A self-circulation heat dissipation device and method for jet impingement enhanced boiling condensation

Abstract

The application belongs to the field of semiconductor device heat dissipation, and particularly relates to a self-circulation heat dissipation device and method of jet impingement enhanced boiling condensation. The heat dissipation device comprises a boiling section, a condensation section, a synthetic jet exciter and a working medium circulation channel. The two ends of the working medium circulation channel are respectively connected with the boiling section and the condensation section to form a working medium circulation loop. The synthetic jet exciter is provided with a lower outlet for connecting with the boiling section and an upper outlet for connecting with the condensation section, and further comprises a flow channel connecting the lower outlet and the upper outlet and a vibrating diaphragm located on the side wall of the flow channel. The alternating jet generated by the synthetic jet exciter and the suction effect actively and cooperatively strengthen the boiling and condensation processes, and the internal flow channel helps to realize efficient and rapid heat transport, so that the heat dissipation efficiency, response speed and working condition adaptability of high heat flux electronic devices are significantly improved under the premise of compact structure and reduced energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of semiconductor device heat dissipation, specifically relating to a self-circulating heat dissipation device and method for jet impact-enhanced boiling condensation. Background Technology

[0002] In recent years, with the rapid development of semiconductor technology, the size of electronic components has been continuously shrinking, and the power density has been continuously increasing. The heat flux density in semiconductor lasers has reached 500 W / m². 2 Future electronic device loads will be highly transient and high-power, with heat flux densities reaching 500-1500 W / m². 2 Traditional heat dissipation devices rely on a single heat transfer mode (such as air cooling or liquid cooling), which suffers from low heat transfer efficiency, high energy consumption, and complex structure. Therefore, developing advanced thermal management technologies for high heat flux density electronic devices has become a challenging problem in fields such as aerospace and integrated circuits. Boiling phase change cooling is an important way to achieve efficient thermal management of high heat flux electronic devices. Efficient boiling heat transfer performance is also of great significance in improving energy system efficiency, safety, and reducing system costs.

[0003] Gravity heat pipes and similar self-circulating cooling devices are simple in structure and low in energy consumption, but they have poor environmental adaptability and lack adjustment capabilities, especially under non-vertical or low liquid filling conditions where heat transfer efficiency drops significantly. Adding external power sources such as pumps or fans increases the device size and system complexity. There is an urgent need for a compact cooling device that combines jet impingement and phase change heat transfer to achieve self-circulation. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a self-circulating heat dissipation device and method for enhanced boiling and condensation by jet impact. By using the alternating jet and suction effect generated by the synthetic jet exciter, the boiling and condensation processes are actively and synergistically enhanced, and efficient heat transport is achieved through its internal flow channels. Thus, under the premise of compact structure and reduced energy consumption, the heat dissipation efficiency, response speed and operating condition adaptability of high heat flux density electronic devices are significantly improved.

[0005] This invention provides a self-circulating heat dissipation device for enhanced boiling and condensation by jet impact, comprising a boiling section, a condensation section, a synthetic jet exciter, and a working fluid circulation channel;

[0006] The two ends of the working fluid circulation channel are respectively connected to the boiling section and the condensation section to form a working fluid circulation loop;

[0007] The synthetic jet exciter is provided with a lower outlet for connecting the boiling section and an upper outlet for connecting the condensing section, and also includes a flow channel connecting the lower outlet and the upper outlet and a vibrating diaphragm located on the side wall of the flow channel.

[0008] The synthetic jet exciter is used to generate pulsed jets, wherein the jet ejected from the lower outlet impacts the boiling surface of the boiling section to disrupt its thermal boundary layer and promote bubble detachment; the jet ejected from the upper outlet impacts the condensation surface of the condensation section to strip the condensate film and promote working fluid reflux; and the synthetic jet exciter connects and acts synchronously on the boiling section and the condensation section through its jet channel, and the synergy of jet impact and periodic suction effect drives and enhances the phase change and self-circulation process of the working fluid.

