Impact jet flow double-layer micro-channel heat sink structure with fins and working method of impact jet flow double-layer micro-channel heat sink structure

Abstract

The invention provides an impact jet flow double-layer micro-channel heat sink structure with fins and a working method thereof, and belongs to the technical field of micro-channel enhanced heat dissipation, the impact jet flow double-layer micro-channel heat sink structure comprises an upper-layer micro-channel, a lower-layer micro-channel and a plurality of partition plates, the upper-layer micro-channel and the lower-layer micro-channel are connected through a middle layer, and the partition plates vertically penetrate through the upper-layer micro-channel and the lower-layer micro-channel; the upper-layer micro-channel comprises a heat sink top, a first inlet area is arranged on the heat sink top, a flow dividing area is arranged on the lower portion of the first inlet area, flow guiding areas are arranged on the two sides of the flow dividing area, a second inlet area and a third inlet area are arranged at ports of the two sides of the upper-layer micro-channel respectively, and fins are installed below the heat sink top. A confluence area is formed between the fins and the middle layer, the lower-layer micro-channel comprises a heat sink substrate, and outlet areas are arranged at ports of the two sides of the lower-layer micro-channel respectively; the heat exchanger has the characteristics of high efficiency, relatively uniform convective heat exchange performance, low energy dissipation and high overall heat exchange.

Description

Technical Field

[0001] The invention relates to the technical field of microchannel enhanced heat dissipation, and in particular to a double-layer microchannel heat sink structure with finned impact jets and a working method thereof. Background Art

[0002] The new generation of aerospace VLSI, laser reflectors, high-power semiconductor lasers and other high-density, ultra-precision microelectronic components are rapidly developing towards high integration, scale and miniaturization, resulting in an increasing heat transfer load in the heat exchange system of microelectronic devices, with heat flux density exceeding 1000 W / cm 2 , under the condition of small heat dissipation bottom area and high transient heat flux density, if the device surface temperature cannot be effectively reduced and the uniformity of device surface temperature distribution cannot be maintained, the device performance and stability will decline rapidly, and even the device will be burned; it can be seen that the heat dissipation problem of high heat flux density microelectronic devices restricts the development of modern high-tech, and is increasingly widely valued by the international heat transfer and mass transfer community and related industrial fields. In view of the harsh working environment of modern high heat flux density microelectronic devices, the corresponding electronic chip failure rate increases exponentially with the increase of temperature. Excessive working temperature causes the chip failure rate to exceed 55%. For high-power semiconductor laser arrays, the service life will be reduced by an order of magnitude if the temperature rises by 30 ℃; especially when entering the emergency working state, the sudden increase in a large amount of heat becomes a bottleneck problem that restricts the efficient operation of modern high heat flux density microdevices; therefore, it is imperative to arrange an efficient and compact cooling system on high heat flux density microdevices for efficient and enhanced heat dissipation.

[0003] Since the 1970s, when Tuckerman and Pease first proposed the concept of "microchannel heat sinks (MHS)", the microchannel heat dissipation system has become a hot topic of concern for scholars at home and abroad due to its many advantages such as small size, light weight, large specific surface area, and high heat transfer intensity per unit area. In the early days, due to the limitations of processing technology, relevant scholars mainly studied the flow and heat transfer characteristics of straight channel heat sinks with equal cross-sections in simple structures. It was found that the thermal boundary layer of the fluid in the laminar state continued to develop along the flow direction, resulting in a significant increase in the base temperature of the microchannel heat sink structure, which is very easy to cause overheating. With the rapid development of the electronic information industry, the increasing thermal load of high heat flux density components and the increasingly precise temperature control range have caused the simple microchannel heat dissipation structure to be unable to meet the modern heat dissipation needs. A variety of enhanced heat transfer methods are urgently needed to improve the heat transfer characteristics of the microchannel heat dissipation system. Summary of the invention

