CN113175836A - Spiral bionic micro-channel heat exchanger for cooling electronic device - Google Patents
Spiral bionic micro-channel heat exchanger for cooling electronic device Download PDFInfo
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- CN113175836A CN113175836A CN202110420698.2A CN202110420698A CN113175836A CN 113175836 A CN113175836 A CN 113175836A CN 202110420698 A CN202110420698 A CN 202110420698A CN 113175836 A CN113175836 A CN 113175836A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
- F28D2021/0029—Heat sinks
Abstract
A spiral bionic microchannel structure for cooling an electronic device comprises a microchannel substrate, wherein a plurality of bionic spiral microchannels which are centrosymmetric relative to a fluid inlet are distributed on the microchannel substrate, fluid outlets of the bionic spiral microchannels are distributed on the same circumference, fluid enters the bionic spiral microchannels from the fluid inlet, the flowing direction is constantly changed in the flowing process, disturbance is increased, the development of a thermal boundary layer is destroyed, the mixing of cold and hot fluid in the channel is enhanced by the centrifugal effect, and the cold and hot fluid finally flows out from the fluid outlets. The structure can be used for forming radiators in various forms, the mixing of cold and hot fluid in the micro-channel is effectively enhanced, the heat exchange efficiency and the temperature uniformity of the micro-channel radiator are improved, the development of a fluid thermal boundary layer in the micro-channel is damaged, and the heat exchange capacity of the radiator is improved.
Description
Technical Field
The invention belongs to the technical field of heat exchange enhancement, and particularly relates to a spiral bionic micro-channel structure for cooling an electronic device and a radiator adopting the structure.
Background
With the rapid development of microelectronic technology, the integration level of electronic chip elements is further improved, so that the power consumption of the chip is greatly increased, and the average heat flow density is close to 500W/cm2The heat dissipation problem seriously affects the electronThe service life of the equipment and further miniaturization. One of the solutions to the existing heat dissipation problem of electronic chips is to cool the chip by using the characteristics of large specific surface area and high heat transfer coefficient of a microchannel heat sink, thereby improving the cooling capacity of the system and the integration level of original components.
The prior micro-channel radiator can be divided into a traditional micro-channel and a manifold type micro-channel according to the flowing direction of working media. The traditional micro-channel radiator has the advantages that all channels are parallel to each other, the inlet arrangement and the micro-channel flow are in the same direction, the use is flexible, and the processing is simple; however, because the temperature of the fluid in the channel is continuously raised along the channel direction, the temperature of the fluid at the rear part is obviously higher than that at the front part, the temperature uniformity is poor, the problem of local hot spots exists, the working safety and the service life of an electronic device are influenced, and meanwhile, because the flow in the parallel channels belongs to simple one-dimensional flow, disturbance is lacked, the development of an internal thermal boundary layer is fast, and the heat exchange coefficient is relatively low. The manifold type microchannel converts a traditional microchannel into a multi-section short channel from a single-section long channel, and the inlet position is vertical to the flow direction, so that the length of each channel is shortened, the development of a boundary layer is reduced, and the heat exchange coefficient of the radiator is improved; however, because the manifold-type microchannel needs to be provided with a plurality of shunting and converging passages, the system maintenance and processing and manufacturing costs are increased, and meanwhile, because the manifold-type microchannel is provided with more shunting ports, the problem of non-uniform distribution of cooling working media is more obvious, and the problem of hot spots can be caused due to different flow rates of the working media in each flow channel, so that the normal work of an electronic device is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a spiral bionic micro-channel structure for cooling an electronic device and a radiator adopting the structure, and by considering the enhancement of heat exchange and the improvement of temperature uniformity, through changing the inlet and outlet directions of a working medium and the design of the bionic spiral micro-channel, the fluid mixing in the channel is enhanced, and the heat exchange efficiency of the radiator is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a spiral bionic micro-channel structure for cooling an electronic device is characterized by comprising a micro-channel substrate 1, wherein a plurality of bionic spiral micro-channels 3 which are centrosymmetric relative to a fluid inlet 2 are distributed on the micro-channel substrate 1, fluid outlets 4 of the bionic spiral micro-channels 3 are distributed on the same circumference, fluid enters the bionic spiral micro-channels 3 from the fluid inlet 2, the flowing direction is continuously changed in the flowing process, disturbance is increased, the development of a thermal boundary layer is damaged, the mixing of cold and hot fluid in the channels is enhanced by the centrifugal action, and the fluid flows out from the fluid outlets 4.