[0009] Furthermore, the periodic suction effect generated by the synthetic jet exciter is such that the suction cycle at the lower outlet is used to assist in the extraction of steam in the boiling section to suppress film boiling, while the suction cycle at the upper outlet guides the condensate film to converge and fall back in the condensation section.

[0010] Furthermore, the boiling section and the condensation section are connected end to end through two working fluid circulation channels, forming a U-shaped overall structure.

[0011] The synthetic jet exciter is located inside the U-shaped structure.

[0012] Furthermore, the synthetic jet exciter is a synthetic dual-jet exciter;

[0013] Two flow channels are arranged side by side via a partition, and the vibrating diaphragm of the synthetic jet exciter is disposed on the partition.

[0014] There are two lower outlets and two upper outlets.

[0015] Furthermore, the synthetic jet exciter is configured to cause the two lower outlets to operate in alternating phases;

[0016] At any given time, one of the lower outlets is in a jet impact state, and the other lower outlet is in a suction state.

[0017] Furthermore, the lower end of the partition extends downward to form an isolation plate;

[0018] The isolation plate is located between the two lower outlets to prevent fluid interference or self-priming between the two lower outlets.

[0019] Furthermore, the synthetic jet exciter is configured to cause the two upper outlets to operate in alternating phases;

[0020] At any given time, one of the upper outlets is in a jet impact state, and the other upper outlet is in a suction state.

[0021] Furthermore, the liquid level of the working fluid in the flow channel is within the vibrating height range of the vibrating diaphragm.

[0022] Furthermore, the bottom of the boiling section is located at the projection position of the lower outlet, which is the heat source installation position.

[0023] The present invention also provides a self-circulating heat dissipation method for jet impingement-enhanced boiling condensation, using the above-mentioned self-circulating heat dissipation device for jet impingement-enhanced boiling condensation, comprising the following steps:

[0024] The synthetic jet exciter is used to generate a pulsed jet;

[0025] The jet ejected from the lower outlet impacts the boiling surface of the boiling section perpendicularly to disrupt its thermal boundary layer, promote bubble detachment, and inhibit film boiling.

[0026] The jet ejected from the upper outlet impacts the condensation surface of the condensation section perpendicularly to peel off the condensate film and promote the recirculation of the working fluid.

[0027] The phase change and self-circulation process of the working fluid is driven and enhanced by the synergistic effect of jet impact and periodic suction of the synthetic jet exciter.

[0028] The self-circulating heat dissipation device for enhanced boiling condensation by jet impact provided by this invention has the following beneficial effects:

[0029] 1. The jet impact acting on the boiling section directly disrupts the thermal boundary layer, reducing wall superheat; its shear force accelerates bubble detachment and prevents coalescence, maintaining efficient nucleated boiling. Simulations show that the jet can form an "isolation zone" between the heating surfaces, significantly reducing bubble coverage and improving the heat transfer coefficient.

[0030] 2. The jet impact acting on the condensation section enhances liquid film disturbance and peeling, improves the condensation heat transfer coefficient, and at the same time promotes the rapid return of condensate droplets, shortens the cycle, and improves the system response speed.

[0031] 3. The internal flow channel of a single synthetic jet actuator directly connects the boiling section and the condensation section. This flow channel, combined with the basic working fluid circulation channel of the system, integrates active jet disturbance, periodic intake, and passive phase change circulation, forming an integrated heat dissipation loop that combines the overall circulation framework with local active enhancement, thus achieving full-process optimization of boiling, condensation, and intermediate heat exchange processes.

[0032] 4. Based on the aforementioned synergistic heat exchange mechanism, the system's thermal response is significantly accelerated, reaching temperature stability in just about 2 seconds, with a lower overall average temperature. Compared to configurations with independent exciters at both ends (which require approximately 1 minute to stabilize), this device, with its integrated active heat exchange path, avoids heat transport lag and achieves superior steady-state heat dissipation performance.

[0033] 5. The single synthetic jet exciter integrates three functions: "impact-enhanced boiling," "impact-enhanced condensation," and "channel-enhanced overall heat transfer," resulting in concentrated and efficient energy utilization. Its heat transfer coefficient at the heat source surface is improved by approximately 5.8% compared to the dual-exciter configuration, achieving a net improvement in the overall system heat dissipation performance while saving about half of the drive energy consumption.