[0004] The purpose of the present invention is to provide a double-layer microchannel heat sink structure with fins and impingement jets and a working method thereof, so as to overcome the problems existing in the prior art. The present invention can provide a double-layer microchannel heat sink structure with fins and impingement jets, which is suitable for thermal management of high heat flux density devices and has high efficiency and relatively uniform convective heat transfer performance, low energy dissipation and high overall heat transfer characteristics. The fins are provided to change the flow direction of the coolant in the channel, so that the flow path of the coolant is increased, the turbulence effect is enhanced, the impingement jet effect is enhanced, and the convective heat transfer capacity is improved; by providing three inlet areas, the coolant can enter the interior of the heat sink more directly, which greatly shortens the cooling time. The path of the coolant from the inlet to the heat sink base is improved, thereby greatly improving the cooling efficiency, and further greatly enhancing the cooling effect on the heat sink base; by arranging the upper microchannel and the lower microchannel to be connected, a mixed vortex can be generated, forming a stronger fluid disturbance phenomenon, which greatly improves the cooling performance of the coolant, and further improves and strengthens the heat exchange capacity; the present invention can also provide a working method of a double-layer microchannel heat sink structure with finned impact jets, which can improve the heat exchange efficiency. When the three coolants converge in the confluence area, a significant liquid disturbance phenomenon will be formed, which can promote mixing and heat transfer inside the coolant, and further improve the heat dissipation performance of the heat sink.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A double-layer microchannel heat sink structure with finned impact jet comprises an upper microchannel, a lower microchannel and a plurality of partitions, wherein the upper microchannel and the lower microchannel are connected through an intermediate layer, and the plurality of partitions vertically penetrate the upper microchannel and the lower microchannel to form a plurality of layers of regions; the upper microchannel comprises a heat sink top, a first inlet area is arranged on the heat sink top, a flow diversion area is arranged at the lower part of the first inlet area, and both sides of the flow diversion area are flow guide areas; the ports on both sides of the upper microchannel are respectively provided with a second inlet area and a third inlet area; fins are installed below the heat sink top, and a confluence area is formed between the fins and the intermediate layer; the lower microchannel comprises a heat sink base, and the ports on both sides of the lower microchannel are respectively provided with outlet areas; Furthermore, the plurality of partitions are parallel to each other; the heights of the upper microchannel and the lower microchannel are equal; Furthermore, the diversion area is a hollow structure; Further, the first inlet area is arranged in the central area of ​​the top of the heat sink; Further, the first inlet area, the second inlet area and the third inlet area of ​​each layer area are all rectangular, with a length of 0.9 mm and a width of 0.4 mm; Furthermore, the angle between the fin and the top of the heat sink is 90°; Furthermore, the fin is a rectangular structure; the fin is symmetrically installed on both sides of the first inlet area, and the distance between the fin and the first inlet area is 1-5 mm.

[0006] A working method of a double-layer microchannel heat sink structure with finned impingement jets, based on the above-mentioned double-layer microchannel heat sink structure with finned impingement jets, comprises the following steps: (1) The coolant enters the heat sink structure through the first inlet area, the second inlet area, and the third inlet area at the same time; (2) The three coolants merge in the confluence area, forming a liquid disturbance phenomenon; (3) The coolant flows out through the outlet area, completing the cooling work; Furthermore, in the step 1, the coolant enters the heat sink structure through the first inlet area specifically as follows: the coolant passes through the first inlet area, enters the diversion area under the interference of the fins, then enters the guide area, and then enters the confluence area; Furthermore, in the step 1, the coolant enters the heat sink structure through the second inlet area and the third inlet area specifically as follows: the coolant passes through the second inlet area and the third inlet area and enters the confluence area under the interference of the fins.

[0007] The above technical solution has the following advantages or beneficial effects: The present invention provides a double-layer microchannel heat sink structure with finned impingement jets. By setting fins as turbulent structures, the flow direction of the coolant is changed in a certain area. In combination with the impingement jet principle, the coolant is almost vertically incident on the lower channel, the impingement jet effect is enhanced, and the fluid produces strong disturbance and turbulence effects, thereby significantly increasing the contact area and heat transfer coefficient between the fluid and the solid surface, effectively improving the heat transfer efficiency of the heat sink, and allowing heat to be transferred from the heat source to the fluid more quickly, and then dissipated through the microchannel system; by setting a first inlet area at the top of the heat sink and setting a second inlet area and a third inlet area at the two side ports of the upper microchannel, the coolant can enter the interior of the heat sink more directly, greatly shortening the path of the coolant from the inlet to the heat sink base. Compared with the traditional single inlet design, the layout of the present invention significantly reduces the length of the cooling circuit, shortens the cooling circuit by half, and also increases the total flow rate of the coolant, thereby greatly improving the cooling efficiency, and further greatly enhancing the cooling effect on the heat sink base; the diversion area is reasonable The fluid is evenly distributed to the guide areas on both sides to ensure that the fluid in the upper microchannel flows evenly, avoiding the problem of local overheating or uneven flow rate. At the same time, the confluence area further promotes the mixing and redistribution of the fluid, providing conditions for the efficient heat exchange of the lower microchannel; after the two streams of coolant merge, they flow out from the outlet area of ​​the lower microchannel together. The lower microchannel is the main heat exchange area, and the outlet area is set in the lower microchannel for better heat exchange effect, which can more effectively take away heat and achieve faster cooling speed and higher cooling efficiency; the double-layer microchannel design makes full use of the heat sink in the vertical direction, reduces the occupied space in the horizontal direction, and improves the compactness of the heat sink; the partition vertically penetrates the upper microchannel and the lower microchannel to form several layers of areas, which enhances the overall strength of the heat sink and improves the stability and reliability of the heat sink; this structure belongs to a microchannel, which is between the macro and micro, and has extremely high requirements on the precision of the processing equipment. The present invention is simpler than the original invention structure, has less difficulty in machine processing, and has a higher yield.

