Vein-shaped composite bionic micro-channel radiator with petal-shaped fins

Abstract

The invention discloses a vein-shaped composite bionic micro-channel radiator with petal-shaped fins, relates to the technical field of radiators, and solves the problems that the temperature uniformity of a radiating area of a micro-channel radiator is poor, and extra pumping work consumption is caused. A first-stage vein flow channel is arranged in the center of a micro-channel heat sink, and a hot plate is arranged at the bottom of the micro-channel heat sink; the micro-channel heat sink comprises two first heat sinks and two second heat sinks, and the second heat sinks and the first heat sinks are in mirror symmetry. A plurality of second-level vein runners, a plurality of third-level vein runners and a plurality of fin arrays are arranged in the first heat sink, and the second-level vein runners are obliquely arranged and communicate with the first-level vein runners; the plurality of third-stage vein runners are arranged among the second-stage vein runners at equal intervals; the fin array is arranged at the tail end in the second-stage vein flow channel; the fin array comprises two fins, and the fins are arc-shaped plates. The invention has the characteristics of high heat dissipation efficiency, good temperature uniformity, low flow resistance and small pressure drop, thereby ensuring efficient and stable operation of high-power micro devices.

Description

Technical Field

[0001] The invention relates to the technical field of radiators, in particular to a leaf vein-shaped composite bionic microchannel radiator with petal-shaped fins. Background Art

[0002] At present, the rapid development of science and technology has greatly improved the integration level of devices in the fields of microelectronic equipment, laser equipment, aerospace and advanced semiconductor processes. The power density of the system has also increased, resulting in a sharp increase in the heat generated by related equipment. In order to avoid thermal runaway and other phenomena, it is necessary to propose a thermal management system with high heat dissipation efficiency and excellent heat dissipation performance. A microchannel radiator refers to a heat exchanger with an equivalent channel diameter of 10-1000μm. There are dozens of tiny flow channels in the flat tubes of this heat exchanger. Due to the advantages of large heat exchange area and high heat transfer coefficient in the tiny flow channels, the heat dissipation performance of the microchannel radiator is better than that of the large-scale radiator, and it has broad application prospects in the fields of high-power, high-integration, and tiny device heat dissipation.

[0003] The microchannel heat sinks currently used are mostly direct-flow microchannels and manifold microchannels, but there are still some problems: the direct-flow microchannel has limited cooling capacity, the cooling capacity at the end of the channel is poor, the fluid temperature has a large gradient along the channel direction, and the heat dissipation uniformity is poor. In addition, the direct-flow microchannel has a large internal pressure drop, the flow state is unstable, it is prone to small vibrations, and the pump labor consumption is large; the manifold microchannel has multiple diversion ports, and because the flow velocity in each flow channel is different, the heat transfer efficiency is different, resulting in uneven temperature distribution of the cooled device. On the other hand, there are problems such as uneven distribution of working fluid and easy flow blockage inside the manifold microchannel, which may lead to "local hot spots" and affect the performance of the cooled device. Therefore, the poor temperature uniformity in the heat dissipation area, mechanical vibration caused by the large flow pressure drop, and additional pump labor consumption restrict the practical application of microchannel heat sinks. Summary of the invention

[0004] In order to solve the above-mentioned problems of poor temperature uniformity in the heat dissipation area of ​​the microchannel radiator and extra pump labor consumption, the present invention proposes a leaf vein-shaped composite bionic microchannel radiator with petal-shaped fins. The present invention has the characteristics of high heat dissipation efficiency, good temperature uniformity, low flow resistance and small pressure drop, thereby ensuring the efficient and stable operation of high-power micro devices.

[0005] The present invention proposes a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins, which specifically includes a microchannel heat sink and a primary leaf vein flow channel, the primary leaf vein flow channel is arranged at the center of the microchannel heat sink, and a heat plate is arranged at the bottom of the microchannel heat sink; the microchannel heat sink includes two heat sinks one and two heat sinks two; the two heat sinks one and the two heat sinks two are arranged in a matrix, the two heat sinks one are diagonal to each other, and the two heat sinks two are diagonal to each other; a plurality of secondary leaf vein flow channels, a plurality of tertiary leaf vein flow channels and a plurality of fin arrays are arranged in the heat sink one, the plurality of secondary leaf vein flow channels are arranged obliquely and are connected with the primary leaf vein flow channels; a plurality of tertiary leaf vein flow channels are arranged at equal intervals between the secondary leaf vein flow channels; the fin array is arranged at the inner end of the secondary leaf vein flow channel; the fin array includes two fins, and the fins are arc-shaped plates; the heat sink two and the heat sink one are mirror-symmetrical.