[0034] 6. The design of a single synthetic jet exciter and integrated flow channel greatly simplifies the internal structure and connection, reduces potential leakage points, improves the compactness and operational reliability of the device, and reduces the complexity of system control. Attached Figure Description

[0035] Figure 1 This is a perspective view of the structure of the self-circulating heat dissipation device for enhanced boiling condensation by jet impact according to the present invention.

[0036] Figure 2 This is a front view of the self-circulating heat dissipation device for jet impact-enhanced boiling condensation according to the present invention.

[0037] Figure 3 This is a side view of the self-circulating heat dissipation device for enhanced boiling condensation by jet impact according to the present invention;

[0038] Figure 4 This is a side view of the self-circulating heat dissipation device for jet impingement enhanced boiling condensation according to the present invention (in the embodiment with an isolation plate).

[0039] Figure 5 A front view of a configuration with one synthetic jet exciter each arranged in the boiling section and the condensation section for comparison;

[0040] Figure 6 This is a bubble isosurface and velocity contour map of the boiling section when the synthetic jet exciter is not activated according to the present invention;

[0041] Figure 7 The isosurface and velocity contour plot of the boiling section of the present invention were obtained when the synthetic jet exciter was in operation for eight cycles.

[0042] Figure 8 The isosurface and velocity contour map of the boiling section of the synthetic jet exciter during sixteen cycles of operation of the present invention;

[0043] Figure 9 This is a graph showing the change in bubble coverage on the heat source surface over time before and after the synthetic jet exciter of this invention is turned on;

[0044] Figure 10 This is a graph showing the change in heat transfer coefficient of the heat source surface over time before and after the synthetic jet exciter of this invention is turned on.

[0045] Figure 11Temperature distribution cloud map inside the device when arranging a synthetic jet exciter configuration according to the present invention; wherein Figure 11 (a) is a temperature distribution contour map 2 seconds after the synthetic jet exciter is turned on. Figure 11 (b) is a temperature distribution cloud map 40 s after the synthetic jet exciter is turned on. Figure 11 (c) is a temperature distribution cloud map 80 s after the synthetic jet exciter is turned on. Figure 11 (d) is a temperature distribution cloud map 120s after the synthetic jet exciter is turned on;

[0046] Figure 12 Temperature distribution cloud maps within the device when two synthetic jet exciter configurations are arranged in a comparative manner; where Figure 12 (a) is a temperature distribution contour map 2 seconds after the synthetic jet exciter is turned on. Figure 12 (b) is a temperature distribution cloud map 40 s after the synthetic jet exciter is turned on. Figure 12 (c) is a temperature distribution cloud map 80 s after the synthetic jet exciter is turned on. Figure 12 (d) is a temperature distribution cloud map 120s after the synthetic jet exciter is turned on;

[0047] Figure 13 This is a graph showing the change of average temperature over time within the apparatus of the present invention and comparative examples.

[0048] Figure 14 The graph shows the change of the convective heat transfer coefficient of the heat source surface in the device of the present invention and comparative examples over time.

[0049] In the diagram, 1-boiling section; 11-heat source installation position; 2-condensation section; 3-synthetic jet exciter; 31-lower outlet; 32-upper outlet; 33-flow channel; 34-vibrating diaphragm; 35-partition plate; 36-isolation plate; 37-working fluid; 4-working fluid circulation channel; 5-heat source. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0052] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0055] like Figures 1-4 As shown, the present invention provides a self-circulating heat dissipation device for enhanced boiling and condensation by jet impact, comprising a boiling section 1, a condensation section 2, a synthetic jet exciter 3, and a working fluid circulation channel 4.

[0056] The boiling section 1, located at the bottom of the device, is used to install the heat source 5 (such as a semiconductor device). The inner surface of the boiling section is the boiling surface, where the working fluid 37 absorbs heat and undergoes a boiling phase change. The condensation section 2, located at the top of the device, has an inner surface that is a condensation surface, where steam condenses and releases heat. The two ends of the working fluid circulation channel 4 are connected to the boiling section 1 and the condensation section 2 respectively, forming a working fluid circulation loop; enabling the self-circulating flow of the working fluid 37 (such as deionized water, fluorinated liquid, etc.).