[0008] Furthermore, the partitions are parallel to each other and arranged closely, forming an orderly and efficient fluid channel, ensuring that the coolant can fully contact and take away the heat during the flow process. Under the disturbance of the fins, the coolant generates strong turbulence in the microchannel, which greatly increases the heat exchange area and heat transfer coefficient, thereby improving the heat transfer efficiency; the structure of the present invention is overall centrally symmetrical and connected as a whole, which is conducive to uniform heat dissipation and improved heat dissipation efficiency.

[0009] Furthermore, the diversion area is designed with a hollow structure. It can be seen that the present invention connects the upper microchannel and the lower microchannel. At the same time, the heights of the upper and lower microchannels are equal, which can generate mixed vortices and form a stronger fluid disturbance phenomenon, greatly improving the cooling performance of the coolant, thereby improving and strengthening the heat exchange capacity, and further improving the heat dissipation uniformity and heat dissipation efficiency.

[0010] Furthermore, placing the first inlet area in the central area of ​​the top of the heat sink allows the coolant to directly impact the center of the heat sink base via the shortest path, which is the area where heat is most concentrated, further ensuring that the coolant can effectively cool the main heat source in the initial stage, thereby improving the overall heat dissipation efficiency.

[0011] Furthermore, the design of the rectangular inlet area enables the coolant to contact the microchannel wall and fins evenly and fully, thereby maximizing the heat exchange area, improving the heat exchange efficiency per unit volume, and enabling the heat sink to achieve higher heat dissipation capacity in a smaller volume; and a reasonable inlet area size helps to reduce the pressure drop and energy consumption of the fluid in the microchannel.

[0012] Furthermore, the fins and the top of the heat sink form a 90° angle, so that the coolant enters the lower channel almost vertically, and can form a strong impact jet when flowing through the fins. The impact jet increases the heat exchange area between the fin surface and the coolant, and the impact jet effect is enhanced, which can effectively destroy the boundary layer and enhance the fluid disturbance, thereby improving the heat exchange efficiency.

[0013] Furthermore, the rectangular fins have a larger surface area and can more effectively exchange heat with the coolant; the fins are symmetrically installed on both sides of the first inlet area, which can guide the coolant entering from the inlet area to flow evenly to both sides, avoiding turbulence or backflow of the fluid in the inlet area; at the same time, the appropriate distance (1~5 mm) ensures that the fluid has a certain flow rate and pressure before reaching the fins, which is conducive to forming an effective impact jet and improving the heat exchange efficiency.

[0014] The present invention also provides a working method of a double-layer microchannel heat sink structure with finned impact jets. The coolant enters the heat sink structure through multiple inlet areas at the same time, and can quickly and evenly cover the entire heat sink surface. The distributed inlet design ensures that the heat can be taken away in a timely and effective manner, thereby improving the heat exchange efficiency. When the three streams of coolant converge in the confluence area, a significant liquid disturbance phenomenon will be formed, which not only helps to destroy the fluid boundary layer and enhance the heat exchange between the fluid and the heat sink surface, but also promotes mixing and heat transfer inside the coolant, further improving the heat dissipation performance of the heat sink.

[0015] Furthermore, after passing through the first inlet area, the coolant is interfered by the fins, and its direction and speed change, resulting in more drastic temperature changes within a small distance, which helps to destroy the fluid boundary layer and improve the heat exchange efficiency, thereby enhancing the heat exchange effect; as the fluid enters the guide area, the disturbance is further intensified, laying a good foundation for the subsequent confluence and overall heat exchange process; during the flow of the coolant in the guide area, its speed and pressure are further adjusted and optimized, so that the coolant has a more stable and efficient flow state when entering the confluence area, thereby improving the heat exchange efficiency between the coolant and the heat sink surface.