[0006] Furthermore, the edge of the rib is a Fibonacci spiral.

[0007] Furthermore, the angle between the secondary leaf vein flow channel and the primary leaf vein flow channel is 10 degrees.

[0008] Furthermore, the ends of the two secondary leaf vein flow channels in the secondary leaf vein flow channels close to the upper edge of the microchannel heat sink are bent to a direction perpendicular to the upper edge of the microchannel heat sink.

[0009] Furthermore, the first secondary leaf vein flow channel and the second secondary leaf vein flow channel near the upper edge of the heat sink are not connected.

[0010] Furthermore, the secondary blade vein flow channel near the lower edge in the heat sink has a flow channel root parallel to a lower edge of the heat sink.

[0011] Furthermore, no fin array is provided in the first secondary blade vein flow channel near the upper edge of the heat sink.

[0012] Furthermore, the tertiary vein flow channel is an arc-shaped flow channel.

[0013] Furthermore, the center of curvature of the leftmost tertiary blade vein flow channel in the heat sink one coincides with the left boundary of the heat sink one.

[0014] Furthermore, the tertiary leaf vein flow channels on the upper and lower sides of the secondary leaf vein flow channel are symmetrical about the secondary leaf vein flow channel.

[0015] The beneficial effects of the leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention are:

[0016] (1) The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention has excellent heat dissipation performance and good temperature uniformity. In the application of thermal management of laser crystals in solid lasers, compared with DC microchannels with the same heat exchange area, when the thermal power of the laser crystal is 20W and the flow rate of the working fluid is 12ml / min, the maximum temperature of the crystal surface is 305.7043K, which is 3.1368K lower than that of the DC microchannel; the maximum temperature difference of the crystal surface is 1.4819K, which is 69.38% lower than that of the DC microchannel. Under higher power, the heat dissipation capacity is further enhanced compared with the DC type, and the flow rate remains unchanged. When the power is increased to 30W, the maximum temperature of the crystal surface is 4.7687K lower than that of the DC microchannel, and the maximum temperature difference of the crystal surface is only 2.2145K. It can be seen that the structure still has excellent heat dissipation performance under higher heat load.

[0017] (2) The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention has a small flow pressure drop, reduces pump labor consumption, has excellent topology, small fluid inlet and outlet pressure drop, small flow resistance, and strong heat exchange capacity. Compared with the direct-flow microchannel with the same heat exchange area, when the flow rate is 12ml / min, the flow pressure drop of this bionic structure is only 33.09Pa, which is only 51.53% of the direct-flow microchannel. When the flow rate increases to 24ml / min, the pressure drop of this structure is 71.43Pa, which is 51.87% of the direct-flow microchannel. It can be seen that as the flow rate continues to increase, the relative pressure drop remains almost unchanged. This structure has the characteristics of small pressure drop, low pump labor consumption, and stable flow.

[0018] (3) The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention can meet the unique heat dissipation requirements of high-power micro devices and can be applied to the heat dissipation field of high-power micro devices. It has the characteristics of high heat dissipation efficiency, strong temperature uniformity, stable heat dissipation, and small flow pressure drop. In the application of thermal management of laser crystals in solid lasers, it can ensure that the laser crystal maintains a crystal surface temperature difference within 1-3°C in the power range of 10-30W, and significantly reduce the thermal lens effect, thermal stress and crystal cracking caused by thermal effects and uneven temperature distribution during the operation of the laser crystal. The bionic structure microchannel has excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is a structural schematic diagram of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0022] Figure 2 It is a schematic structural diagram of a flow channel of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0023] Figure 3 It is a structural schematic diagram of a heat sink of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0024] Figure 4 It is a structural schematic diagram of a heat sink-flow channel of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0025] Figure 5 It is a top view of the flow channel of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0026] Figure 6 It is a structural schematic diagram of a fin array of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0027] Figure 7 It is a side view of a fin array of a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to the present invention;

[0028] Figure 8 This is a comparison diagram of the heat dissipation effects of a leaf vein-shaped composite bionic microchannel radiator with petal-shaped fins described in the present invention and other microchannel radiators;

[0029] Fig. 9 It is a diagram of a reticular leaf vein structure imitated by a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention;

[0030] Fig.10 It is a diagram of a special-shaped petal structure imitated by a leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention;