[0057] The synthetic jet exciter 3 is provided with a lower outlet 31 for connecting the boiling section 1 and an upper outlet 32 ​​for connecting the condensing section 2, and also includes a flow channel 33 connecting the lower outlet 31 and the upper outlet 32 ​​and a vibrating diaphragm 34 located on the side wall of the flow channel 33.

[0058] The synthetic jet actuator 3 is used to generate pulsed jets. The jet ejected from the lower outlet 31 impacts the boiling surface of the boiling section 1 to disrupt its thermal boundary layer and promote bubble detachment. The jet ejected from the upper outlet 32 ​​impacts the condensation surface of the condensation section 2 to strip the condensate film and promote the reflux of the working fluid 37. The synthetic jet actuator 3 connects and acts synchronously on the boiling section 1 and the condensation section 2 through its jet channel. The synergy of jet impact and periodic suction drives and enhances the phase change and self-circulation process of the working fluid 37. That is, the flow channel 33 of the synthetic jet actuator 3 constitutes an active, highly turbulent heat exchange path. Under the high-frequency vibration of the vibrating diaphragm 34, the gas-liquid two-phase working fluid 37 in this channel is subjected to intense disturbance and mixing, significantly enhancing the convective heat transfer and mass exchange between the high-temperature working fluid 37 (or steam) in the boiling section and the low-temperature working fluid 37 (or condensate) in the condensation section. This makes the synthetic jet exciter 3 not only an impact source, but also a heat and mass exchange enhancement device, realizing the dynamic coordination of the boiling process and the condensation process in the same physical space and the rapid redistribution of heat.

[0059] The self-circulating heat dissipation device for enhanced boiling condensation by jet impact provided by this invention has the following beneficial effects:

[0060] 1. The jet impact acting on boiling section 1 directly disrupts the thermal boundary layer, reducing wall superheat; its shear force accelerates bubble detachment and prevents coalescence, maintaining efficient nucleated boiling. Simulations show that the jet can form an "isolation zone" between the heating surfaces, significantly reducing bubble coverage and improving the heat transfer coefficient.

[0061] 2. The jet impact acting on the condensation section 2 enhances the disturbance and peeling of the liquid film, improves the condensation heat transfer coefficient, and at the same time promotes the rapid return of condensed droplets, shortens the cycle, and improves the system response speed.

[0062] 3. The flow channel 33 inside the single synthetic jet exciter 3 directly connects the boiling section 1 and the condensation section 2. This flow channel 33, combined with the working fluid circulation channel 4 of the system foundation, integrates active jet disturbance, periodic intake, and passive phase change circulation to form an integrated heat dissipation loop that combines the overall circulation framework with local active enhancement, thereby achieving full-process optimization of boiling, condensation, and intermediate heat exchange processes.

[0063] 4. Based on the aforementioned synergistic heat exchange mechanism, the system's thermal response is significantly accelerated, reaching temperature stability in just about 2 seconds, with a lower overall average temperature. Compared to configurations with independent exciters at both ends (which require approximately 1 minute to stabilize), this device, with its integrated active heat exchange path, avoids heat transport lag and achieves superior steady-state heat dissipation performance.

[0064] 5. The single synthetic jet exciter 3 integrates three functions: "impact-enhanced boiling," "impact-enhanced condensation," and "channel-enhanced overall heat transfer," resulting in concentrated and efficient energy utilization. Its heat transfer coefficient at the heat source surface is improved by approximately 5.8% compared to the dual-exciter configuration, achieving a net improvement in the overall system heat dissipation performance while saving about half of the drive energy consumption.

[0065] 6. The design of a single synthetic jet exciter 3 and an integrated flow channel 33 greatly simplifies the internal structure and connection, reduces potential leakage points, improves the compactness and operational reliability of the device, and reduces the complexity of system control.