[0016] Furthermore, when the coolant enters through the second inlet area and the third inlet area, it will flow directly to the confluence area under the guidance of the fins and merge with the coolant entering from the first inlet area. As a result, the coolant passes through the fins, producing a continuous turbulence effect, significantly enhancing the flow and heat transfer characteristics, helping to improve the double-layer microchannel heat exchange effect and improving the overall heat exchange efficiency of the heat sink system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a double-layer microchannel heat sink structure with finned impact jets according to the present invention; Figure 2 It is a top view of the cross section of the middle layer of the double-layer microchannel in Example 1 of a double-layer microchannel heat sink structure with finned impact jet and a working method thereof of the present invention; Figure 3 It is a front view of a single-layer microchannel without side walls in Example 1 of a double-layer microchannel heat sink structure with finned impact jet and a working method thereof of the present invention; Figure 4 It is a numerical simulation cloud diagram of the temperature gradient of the heat sink base in Example 1 of a double-layer microchannel heat sink structure with finned impingement jet and a working method thereof of the present invention; Figure 5 A three-dimensional temperature gradient numerical simulation cloud diagram in Example 1 of a double-layer microchannel heat sink structure with finned impingement jet and a working method thereof of the present invention; Figure 6 It is a front view of a single-layer microchannel without side walls in Example 2 of a double-layer microchannel heat sink structure with finned impact jet and a working method thereof of the present invention; Figure 7 It is a numerical simulation cloud diagram of the temperature gradient of the heat sink base in Example 2 of a double-layer microchannel heat sink structure with finned impingement jet and a working method thereof of the present invention; Figure 8 It is a front view of a single-layer microchannel without side walls in Example 3 of a double-layer microchannel heat sink structure with finned impact jet and a working method thereof of the present invention; Fig. 9It is a numerical simulation cloud diagram of the temperature gradient of the heat sink base in Example 3 of a double-layer microchannel heat sink structure with finned impingement jet and a working method thereof of the present invention; In the figure, 1-1-first inlet area; 1-2-second inlet area; 1-3-third inlet area; 2-diversion area; 3-guiding area; 4-merging area; 5-outlet area; 6-middle layer; 7-heat sink base; 8-heat sink top; 9-fins. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it. In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 creative work should fall within the scope of protection of the present invention. It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] Embodiment 1: like Figure 1 As shown, the present invention provides a double-layer microchannel heat sink structure with finned impact jet, comprising an upper microchannel, a lower microchannel and a plurality of partitions, wherein the upper microchannel and the lower microchannel are connected by an intermediate layer 6, and the plurality of partitions are parallel to each other, forming an orderly and efficient fluid channel, vertically penetrating the upper microchannel and the lower microchannel to form a plurality of layers of regions; Preferably, the upper microchannel and the lower microchannel have the same height; Preferably, the structure of the present invention is centrally symmetrical as a whole and is connected as a whole, which is conducive to uniform heat dissipation and improved heat dissipation efficiency; The upper microchannel includes a heat sink top 8, and a first inlet area 1-1 is arranged in the central area of ​​the heat sink top 8, so that the coolant can directly impact the center of the heat sink base 7 in the shortest path, and this is the area where the heat is most concentrated, further ensuring that the coolant can effectively cool the main heat source in the initial stage, thereby improving the overall heat dissipation efficiency; a diversion area 2 is arranged at the lower part of the first inlet area 1-1, and the diversion area 2 is a hollow structure. It can be seen that the present invention connects the upper microchannel and the lower microchannel, which can generate a mixed vortex and form a stronger fluid The disturbance phenomenon greatly improves the cooling performance of the coolant, thereby improving and strengthening the heat exchange capacity, and further improving the heat dissipation uniformity and heat dissipation efficiency; the two sides of the diversion area 2 are the guide area 3; the two side ports of the upper microchannel are respectively provided with the second inlet area 1-2 and the third inlet area 1-3; the fins 9 are installed below the top 8 of the heat sink, symmetrically installed on both sides of the first inlet area 1-1, and can guide the coolant entering from the inlet area to flow evenly to both sides, avoiding turbulence or backflow of the fluid in the inlet area; a confluence area 4 is formed between the fins 9 and the middle layer 6; Preferably, the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 of each layer are all rectangular, with a length of 0.9 mm and a width of 0.4 mm. The design of the rectangular inlet area enables the coolant to be in uniform and sufficient contact with the microchannel wall and the fins 9, thereby maximizing the heat exchange area, improving the heat exchange efficiency per unit volume, and enabling the heat sink to achieve higher heat dissipation capacity in a smaller volume, while a reasonable inlet area size helps to reduce the pressure drop and energy consumption of the fluid in the microchannel; Preferably, the angle between the fin 9 and the top 8 of the heat sink is 90°, so that the coolant is almost vertically incident on the lower channel, and a strong impact jet can be formed when flowing through the fin 9. The impact jet increases the heat exchange area between the surface of the fin 9 and the coolant, and the impact jet effect is enhanced, which can effectively destroy the boundary layer and enhance the fluid disturbance, thereby improving the heat exchange efficiency; Preferably, the distance between the fin 9 and the first inlet area 1-1 is 1-5 mm. The appropriate distance ensures that the fluid has a certain flow rate and pressure before reaching the fin 9, which is conducive to forming an effective impact jet and improving the heat exchange efficiency. Preferably, the fin 9 is a rectangular structure. The fin 9 of the rectangular structure has a larger surface area and can more effectively exchange heat with the coolant; The lower microchannel includes a heat sink base 7, and outlet areas 5 are respectively arranged at the two side ports of the lower microchannel. The lower microchannel is the main heat exchange area, and the outlet area 5 is arranged in the lower microchannel for better heat exchange effect, which can more effectively take away heat, thereby achieving faster cooling speed and higher cooling efficiency.

