted by the middle ridge 6 and the side ridge 7 when passing through the bionic shark skin tooth fin 4, and divided into four, respectively to the sides of the side ridge 7 and the sides of the middle ridge 6. Each bionic shark skin tooth fin 4 will divert the heat exchange medium, and the fluid will eventually flow out of the device outlet 3. During the fluid flow process, the shell 1 contacts the stem structure 5 of the bionic shark skin tooth fin for heat exchange, thereby bringing the heat out of the liquid outlet 3. The bionic shark skin tooth fin 4 has the dual functions of heat exchange and drag reduction in the device.

[0061] Example 2

[0062] In order to optimize the performance of the above-mentioned bionic shark skin tooth fin liquid cooling device, the present invention optimizes the fin structure based on the Taguchi method and combines the attached Figure 8-10 , the specific steps of the present invention are as follows:

[0063] S1. A physical model of a bionic shark skin tooth fin 4 is established based on a bionic shark skin tooth fin liquid cooling device designed in Example 1;

[0064] S2. Considering the influence of heat transfer and resistance of liquid cooling radiator, the comprehensive evaluation index TP is selected as the response target; the comprehensive evaluation index is expressed as

[0065] TP=Nu / f 1 / 3

[0066] Where Nu is the average Nusselt coefficient and f is the average friction coefficient.

[0067] S3. According to the designed bionic shark skin tooth fin 4 structure, the structural parameters of the bionic shark skin tooth fin 4 are selected as control factors, and multiple different levels are selected according to the control factors. In this application, the incident angle (θ), the chord length ratio of the middle ridge and the side ridge (Lm: Ls), and the height ratio of the middle ridge and the side ridge (Hm: Hs) are selected as control factors respectively; combined with the size structure of the shark bionic shark skin tooth fin 4, the optimization range of each control factor is determined, thereby determining the level value of each control factor. This application only sets 3 different levels, as shown in Table 1 below.

[0068] Table 1 is the factor level table of orthogonal test method

[0069] factor Level 1 Level 2 Level 3 θ 5 10 15 Lm: Ls 1.3 1.4 1.5 Hm:Hs 1.2 1.3 1.4

[0070] S4. Input the orthogonal test factor level table into Minitab to obtain the orthogonal test plan: Establish L93 3 Orthogonal test table, each group in the orthogonal test table is an orthogonal test scheme, and the orthogonal test table is shown in Table 2;

[0071] Table 2 is the orthogonal test table

[0072] Serial number θ Lm: Ls Hm:Hs TP 1 5 1.3 1.2 2 5 1.4 1.3 3 5 1.5 1.4 4 10 1.3 1.3 5 10 1.4 1.4 6 10 1.5 1.2 7 15 1.3 1.4 8 15 1.4 1.2 9 15 1.5 1.3

[0073] S5. For each group of orthogonal test schemes in the orthogonal test table, a physical model of the bionic shark skin tooth fin 4 is established respectively;

[0074] S6. Perform numerical simulation calculations on the models established in S5 and obtain simulation results: mesh the established models using Fulentmeshing software, and use Fulent software to perform numerical simulations to obtain the average Nusselt number and average friction factor of the models; calculate the values ​​of the comprehensive evaluation index TP of each model, as shown in Table 3.

[0075] Table 3 Simulation results

[0076] Serial number θ Lm: Ls Hm:Hs TP 1 5 1.3 1.2 1.26816 2 5 1.4 1.3 1.29130 3 5 1.5 1.4 1.27880 4 10 1.3 1.3 1.26647 5 10 1.4 1.4 1.27869 6 10 1.5 1.2 1.26855 7 15 1.3 1.4 1.26328 8 15 1.4 1.2 1.27462 9 15 1.5 1.3 1.26899

[0077] S7. Perform signal-to-noise ratio analysis and variance analysis on the simulation results of each model, and determine the degree of influence of each control factor on the comprehensive performance; use the signal-to-noise ratio S / N to measure the robustness of the design parameters. The higher the signal-to-noise ratio S / N value, the less loss, the smaller the volatility of the product, and the more stable the quality. There are three types of signal-to-noise ratios for static quality characteristics of products, namely, the small characteristic, the large characteristic, and the eye characteristic. Select the comprehensive performance index (TP) as the response, using the large characteristic:

[0078] S / N=-10log(Σ(1 / Y 2 ) / n) (1)

[0079] Table 4 is a table of signal-to-noise ratio values

[0080] Serial number θ Lm: Ls Hm:Hs TP S / N 1 5 1.3 1.2 1.26816 2.07195 2 5 1.4 1.3 1.29130 2.21277 3 5 1.5 1.4 1.27880 2.13532 4 10 1.3 1.3 1.26647 2.05120 5 10 1.4 1.4 1.27869 2.14381 6 10 1.5 1.2 1.26855 2.05841 7 15 1.3 1.4 1.26328 2.02221 8 15 1.4 1.2 1.27462 2.10687 9 15 1.5 1.3 1.26899 2.07762

[0081] Table 5 is the signal-to-noise ratio response table

[0082]

[0083] Variance analysis is the proportion of the product's optimization variables to the optimization target at each level. If the result error caused by the change in the variable level exceeds the error range, it means that the change in the variable level has a significant impact on the optimization target. If the experimental error caused by the change in the variable level is within the error range, the variable level has a small impact on the optimization target and can be regarded as an error negligible. According to the above basic method of variance analysis, the influence of each factor on the optimization target Fi, that is, the ratio of the variance and SSF caused by each influencing variable to the total variance and ST, is used to characterize it. The calculation formula is as follows:

[0084]

[0085] S SF =3(m f1 -m) 2 +3(m f2 -m) 2 +3(m f3 -m) 2 +3(m f4 -m) 2 +3(m f5 -m) 2 (3)

[0086]

[0087] In the formula, is the overall average of the signal-to-noise ratio; is the variance caused by each variable; is the overall variance and; is the signal-to-noise ratio of the th experiment; is the mean signal-to-noise ratio of the variable at the level; is the contribution rate of each structural parameter to the optimization target.