[0066] In one embodiment, the periodic suction effect generated by the synthetic jet exciter 3 is such that the suction cycle of the lower outlet 31 is used to assist in the extraction of steam in the boiling section 1 to suppress film boiling, and the suction cycle of the upper outlet 32 ​​guides the condensate film to converge and fall back in the condensation section 2.

[0067] In this embodiment, the lower outlet 31 generates a momentary negative pressure during the suction cycle, which actively draws in steam accumulated near the heating surface. This directly intervenes in the boiling process, effectively preventing the steam film from covering and insulating the heating surface, thereby significantly suppressing film boiling and ensuring the maintenance of a highly efficient nucleate boiling state. The periodic suction effect of the upper outlet 32 ​​can generate directional flow guidance on the condensation surface. This helps to promote the convergence of dispersed condensate droplets and pulls the liquid film to move along the wall towards the lower outlet 31, thereby accelerating the stripping and return of condensate to the boiling section, improving the overall circulation rate and condensation efficiency of the working fluid 37.

[0068] In one embodiment, the boiling section 1 and the condensing section 2 are connected end to end through two working fluid circulation channels 4, forming a square-shaped overall structure.

[0069] The synthetic jet exciter 3 is disposed inside the U-shaped structure.

[0070] In this embodiment, the U-shaped structure ensures that the loop formed by the working fluid circulation channel 4 tightly surrounds the internal synthetic jet actuator 3. This layout shortens the flow path of the working fluid 37 from the boiling section 1 to the condensing section 2, while ensuring that the jetting and suction effects of the synthetic jet actuator 3 can cover the boiling and condensing surfaces with the shortest distance and highest efficiency, reducing the flow and resistance of heat transfer.

[0071] Furthermore, the arrangement of the U-shaped symmetrical structure and the central synthetic jet exciter 3 facilitates the rapid and uniform diffusion of heat within the device, preventing localized overheating. Simultaneously, the integrated enclosure structure enhances the device's mechanical stability, reduces potential leakage points and thermal resistance caused by the connection of multiple components, and improves long-term operational reliability.

[0072] In one embodiment, the synthetic jet exciter 3 is a synthetic dual-jet exciter;

[0073] The two flow channels 33 are arranged in parallel by the partition plate 35. The vibrating diaphragm 34 of the synthetic jet exciter 3 is arranged on the partition plate 35. At this time, the two independent flow channels 33 are driven alternately by a vibrating diaphragm 34. During operation, the two flow channels 33 alternately spray and suck under the reciprocating motion of the vibrating diaphragm 34.

[0074] There are two lower outlets 31 and two upper outlets 32.

[0075] In this embodiment, a vibrating diaphragm 34 drives two flow channels 33 to work alternately, achieving continuous and uninterrupted output of jet pulses. When one channel is in the jetting stage, the other channel is in the suction or preparation stage. This working mode forms a continuous and alternating strong shear flow field on the surface of the boiling and condensing sections, effectively preventing the periodic decay of the flow field and temperature field, and providing continuous and stable active enhancement for phase change heat transfer.

[0076] In another embodiment, the synthetic jet exciter 3 has a single flow channel 33, a lower outlet 31, and an upper outlet 32, in which case the vibrating diaphragm 34 is disposed on the side wall of the flow channel 33.

[0077] In one embodiment, the synthetic jet exciter 3 is configured to cause the two lower outlets 31 to operate in alternating phases;

[0078] At any given time, one of the lower outlets 31 is in a jet impact state, and the other lower outlet 31 is in a suction state.

[0079] In this embodiment, the two alternately operating lower outlets 31 form complementary flow fields on the surface of the boiling section. The lower outlet 31 in the impact state directly disrupts the thermal boundary layer and shears the bubbles; simultaneously, the lower outlet 31 in the suction state generates local negative pressure in the adjacent area, actively drawing in and removing steam. This combination of "impact and suction" not only more effectively prevents the local accumulation of steam and the formation of film boiling, but also accelerates the detachment and migration of impacted bubbles through pressure difference, achieving deeper and more efficient active control of the boiling process.