[0020] The present invention also provides a working method of a double-layer microchannel heat sink structure with finned impact jets, comprising the following steps: (1) The coolant enters the heat sink structure through the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 at the same time; the coolant enters the heat sink structure through multiple inlet areas at the same time, which can quickly and evenly cover the entire heat sink surface. The distributed inlet design ensures that the heat can be taken away in a timely and effective manner, thereby improving the heat exchange efficiency; Specifically, the coolant passes through the first inlet area 1-1 and enters the diversion area 2 almost vertically under the interference of the fins 9, which produces a more drastic temperature change within a small distance range, which helps to destroy the fluid boundary layer and improve the heat exchange efficiency, thereby enhancing the heat exchange effect; then enters the guide area 3, the disturbance is further intensified, which lays a good foundation for the subsequent confluence and overall heat exchange process, and then enters the confluence area 4; Specifically, the coolant passes through the second inlet area 1-2 and the third inlet area 1-3, and enters the confluence area 4 under the interference of the fins 9; (2) The three coolants merge at the confluence area 4, forming a liquid disturbance phenomenon, which not only helps to destroy the fluid boundary layer and enhance the heat exchange between the fluid and the heat sink surface, but also promotes mixing and heat transfer inside the coolant, further improving the heat dissipation performance of the heat sink; (3) The coolant flows out through the outlet area 5, completing the cooling work.

[0021] Embodiment 2: like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a double-layer microchannel heat sink structure with finned impact jet, comprising an upper microchannel, a lower microchannel and a plurality of partitions, wherein the upper microchannel and the lower microchannel are connected through an intermediate layer 6, and the plurality of partitions are parallel to each other and vertically penetrate the upper microchannel and the lower microchannel to form a plurality of layers of regions; Preferably, the upper microchannel and the lower microchannel have the same height; Preferably, the structure of the present invention is centrally symmetrical and integrally connected; Preferably, the length of the middle layer 6 is 4.1 mm and the height is 0.2 mm; The upper microchannel includes a heat sink top 8, a first inlet area 1-1 is arranged in the central area of ​​the heat sink top 8, a diversion area 2 is arranged at the lower part of the first inlet area 1-1, the diversion area 2 is a hollow structure, and the two sides of the diversion area 2 are guide areas 3; the two side ports of the upper microchannel are respectively provided with a second inlet area 1-2 and a third inlet area 1-3; fins 9 are installed below the heat sink top 8, symmetrically installed on both sides of the first inlet area 1-1, and a confluence area 4 is formed between the fins 9 and the middle layer 6; Preferably, the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 of each layer area are all rectangular, with a length of 0.9 mm and a width of 0.4 mm; Preferably, the angle between the fin 9 and the top 8 of the heat sink is 90°; Preferably, the distance between the fin 9 and the first inlet area 1-1 is 1 mm; Preferably, the fin 9 is a rectangular structure, the height of the fin 9 is 1 mm, and the length is 0.1 mm; The lower microchannel comprises a heat sink base 7 , and two side ports of the lower microchannel are respectively provided with outlet areas 5 .