The bionic object of the bionic spiral micro-channel 3 is in the shape of a spiral molded line structure of a sunflower petal, and the molded line structure of the bionic spiral micro-channel is composed of a front development section, a middle acceleration section and a rear outlet section.
The ratio t/H of the thickness t of the micro-channel matrix 1 to the height H of the bionic spiral micro-channel 3 is 0.10-0.25; the ratio H/H of the height H of the bionic spiral micro-channel 3 to the channel interval H is 4.80-6.50; the fluid outlet 4 is connected with the outer circumference of the micro-channel matrix 1, the molded line at the outlet is along the tangential direction of the outer circumference of the micro-channel matrix 1, the tail end of the molded line and the micro-channel matrix 1 form a cambered surface structure in a surrounding mode, the fluid inlet 2 is a round hole, the bionic spiral micro-channel 3 is arranged around the fluid inlet 2 at equal intervals, and the diameter d of the fluid inlet 21The ratio D to the diameter D of the microchannel base body 11/D＝0.10～0.20。
The fluid outlets 4 are distributed on the same circumference of the edge of the microchannel matrix 1.
The invention also claims a radiator adopting the spiral bionic micro-channel structure for cooling the electronic device.
A top plate 6 with a fluid inlet 5 is closely arranged above the bionic spiral micro-channel 3, and the fluid inlet 5 is correspondingly communicated with the fluid inlet 2.
The top surface of the top plate 6 is provided with an inlet channel 7, the bottom of the bionic spiral micro-channel 3 is connected with the micro-channel matrix 1, the top of the bionic spiral micro-channel is attached to the bottom surface of the plate 6, the fluid inlet 5 is correspondingly communicated with the fluid inlet 2, and the inlet channel 7 is communicated with the fluid inlet 5.
The top surface of the top plate 6 is provided with a plurality of strengthening channels 8 for filling phase-change materials, and the top of the plate 6 is attached to the cover plate 9.
The spiral bionic micro-channel structure is provided with a plurality of spiral bionic micro-channel structures on the same micro-channel substrate 1.
Compared with the prior art, the design of the bionic spiral micro-channel structure provided by the invention enables the flow direction of fluid in the micro-channel to be changed continuously in the flow process, the impact of the fluid on the channel is enhanced, the mixing of cold and hot fluid in the micro-channel is effectively strengthened, the heat exchange efficiency and the temperature uniformity of the micro-channel radiator are improved, meanwhile, the development of a fluid thermal boundary layer in the micro-channel is damaged, and the critical heat flow density of the radiator is improved. Its advantages include: high heat exchange efficiency, good temperature uniformity, wide applicable working conditions, low manufacturing cost and the like.
Drawings
FIG. 1 is a schematic diagram of a sunflower structure and a spiral bionic micro-channel structure.
FIG. 2 is a schematic structural diagram of a spiral bionic micro-channel of the present invention.
FIG. 3 is a dimension indicating diagram (top view) of the spiral biomimetic micro-channel structure of the present invention.
FIG. 4 is a diagram (cross-section) showing the dimension of the spiral bionic micro-channel structure according to the present invention.
FIG. 5 is a schematic view of the profile of the bionic spiral micro-channel of the present invention.
Fig. 6 is a schematic structural view of a spiral bionic micro-channel heat sink according to an embodiment of the present invention (a single spiral bionic micro-channel structure).
Fig. 7 is a schematic structural view of a spiral bionic micro-channel heat sink according to an embodiment of the invention (three spiral bionic micro-channel structures).