[0031] Among them: 1-microchannel heat sink, 2-fluid inlet, 3-cooling medium, 4-fin array, 5-fluid outlet, 6-primary leaf vein flow channel, 7-secondary leaf vein flow channel, 8-tertiary leaf vein flow channel, 9-fin, 10-heat sink one, 11-heat sink two. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Specific implementation method 1: See Figure 1-Figure 10 Specific description of this embodiment. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in this embodiment specifically includes a microchannel heat sink 1 and a primary leaf vein flow channel 6, the primary leaf vein flow channel 6 is arranged at the center of the microchannel heat sink 1, the overall size of the microchannel heat sink 1 is 14mm×14mm×1mm, a heat plate is arranged at the bottom of the microchannel heat sink 1, and the primary leaf vein flow channel 6 is perpendicular to the heat plate; the flow channel width of the primary leaf vein flow channel 6 is 0.3mm, the depth is 1mm, and the upper and lower ends are 0.5mm away from the edge of the microchannel heat sink 1; the microchannel heat sink 1 includes two heat sinks 10 and two heat sinks 11; the two heat sinks 10 and the two heat sinks 11 are arranged in a matrix around the primary leaf vein flow channel 6, the two heat sinks 10 are arranged diagonally to each other, and the two heat sinks 11 are arranged diagonally to each other; the structures of the heat sink 2 11 and the heat sink 10 are mirror-symmetrical to each other;

[0037] Taking the heat sink 10 as an example, the structure is introduced. A plurality of secondary leaf vein flow channels 7, a plurality of tertiary leaf vein flow channels 8 and a plurality of fin arrays 4 are arranged in the heat sink 10. The plurality of secondary leaf vein flow channels 7 are arranged obliquely and connected with the primary leaf vein flow channels 6. The angle between the secondary leaf vein flow channels 7 and the primary leaf vein flow channels 6 is 10 degrees. The flow channel width of the secondary leaf vein flow channel 7 is 0.3 mm, the flow channel depth is 0.5 mm, and the flow channel spacing is 0.3 mm.

[0038] A number of tertiary leaf vein flow channels 8 are arranged at equal intervals between the secondary leaf vein flow channels 7, six are arranged along the direction of the secondary leaf vein flow channels 7, and nine groups are arranged perpendicular to the direction of the secondary leaf vein flow channels 7. No tertiary leaf vein flow channels 8 are arranged between the first secondary leaf vein flow channel 7 and the second secondary leaf vein flow channel 7 near the upper edge in the heat sink 10; the rib array 4 is arranged at the inner end of the secondary leaf vein flow channel 7, and no rib array 4 is arranged in the first secondary leaf vein flow channel 7 near the upper edge in the heat sink 10; and except for the rib array 4 in the second secondary leaf vein flow channel 7 near the upper edge in the heat sink 10, the center lines of the remaining rib arrays 4 are perpendicular to the secondary leaf vein flow channel 7; the rib array 4 imitates the shape of petals, including two ribs 9, and the ribs 9 are arc-shaped plates; the upper end of one rib 9 is connected to the upper surface inside the secondary leaf vein flow channel 7, and the lower end of the other rib 9 is connected to the heat plate, and the two ribs 9 are buckled together but not in contact, such as Figure 6-Figure 7 shown.

[0039] The edge of the fin 9 is a Fibonacci spiral line, the length of the fin 9 is 1mm, and the thickness is 0.01mm; the curvature radius of the constituent lines of the Fibonacci spiral line is 0.1mm and 0.2mm respectively; in order to ensure the rationality of processing, the inner edge curve of the upper fin 9 of the two fins 9 is cut at a vertical distance of 0.02mm from the upper surface of the secondary leaf vein flow channel 7, so that a right-angle structure is formed at the connection position; the inner edge curve of the lower fin 9 is cut at a vertical distance of 0.02mm from the hot plate, so that a right-angle structure is formed at the connection position, such as Figure 7 shown.

[0040] The two secondary leaf vein flow channels 7 near the upper edge of the heat sink 10 in the secondary leaf vein flow channel 7 have their flow channel ends bent at a position 0.3 mm away from the upper edge of the heat sink 10 to be perpendicular to the upper edge of the heat sink 10, such as Figure 5 shown.

[0041] The secondary blade vein flow channel 7 near the lower edge in the heat sink 10 has its flow channel root parallel to the lower edge of the heat sink 10.