[0022] like Figure 3 As shown, the present invention also provides a working method of a double-layer microchannel heat sink structure with finned impact jets, comprising the following steps: (1) The coolant enters the heat sink structure through the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 at the same time; Specifically, the coolant passes through the first inlet area 1-1, enters almost vertically under the interference of the fins 9, impacts the heat sink base 7, generates a strong impact, and then changes the flow direction to form a diversion area 2, then enters the guide area 3, and then enters the confluence area 4; Specifically, the coolant passes through the second inlet area 1-2 and the third inlet area 1-3, and enters the confluence area 4 under the interference of the fins 9; (2) The three coolants merge in the confluence area 4. At this time, a strong liquid turbulence phenomenon is generated, destroying the thermal boundary layer; (3) After mixing, the coolant reconstructs the fluid flow trend and flows to the outlet area 5 to complete the cooling work. As a result, the coolant passes through the interference of the fins 9, generating a continuous turbulence effect, significantly enhancing the flow heat transfer characteristics, helping to improve the double-layer microchannel heat transfer effect and improve the overall heat transfer efficiency of the heat sink system.

[0023] Figure 3 middle, h 1 is the height of the upper microchannel (the heights of the upper and lower channels are the same); h 2 is the height of the middle layer 6 (the left and right sides have the same size); l 1 is the height of fin 9; l 2 is the length of the middle layer 6; d 1 is the distance between the fin 9 and the first inlet area 1-1; d 2 is the length of the fin 9 (the left and right sides have the same size).

[0024] like Figure 4 and Figure 5 As shown, in order to verify the heat dissipation advantage of the configuration design of the present invention, in Example 2, the inlet diameter is 0.9 mm, the outlet hydraulic diameter is 0.28 mm, and the base heat flux density is 200 W / cm 2 The numerical simulation diagram of the substrate temperature gradient under the conditions shows that the substrate peak temperature in Example 2 has a stronger temperature control effect than the traditional double-layer straight microchannel.

[0025] Embodiment 3: like Figure 1 and Figure 6 As shown, the present invention provides a double-layer microchannel heat sink structure with finned impact jet, comprising an upper microchannel, a lower microchannel and a plurality of partitions, wherein the upper microchannel and the lower microchannel are connected through an intermediate layer 6, and the plurality of partitions are parallel to each other and vertically penetrate the upper microchannel and the lower microchannel to form a plurality of layers of regions; Preferably, the upper microchannel and the lower microchannel have the same height; Preferably, the structure of the present invention is centrally symmetrical and integrally connected; Preferably, the length of the middle layer 6 is 4.1 mm and the height is 0.2 mm; The upper microchannel includes a heat sink top 8, a first inlet area 1-1 is arranged in the central area of ​​the heat sink top 8, a diversion area 2 is arranged at the lower part of the first inlet area 1-1, the diversion area 2 is a hollow structure, and the two sides of the diversion area 2 are guide areas 3; the two side ports of the upper microchannel are respectively provided with a second inlet area 1-2 and a third inlet area 1-3; fins 9 are installed below the heat sink top 8, symmetrically installed on both sides of the first inlet area 1-1, and a confluence area 4 is formed between the fins 9 and the middle layer 6; Preferably, the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 of each layer area are all rectangular, with a length of 0.9 mm and a width of 0.4 mm; Preferably, the angle between the fin 9 and the top 8 of the heat sink is 90°; Preferably, the distance between the fin 9 and the first inlet area 1-1 is 3 mm; Preferably, the fin 9 is a rectangular structure, the height of the fin 9 is 1 mm, and the width is 0.1 mm; The lower microchannel comprises a heat sink base 7 , and two side ports of the lower microchannel are respectively provided with outlet areas 5 .

[0026] like Figure 6 As shown, the present invention also provides a working method of a double-layer microchannel heat sink structure with finned impact jets, comprising the following steps: (1) The coolant enters the heat sink structure through the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 at the same time; Specifically, the coolant passes through the first inlet area 1-1, enters almost vertically under the interference of the fins 9, impacts the heat sink base 7, generates a strong impact, and then changes the flow direction to form a diversion area 2, then enters the guide area 3, and then enters the confluence area 4; Specifically, the coolant passes through the second inlet area 1-2 and the third inlet area 1-3, and enters the confluence area 4 under the interference of the fins 9; (2) The three coolants merge in the confluence area 4. At this time, a strong liquid turbulence phenomenon is generated, destroying the thermal boundary layer; (3) After mixing, the coolant reconstructs the fluid flow trend and flows to the outlet area 5 to complete the cooling work. As a result, the coolant passes through the interference of the fins 9, generating a continuous turbulence effect, significantly enhancing the flow heat transfer characteristics, helping to improve the double-layer microchannel heat transfer effect and improve the overall heat transfer efficiency of the heat sink system.