[0080] Furthermore, because the two lower outlets 31 operate alternately, the surface of the boiling section is always subjected to active fluid action (either impact or suction), avoiding the periodic and drastic fluctuations in the flow field and temperature field that may be caused by traditional intermittent impact. This provides a continuous and stable active enhancement environment for boiling heat transfer, which helps maintain a higher and more stable nucleate boiling heat transfer coefficient and prevents instantaneous heat transfer deterioration caused by flow field interruption.

[0081] In one embodiment, the lower end of the partition 35 extends downward to form a partition 36;

[0082] The isolation plate 36 is located between the two lower outlets 31 to prevent fluid interference or self-priming between the two lower outlets 31.

[0083] In this embodiment, the baffle plate 36 forms a physical barrier between the two lower outlets 31. This barrier effectively blocks the direct interference between the opposite-phase flow fields (jet and suction) generated by the two lower outlets 31 within the boiling section, preventing the high-speed jet ejected from one outlet from being prematurely drawn in, dispersed, or weakened by the instantaneous negative pressure of the other outlet. This ensures the independence and integrity of the effect of each outlet on the boiling surface within its operating phase. Furthermore, as a flow guiding structure within the boiling section 1, the baffle plate 36 helps to regulate the alternating impact flow and suction flow within their respective, more clearly defined regions, resulting in a clearer and more orderly flow field structure on the boiling surface. This not only enhances the targeted effects of "impact-induced boundary layer disruption" and "steam removal through suction," but also facilitates the formation of a more stable and predictable return and replenishment path for the working fluid 37, thereby improving the controllability and heat transfer stability of the entire boiling process.

[0084] In a preferred embodiment, the isolation plate 36 is spaced from the bottom of the boiling section 1. In this embodiment, the space at the bottom of the isolation plate 36 physically isolates the functional areas of the two lower outlets 31 while providing a connecting bottom channel for the working fluid 37 at the bottom of the boiling section 1. This allows the condensate returning from the condensation section 2 and the liquid working fluid 37 of the boiling section 1 itself to flow laterally and be replenished at the bottom, avoiding the possibility of localized drying or backflow blockage of the working fluid 37 due to complete isolation, ensuring the microscopic integrity of the self-circulation loop, and improving the long-term stability of the system.

[0085] In one embodiment, the synthetic jet exciter 3 is configured to cause the two upper outlets 32 to operate in alternating phases;

[0086] At any given time, one of the upper outlets 32 is in a jet impact state, and the other upper outlet 32 ​​is in a suction state.

[0087] In this embodiment, the two alternately operating upper outlets 32 form complementary flow fields on the surface of the condensation section 2. The outlet in the impact state directly peels off the condensate film; simultaneously, the outlet in the suction state generates directional suction in the adjacent area, guiding the peeled or aggregated droplets towards the upper outlet 32. This combination of impact and suction not only enhances the initial peeling effect of the liquid film but also actively promotes the aggregation and directional movement of droplets, significantly accelerating the removal and recirculation of condensate.

[0088] In one embodiment, the liquid level of the working fluid 37 in the flow channel 33 is within the vibratory height range of the vibrating diaphragm 34.

[0089] In this embodiment, the liquid level of the working fluid 37 is maintained within the movable range of the vibrating diaphragm 34, ensuring that the vibrating diaphragm 34 can directly perform work on the liquid working fluid 37 throughout the vibration process, avoiding the "empty vibration" phenomenon caused by excessive damping due to excessively high liquid level or "empty vibration" due to excessively low liquid level. This allows the driving electrical energy to be efficiently converted into the kinetic energy and disturbance potential energy of the working fluid 37, thereby maximizing the intense mixing and heat transfer enhancement of the working fluid 37 within the flow channel 33.

[0090] In one embodiment, the bottom of the boiling section 1 is located at the projection position of the lower outlet 31 as the heat source mounting position 11.

[0091] In this embodiment, the heat source mounting position 11 is positioned within the vertical projection area of ​​the lower outlet 31, ensuring that the jet and suction effect generated by the synthetic jet exciter 3 can directly and centrally act on the boiling surface directly above the heat source 5. This positional correspondence allows the actively enhanced energy to be precisely delivered to the region of highest heat flux density, maximizing the disruption of the thermal boundary layer there and enhancing bubble detachment, thus significantly improving the targeting of cooling and heat transfer efficiency.