[0042] The tertiary leaf vein flow channel 8 is an arc-shaped flow channel, the curvature radius of the tertiary leaf vein flow channel 8 is 0.9 mm, the spacing between the tertiary leaf vein flow channels 8 in the same group is 1 mm, and the flow channel depth is 0.5 mm.

[0043] The center of curvature of the leftmost tertiary leaf vein flow channel 8 in a group of tertiary leaf vein flow channels 8 near the lower edge of the heat sink 10 coincides with the left boundary of the heat sink 10, and the center of curvature of the leftmost tertiary leaf vein flow channel 8 is 0.1 mm away from the left end of the fin array 4 near the lower edge.

[0044] The two groups of tertiary leaf vein flow channels 8 adjacent to each other above and below the secondary leaf vein flow channel 7 are symmetrical with respect to the secondary leaf vein flow channel 7 .

[0045] The specific working process of the leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention is as follows:

[0046] The cooling medium 3 inside the microchannel heat sink 1 flows along the fluid inlet 2 perpendicular to the heat plate and enters the primary leaf vein flow channel 6; the cooling medium 3 flows into the secondary leaf vein flow channel 7 via the primary leaf vein flow channel 6, and the secondary leaf vein flow channel 7 realizes uniform transportation of the cooling medium 3.

[0047] The tertiary leaf vein flow channels 8 are evenly spaced between adjacent secondary leaf vein flow channels 7. The tertiary leaf vein flow channels 8 are arc-shaped flow channels, which have a larger heat exchange area and smaller flow resistance than straight-line flow channels. The primary, secondary and tertiary flow channels form a leaf vein-shaped mesh structure, which can realize the rapid and uniform delivery of the cooling medium 3 in the heat dissipation area.

[0048] The cooling medium 3 flows through the mesh veins to the edge of the microchannel heat sink 1. At this time, the temperature of the cooling medium 3 increases, the temperature difference with the heat source decreases, and the heat dissipation capacity decreases. In order to enhance the heat exchange capacity at the edge of the microchannel heat sink, a petal-shaped fin array 4 is designed and installed to increase the heat exchange area at the edge, add flow disturbances, and destroy the thermal boundary layer, ultimately achieving the purpose of enhancing the heat exchange capacity, compensating for the performance loss caused by the reduction of the temperature difference, and ensuring the temperature uniformity of the entire heat dissipation area.

[0049] Figure 8 This paper provides three examples of microchannels with the same heat transfer area applied to the thermal management system of laser crystals in solid-state lasers. The three microchannels are direct current microchannel, bionic lung microchannel and leaf vein-shaped composite bionic microchannel with petal-shaped fins. The surface temperature difference of the laser crystal and the convection heat transfer coefficient of the fluid-solid coupling interface are also given. Figure 8It can be seen that under the condition of constant flow, with the increase of thermal power, the surface temperature difference of the laser crystal cooled by the three microchannels increases linearly. The surface temperature difference of the DC microchannel crystal is the largest and the increase is the largest. Under the same power, the maximum temperature difference of its crystal surface is greater than that of the other two microchannel crystals; the temperature difference of the bionic lung type and the composite bionic microchannel has a similar increase, and the temperature distribution is more uniform than that of the DC microchannel. When the thermal power is 30W, the maximum temperature difference of the DC microchannel laser crystal surface is 7.2441K, and the maximum temperature difference of the composite bionic microchannel crystal surface is 2.2145K, which is 69.43% lower than the DC maximum temperature difference, and has good temperature uniformity. The convective heat transfer coefficients of the three increase with the increase of thermal power, but the increase gradually decreases. The convective heat transfer coefficient is mainly affected by the channel structure and the fluid flow rate. After the power increases to a certain extent, the change of the convective heat transfer coefficient gradually tends to be stable. Figure 8 The composite bionic microchannel shown in the figure has the highest convective heat transfer coefficient at the same thermal power. When the thermal power is 30W, its convective heat transfer coefficient is 3615.528W / (m 2 ·K), which is significantly higher than that of bionic lung and direct current microchannel.