[0088] The contribution percentage of each structural parameter to the influence of TP was determined by variance analysis as shown in Table 6.

[0089] Table 6 Contribution percentage of structural parameters to TP

[0090]

[0091] S8. Optimize the structure through analysis results, establish an optimization parameter model, and obtain the optimal structural parameters through numerical simulation verification.

[0092] The results of variance analysis are as follows Fig. 9 As shown in the figure, from the variance analysis, we know that Lm:Ls has the greatest impact on the comprehensive performance of the radiator, so we should choose Lm:L=1.4. The change of θ will also have a certain degree of impact on the comprehensive performance of the radiator. According to the analysis, the angle should be as small as possible, so we choose the angle as θ=5°. Hm:Hs has a small impact on the comprehensive performance of the radiator and should be controlled above 1.2. To prevent errors, we choose Hm:Hs=1.3 and 1.4. From this, we get two sets of optimization models, namely model 1 (θ=5°, Lm:L=1.4, Hm:Hs=1.3) and model 2 (θ=5°, Lm:L=1.4, Hm:Hs=1.4).

[0093] Simultaneously, the two groups of models and the conventional straight channel liquid cooling radiator (model 3) were simulated to compare the Reynolds number and TP under different mass flow rates. Fig.10 As shown, the best parameter combination is θ=5°, Lm:L=1.4, Hm:Hs=1.4, and the comprehensive performance is improved by 20%-30%. The optimized bionic shark skin tooth fin structure is more reasonable, and the comprehensive performance of the radiator is improved at the same time.

[0094] The above embodiments are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. A bionic shark skin tooth fin liquid cooling device, characterized in that: include: A shell (1), wherein a heat exchange medium is introduced into the shell (1); A plurality of bionic shark skin tooth fins (4) are arranged on the inner wall surface of the shell (1), and the bionic shark skin tooth fins (4) include a stem portion (5), a middle ridge (6), and side ridges (7); the stem portion (5) gradually increases in height along the flow direction of the fluid, the middle ridge (6) is located in the middle of the stem portion (5), and two side ridges (7) are symmetrically distributed on both sides of the middle ridge (6); the middle ridge (6) and the side ridges (7) both extend from the flow-facing surface of the stem portion (5) to the tail of the stem portion (5), and are streamlined.

2. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The two side surfaces of the middle ridge (6) are inwardly concave smooth curved surfaces, and the bottom edge lines of the two curved surfaces are connected to the upper surface of the stem portion (5), and the connection is smoothly transitioned.

3. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The side ridge (7) comprises an inner curved surface and an outer curved surface. The outer curved surface of the side ridge (7) is an outwardly convex smooth curved surface, the bottom of which coincides with the edge line of the stem (5), and the connection is smoothly transitioned; the inner curved surface of the side ridge (7) is an inwardly concave smooth curved surface, the bottom of which is connected to the upper surface of the stem (5), and the connection is smoothly transitioned.

4. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The bottom edge line of the inner curved surface of the side ridge does not intersect with the bottom edge line of the middle ridge (6) on the same side, and a middle flow channel (8) is formed on the upper surface of the stem (5), and the width of the middle flow channel (8) gradually decreases along the flow direction of the fluid.

5. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The chord length of the side ridge is expressed as Ls, the chord length of the middle ridge is Lm, and the chord length ratio of the side ridge and the middle ridge is 0.8-1.

2.

6. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The chord length Lm of the middle ridge is equal to the span length L of the outer ridge.

7. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The height of the side ridge is denoted as H s , the height of the middle ridge is denoted as H m The height ratio of the side ridges to the middle ridges is 0.75-1.

8. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The slope of the stem (5) is an incident angle θ, and the incident angle θ is 5°-20°.

9. The bionic shark skin tooth fin liquid cooling device according to claim 1, characterized in that: The bionic shark skin tooth fins (4) are arranged in an array with equal spacing or variable spacing on the inner wall surface of the housing (1).

10. A method for optimizing a bionic shark skin tooth fin liquid cooling device, characterized in that: The steps include: S1. Construct a physical model of the bionic shark skin tooth fin liquid cooling device according to claim 1; S2, select the comprehensive evaluation index TP as the response target; S3, taking the structural parameters of the bionic shark skin tooth fin (4) as control factors, selecting a plurality of different level numbers for each control factor; the selected structural parameters include the incident angle, the chord length ratio of the middle ridge and the side ridge Lm:Ls, and the height ratio of the middle ridge and the side ridge Hm:Hs; S4. Generate several groups of orthogonal test schemes based on the control factors, the number of levels corresponding to each control factor, and the comprehensive evaluation index TP. S5. For each group of orthogonal experimental schemes, a physical model of the bionic shark skin tooth fin (4) is established respectively; S6, numerically simulate all the physical models established in S5 to obtain a comprehensive evaluation index TP of each model; S7. Perform signal-to-noise ratio analysis and variance analysis on the simulation results of each model, and determine the influence of each control factor on the comprehensive performance; S8. The bionic shark skin tooth fin (4) is structurally optimized based on the analysis results to obtain the optimal structural parameters.

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