[0092] The present invention also provides a self-circulating heat dissipation method for jet impingement-enhanced boiling condensation, using the above-mentioned self-circulating heat dissipation device for jet impingement-enhanced boiling condensation, comprising the following steps:

[0093] The synthetic jet exciter 3 is used to generate a pulsed jet;

[0094] The jet ejected from the lower outlet 31 impacts the boiling surface of the boiling section 1 perpendicularly to disrupt its thermal boundary layer, promote bubble detachment, and inhibit film boiling.

[0095] The jet ejected from the upper outlet 32 ​​is made to vertically impact the condensation surface of the condensation section 2 to peel off the condensate film and promote the reflux of the working fluid 37.

[0096] The phase change and self-circulation process of the working fluid 37 are driven and enhanced by the synergistic effect of the jet impact and periodic suction of the synthetic jet exciter 3.

[0097] Taking the installation of three heat sources 5 on heat source mounting position 11 as an example, numerical simulation analysis of the present invention is performed. The bubble isosurface and velocity cloud map of boiling section 1 when the synthetic jet exciter 3 is not turned on are shown in the figure. Figure 6As shown, the bubbles from the three heat sources 5 have attracted each other and coalesced, forming large bubbles. This inhibits gas-liquid exchange at the bottom, leading to deterioration of heat transfer. After eight cycles of activating the synthetic jet exciter 3, as... Figure 7 As shown, under the impact of the jet, the coalescence of the bubbles in the middle and right sides has been broken, the volume of the detached bubbles has decreased, and the connection between the bubbles in the middle and left sides also shows a tendency to break. After sixteen cycles of the synthetic jet exciter being turned on, as shown... Figure 8 As shown, the jet has now fully diffused into the lower flow field, forming an "isolation zone" between the three heating surfaces, which effectively prevents the generation of large bubbles and promotes the detachment of bubbles.

[0098] like Figure 9 As shown, after the synthetic jet exciter 3 is turned on, the bubble coverage on the three heating surfaces decreases significantly and gradually stabilizes during subsequent working cycles of the synthetic jet exciter 3. Figure 10 As shown, after the synthetic jet exciter 3 is turned on, the heat transfer coefficient of the heating surface significantly increases and gradually stabilizes. This indicates that during the boiling process, the detachment of bubbles carries away most of the heat, and the synthetic jet exciter 3 can effectively break the vapor film on the heating surface, promote the reflux of the cooling working fluid, and prevent heat transfer deterioration.

[0099] To demonstrate the advantages of this device configuration, the following configurations are shown: one with a single synthetic jet actuator 3 and another with one synthetic jet actuator 3 in each of the boiling section 1 and the condensation section 2 (see reference). Figure 5 As a comparative example, numerical simulations were performed to illustrate the operation of both the present invention and the comparative example. Figure 11 , Figure 12 It can be seen that the single synthetic jet exciter configuration 3 of this invention can quickly stabilize the temperature field in only 2 seconds, while the two synthetic jet exciter configurations in the comparative example require about one minute to achieve temperature field stabilization. Figure 13 As shown, the single synthetic jet exciter configuration of the present invention not only has a faster response time, but also results in a lower average device temperature and better heat dissipation; as Figure 14 As shown, the single synthetic jet exciter 3 configuration of the present invention has a better heat exchange effect for the heat source 5, with a higher convective heat transfer coefficient, and the heat exchange capacity is improved by about 5.8% compared with the two synthetic jet exciter 3 configurations in the comparative example. It achieves the effect of "twice the result with half the effort" while saving half the energy consumption.