[0027] Figure 6 middle, h 1 is the height of the upper microchannel (the heights of the upper and lower channels are the same); h 2 is the height of the middle layer 6 (the left and right sides have the same size); l 1 is the height of fin 9; l 2 is the length of the middle layer 6; d 1 is the distance between the fin 9 and the first inlet area 1-1; d 2 is the length of the fin 9 (the left and right sides have the same size).

[0028] Since in this embodiment 3 d 1 =3 mm, which is closer to the first inlet area 1-1, thereby reducing the area of ​​the confluence area 4, increasing the confluence intensity, forming a stronger vortex, and continuously producing a turbulent effect, thereby enhancing heat exchange and improving the overall thermal performance of the channel.

[0029] like Figure 7 As shown, in order to verify the heat dissipation advantage of the configuration design of the present invention, in Example 3, the inlet diameter is 0.9 mm, the outlet hydraulic diameter is 0.28 mm, and the base heat flux density is 200 W / cm 2 The numerical simulation diagram of the substrate temperature gradient under the conditions shows that the fin 9 in this example 3 has an obvious effect on regulating the peak temperature of the substrate.

[0030] Embodiment: 4: like Figure 1 and Figure 8As shown, the present invention provides a double-layer microchannel heat sink structure with finned impact jet, comprising an upper microchannel, a lower microchannel and a plurality of partitions, wherein the upper microchannel and the lower microchannel are connected through an intermediate layer 6, and the plurality of partitions are parallel to each other and vertically penetrate the upper microchannel and the lower microchannel to form a plurality of layers of regions; Preferably, the upper microchannel and the lower microchannel have the same height; Preferably, the structure of the present invention is centrally symmetrical and integrally connected; Preferably, the length of the middle layer 6 is 4.1 mm and the height is 0.2 mm; The upper microchannel includes a heat sink top 8, a first inlet area 1-1 is arranged in the central area of ​​the heat sink top 8, a diversion area 2 is arranged at the lower part of the first inlet area 1-1, the diversion area 2 is a hollow structure, and the two sides of the diversion area 2 are guide areas 3; the two side ports of the upper microchannel are respectively provided with a second inlet area 1-2 and a third inlet area 1-3; fins 9 are installed below the heat sink top 8, symmetrically installed on both sides of the first inlet area 1-1, and a confluence area 4 is formed between the fins 9 and the middle layer 6; Preferably, the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 of each layer area are all rectangular, with a length of 0.9 mm and a width of 0.4 mm; Preferably, the angle between the fin 9 and the top 8 of the heat sink is 90°; Preferably, the distance between the fin 9 and the first inlet area 1-1 is 5 mm; Preferably, the fin 9 is a rectangular structure, the height of the fin 9 is 1 mm, and the width is 0.1 mm; The lower microchannel comprises a heat sink base 7 , and two side ports of the lower microchannel are respectively provided with outlet areas 5 .

[0031] like Figure 8 As shown, the present invention also provides a working method of a double-layer microchannel heat sink structure with finned impact jets, comprising the following steps: (1) The coolant enters the heat sink structure through the first inlet area 1-1, the second inlet area 1-2 and the third inlet area 1-3 at the same time; Specifically, the coolant passes through the first inlet area 1-1, enters almost vertically under the interference of the fins 9, impacts the heat sink base 7, generates a strong impact, and then changes the flow direction to form a diversion area 2, then enters the guide area 3, and then enters the confluence area 4; Specifically, the coolant passes through the second inlet area 1-2 and the third inlet area 1-3, and enters the confluence area 4 under the interference of the fins 9; (2) The three coolants merge in the confluence area 4. At this time, a strong liquid turbulence phenomenon is generated, destroying the thermal boundary layer; (3) After mixing, the coolant reconstructs the fluid flow trend and flows to the outlet area 5 to complete the cooling work. As a result, the coolant passes through the interference of the fins 9, generating a continuous turbulence effect, significantly enhancing the flow heat transfer characteristics, helping to improve the double-layer microchannel heat transfer effect and improve the overall heat transfer efficiency of the heat sink system.