[0050] To summarize the above implementation cases, the leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention has excellent heat dissipation performance and good temperature uniformity. In the thermal management application of laser crystals in solid lasers, compared with DC microchannels with the same heat exchange area, when the thermal power of the laser crystal is 20W and the flow rate of the working fluid is 12ml / min, the maximum temperature of the crystal surface is 305.7043K, which is 3.1368K lower than that of the DC microchannel; the maximum temperature difference of the crystal surface is 1.4819K, which is 69.38% lower than that of the DC microchannel. Under higher power, the heat dissipation capacity is further enhanced compared with the DC type, and the flow rate remains unchanged. When the power is increased to 30W, the maximum temperature of the crystal surface is 4.7687K lower than that of the DC type, and the maximum temperature difference of the crystal surface is only 2.2145K. It can be seen that the structure still has excellent heat dissipation performance under higher heat loads. The leaf vein-shaped composite bionic microchannel radiator with petal-shaped fins described in the present invention has a small flow pressure drop, reduces pump labor consumption, has excellent topology, small fluid inlet and outlet pressure drop, small flow resistance, and strong heat exchange capacity. Compared with the direct-flow microchannel with the same heat exchange area, when the flow rate is 12ml / min, the flow pressure drop of this bionic structure is only 33.09Pa, which is only 51.53% of the direct-flow microchannel. When the flow rate increases to 24ml / min, the pressure drop of this structure is 71.43Pa, which is 51.87% of the direct-flow microchannel. It can be seen that the relative pressure drop remains almost unchanged as the flow rate continues to increase. This structure has the characteristics of small pressure drop, low pump labor consumption, and stable flow. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins described in the present invention can meet the unique heat dissipation requirements of high-power micro devices, can be applied to the field of heat dissipation of high-power micro devices, has the characteristics of high heat dissipation efficiency, strong temperature uniformity, stable heat dissipation, and small flow pressure drop. In the application of thermal management of laser crystals in solid lasers, it can ensure that the laser crystal maintains a crystal surface temperature difference within 1-3°C in the power range of 10-30W, and significantly reduces the thermal lens effect, thermal stress and crystal cracking caused by thermal effects and uneven temperature distribution during the operation of the laser crystal. The bionic structure microchannel has excellent performance.

[0051] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the invention. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins, characterized in that: The invention comprises a microchannel heat sink (1) and a primary leaf vein flow channel (6), wherein the primary leaf vein flow channel (6) is arranged at the center of the microchannel heat sink (1), and a heat plate is arranged at the bottom of the microchannel heat sink (1); the microchannel heat sink (1) comprises two heat sinks 1 (10) and two heat sinks 2 (11); the two heat sinks 1 (10) and the two heat sinks 2 (11) are arranged in a matrix, the two heat sinks 1 (10) are diagonally opposite to each other, and the two heat sinks 2 (11) are diagonally opposite to each other; A plurality of secondary leaf vein flow channels (7), a plurality of tertiary leaf vein flow channels (8) and a plurality of fin arrays (4) are arranged in the heat sink (10); the plurality of secondary leaf vein flow channels (7) are arranged obliquely and are connected to the primary leaf vein flow channels (6); the plurality of tertiary leaf vein flow channels (8) are arranged at equal intervals between the secondary leaf vein flow channels (7); the fin array (4) is arranged at the inner end of the secondary leaf vein flow channel (7); the fin array (4) includes two fins (9), and the fins (9) are arc-shaped plates; Heat sink 2 (11) and heat sink 1 (10) are mirror-symmetrical.

2. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 1, characterized in that: The edge of the rib (9) is a Fibonacci spiral.

3. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 1, characterized in that: The angle between the secondary leaf vein flow channel (7) and the primary leaf vein flow channel (6) is 10 degrees.

4. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 3, characterized in that: The two secondary leaf vein flow channels (7) in the secondary leaf vein flow channels (7) close to the upper edge of the heat sink (10) have their flow channel ends bent in a direction perpendicular to the upper edge of the heat sink (10).

5. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 4, characterized in that: The first secondary leaf vein flow channel (7) and the second secondary leaf vein flow channel (7) near the upper edge in the heat sink (10) are not connected.

6. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 3, characterized in that: The secondary blade vein flow channel (7) near the lower edge in the heat sink (10) has a flow channel root that is parallel to the lower edge of the heat sink (10).

7. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 1, characterized in that: The first secondary blade vein flow channel (7) near the upper edge of the heat sink (10) is not provided with a fin array (4).

8. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 1, characterized in that: The tertiary leaf vein channel (8) is an arc-shaped flow channel.

9. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 8, characterized in that: The center of curvature of the leftmost third-level blade vein flow channel (8) in the heat sink one (10) coincides with the left boundary of the heat sink one (10).

10. The leaf vein-shaped composite bionic microchannel heat sink with petal-shaped fins according to claim 1, 8 or 9, characterized in that: The tertiary leaf vein flow channels (8) on the upper and lower sides of the secondary leaf vein flow channel (7) are symmetrical with respect to the secondary leaf vein flow channel (7).

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