[0100] The above description is merely an embodiment and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations, modifications, or alterations to the technical solutions of the present invention without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A self-circulating heat sink device of jet impingement enhanced boiling condensation, characterized in that, It comprises a boiling section (1), a condensing section (2), a synthetic jet actuator (3) and a working medium circulation channel (4); The boiling section (1) and the condensing section (2) are connected head to tail through two working medium circulation channels (4) to form a working medium circulation loop, which together enclose an overall structure in the shape of a mouth-shaped Chinese character; The synthetic jet actuator (3) is provided with a lower outlet (31) for connecting the boiling section (1) and an upper outlet (32) for connecting the condensing section (2), and further comprises a flow channel (33) connecting the lower outlet (31) and the upper outlet (32) and a vibrating diaphragm (34) located on the side wall of the flow channel (33); The synthetic jet actuator (3) is used to generate pulsed jet flow, wherein the jet flow ejected from the lower outlet (31) impacts the boiling surface of the boiling section (1) to destroy the thermal boundary layer and promote bubble detachment, and the jet flow ejected from the upper outlet (32) impacts the condensing surface of the condensing section (2) to peel off the condensate film and promote the backflow of the working medium (37); and the synthetic jet actuator (3) is connected through its jet flow channel and simultaneously acts on the boiling section (1) and the condensing section (2), and the synergy of jet flow impact and periodic suction drives and strengthens the phase change and self-circulation process of the working medium (37).

2. The self-circulating heat sink device of claim 1, wherein the jet impingement enhanced boiling condensation is characterized by, The periodic suction effect generated by the synthetic jet actuator (3) is used to assist in pumping steam in the boiling section (1) to suppress film boiling in the suction period of the lower outlet (31), and to guide the condensate film to converge and fall back in the condensing section (2) in the suction period of the upper outlet (32).

3. The self-circulating heat sink device of jet impingement enhanced boiling condensation according to claim 1 or 2, wherein The synthetic jet actuator (3) is a synthetic double jet actuator; The flow channel (33) is provided with two parallel flow channels (33) through a partition (35), and the vibrating diaphragm (34) of the synthetic jet actuator (3) is arranged on the partition (35); The lower outlet (31) is provided with two lower outlets (31), and the upper outlet (32) is provided with two upper outlets (32).

4. The self-circulating heat sink device for jet impingement enhanced boiling condensation according to claim 3, wherein The synthetic jet actuator (3) is configured to make the two lower outlets (31) work in an alternating phase; At any moment, one of the lower outlets (31) is in a jet flow impact state, and the other lower outlet (31) is in a suction state.

5. The self-circulating heat sink device for jet impingement enhanced boiling condensation according to claim 4, wherein The lower end of the partition (35) extends downward to form an isolation plate (36); The isolation plate (36) is located between the two lower outlets (31) to prevent fluid interference or self-suction phenomenon between the two lower outlets (31).

6. The self-circulating heat sink device for jet impingement enhanced boiling condensation according to claim 3, wherein The synthetic jet actuator (3) is configured to make the two upper outlets (32) work in an alternating phase; At any moment, one of the upper outlets (32) is in a jet flow impact state, and the other upper outlet (32) is in a suction state.

7. The self-circulating heat sink device for jet impingement enhanced boiling condensation according to claim 1, wherein The liquid level of the working medium (37) in the flow channel (33) is within the vibratable height range of the vibrating diaphragm (34).

8. The self-circulating heat sink device of jet impingement enhanced boiling condensation according to any one of claims 1, 2, 4-7, wherein The bottom of the boiling section (1) is located at the projection position of the lower outlet (31), which is a heat source installation position (11).

9. A self-circulating heat dissipation method of jet impingement enhanced boiling condensation, characterized in that, The self-circulation heat dissipation device using the jet impingement enhanced boiling condensation as claimed in any one of claims 1-8, comprising the following steps: generating pulsed jet flow by using the synthetic jet actuator (3); making the jet flow ejected from the lower outlet (31) vertically impinge on the boiling surface of the boiling section (1) to destroy its thermal boundary layer, promote bubble departure and inhibit film boiling; making the jet flow ejected from the upper outlet (32) vertically impinge on the condensing surface of the condensing section (2) to peel off the condensate film and promote the working medium (37) backflow; driving and enhancing the phase change and self-circulation process of the working medium (37) through the synergy of jet impingement and periodic suction of the synthetic jet actuator (3).

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