[0032] Figure 8 middle, h 1 is the height of the upper microchannel (the heights of the upper and lower channels are the same); h 2 is the height of the middle layer 6 (the left and right sides have the same size); l 1 is the height of fin 9; l 2 is the length of the middle layer 6; d 1 is the distance between the fin 9 and the first inlet area 1-1; d 2 is the length of the fin 9 (the left and right sides have the same size).

[0033] Since in this embodiment 4 d 1 =5 mm, and the flow direction of the coolant is guided by position changes to maximize the cooling potential of the upper coolant on the basis of producing obvious disturbance phenomena, improve the uniformity of the temperature of the heat sink base, and enhance the overall heat dissipation characteristics of the heat sink.

[0034] like Fig. 9 As shown, in order to verify the heat dissipation advantage of the configuration design of the present invention, in Example 4, the inlet diameter is 0.9 mm, the outlet hydraulic diameter is 0.28 mm, and the base heat flux density is 200 W / cm 2 The numerical simulation diagram of the substrate temperature gradient under the conditions shows that the fin 9 in this example 4 has a particularly outstanding effect on regulating the peak temperature of the substrate.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-layer microchannel heat sink structure with finned impact jet, characterized in that: It includes an upper microchannel, a lower microchannel and a plurality of partitions, wherein the upper microchannel and the lower microchannel are connected via an intermediate layer (6), and the plurality of partitions vertically penetrate the upper microchannel and the lower microchannel to form a plurality of regions; The upper microchannel comprises a heat sink top (8), the heat sink top (8) is provided with a first inlet area (1-1), a flow distribution area (2) is provided below the first inlet area (1-1), and both sides of the flow distribution area (2) are flow guide areas (3); the ports on both sides of the upper microchannel are respectively provided with a second inlet area (1-2) and a third inlet area (1-3); a fin (9) is installed below the heat sink top (8), and a confluence area (4) is formed between the fin (9) and the middle layer (6); The lower microchannel comprises a heat sink base (7), and two side ports of the lower microchannel are respectively provided with outlet areas (5).

2. A double-layer microchannel heat sink structure with finned impingement jet according to claim 1, characterized in that: The plurality of partitions are parallel to each other; and the heights of the upper microchannel and the lower microchannel are equal.

3. The double-layer microchannel heat sink structure with finned impingement jet according to claim 1 is characterized in that: The diversion area (2) is a hollow structure.

4. A double-layer microchannel heat sink structure with finned impingement jet according to claim 1, characterized in that: The first inlet area (1-1) is arranged in the central area of ​​the top (8) of the heat sink.

5. The double-layer microchannel heat sink structure with finned impingement jet according to claim 1, characterized in that: The first inlet area (1-1), the second inlet area (1-2) and the third inlet area (1-3) of each layer area are all rectangular, with a length of 0.9 mm and a width of 0.4 mm.

6. The double-layer microchannel heat sink structure with finned impingement jet according to claim 1, characterized in that: The angle between the fin (9) and the top of the heat sink (8) is 90°.

7. The double-layer microchannel heat sink structure with finned impingement jet according to claim 1, characterized in that: The fins (9) are of a rectangular structure; the fins (9) are symmetrically mounted on both sides of the first inlet area (1-1), and the distance between the fins (9) and the first inlet area (1-1) is 1 to 5 mm.

8. A working method of a double-layer microchannel heat sink structure with finned impingement jet, based on the double-layer microchannel heat sink structure with finned impingement jet according to claim 1, characterized in that: The following steps are involved: S1, the coolant enters the heat sink structure through the first inlet area (1-1), the second inlet area (1-2) and the third inlet area (1-3) at the same time; S2, the three cooling liquids merge at the confluence area (4), forming a liquid disturbance phenomenon; S3, the coolant flows out through the outlet area (5), completing the cooling work.

9. The working method of the double-layer microchannel heat sink structure with finned impingement jet according to claim 8, characterized in that: In S1, the cooling liquid enters the heat sink structure through the first inlet area (1-1) as follows: the cooling liquid passes through the first inlet area (1-1), enters the diversion area (2) under the interference of the fins (9), then enters the guide area (3), and then enters the confluence area (4).

10. The working method of the double-layer microchannel heat sink structure with finned impingement jet according to claim 8, characterized in that: In the S1, the cooling liquid enters the heat sink structure through the second inlet area (1-2) and the third inlet area (1-3), specifically: the cooling liquid passes through the second inlet area (1-2) and the third inlet area (1-3), and enters the confluence area (4) under the interference of the fins (9).

Images