FIG. 8 is a graph comparing the cooling effect of the rectangular micro-channel of the present invention and the conventional rectangular micro-channel, wherein (a), (b) and (c) are the velocity distribution, temperature distribution and cooling effect of the conventional cold plate and the spiral bionic micro-channel at the same mass flow rate, respectively.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The micro-channel structure related to the present invention is inspired by the spiral line arrangement of the sunflower fruits, as shown in fig. 1, so that the fruits on each line can uniformly draw nutrients from the stem. Inspired by this, the setting of spiral microchannel structure can make the fluid evenly shunt to each passageway for radiator temperature distribution is more even.
Based on this, referring to fig. 2, fig. 3 and fig. 4, the present invention provides a spiral bionic micro-channel structure for cooling an electronic device, comprising a micro-channel substrate 1, wherein the micro-channel substrate 1 is a smooth compact flat plate structure, a plurality of bionic spiral micro-channels 3 are distributed on the micro-channel substrate 1, the bionic spiral micro-channels 3 are centrosymmetric with respect to a fluid inlet 2, a ratio t/H of a thickness t of the micro-channel substrate 1 to a height H of the bionic spiral micro-channels 3 is preferably selected to be 0.10 to 0.25, and a ratio H/H of the height H of the bionic spiral micro-channels 3 to a channel interval H is preferably selected to be 4.80 to 6.50.
In the invention, the fluid inlet 2 is a circular structure and concentric with the projection of the bionic spiral micro-channel 3 on the micro-channel substrate 1, the inlet end of each bionic spiral micro-channel 3 is arranged around the fluid inlet 2, and the diameter d of the inlet end is1The ratio D to the diameter D of the microchannel base body 11The value of/D is preferably 0.10 to 0.20. The fluid enters the fluid inlet 2 perpendicular to the micro-channel matrix 1 and then enters the bionic spiral micro-channels 3 parallel to the micro-channel matrix 1.
The fluid outlets 4 of the bionic spiral micro-channels 3 are distributed on the same circumference of the edge of the micro-channel matrix 1, namely, the fluid outlets 4 are connected with the outer circumference of the micro-channel matrix 1, preferably, the molded lines at the outlets of the bionic spiral micro-channels 3 can be along the tangential direction of the outer circumference of the micro-channel matrix 1, and the tail ends of the molded lines and the micro-channel matrix 1 can form an arc surface structure.
The bionic spiral micro-channels 3 are equidistantly distributed around the middle fluid inlet 2, referring to fig. 5, in the coordinate system in fig. 5, the molded line structure of each bionic spiral micro-channel 3 is composed of a front development section, a middle acceleration section and a rear outlet section, and an optional mathematical expression is as follows:
outer arc:
inner arc:
the spiral bionic micro-channel structure can form radiators in various forms, can be used for replacing a conventional cold plate, and can also be directly used as a radiator.
In one embodiment of the present invention shown in fig. 6, a plate 6 with a fluid inlet 5 is disposed closely above the spiral microchannel 3, specifically, the bottom of the bionic spiral microchannel 3 is connected to the microchannel substrate 1, and the top is attached to the bottom surface of the plate 6, wherein the fluid inlet 5 is correspondingly communicated with the fluid inlet 2.
Further, the top surface of the top plate 6 can be provided with an inlet channel 7, the fluid inlet 5 is correspondingly communicated with the fluid inlet 2, the inlet channel 7 is communicated with the fluid inlet 5, and the fluid flows along a line of the inlet channel 7, the fluid inlet 5, the fluid inlet 2, the bionic spiral micro-channel 3 and the fluid outlet 4.
Furthermore, the top surface of the top plate 6 is also provided with a plurality of strengthening channels 8 for filling phase change materials, and a jointed cover plate 9 can be arranged on the top of the plate 6 (the smoothness of the inlet channel 7 and the strengthening channels 8 needs to be ensured).
In another embodiment of the present invention, illustrated in fig. 7, there are 3 spiral biomimetic micro-channel structures on the same micro-channel substrate 1. The overall size of the radiator is as follows: 380mm long, 150mm wide and 12mm high. Three of the channels arranged on the top of the plate 6 are inlet channels 7, the other channels communicated with the fluid inlet 5 are strengthening channels 8, phase-change materials are filled in the channels, and liquid flows into the radiator from the three fluid inlets 5, passes through three spiral simulation micro-channel structures and flows out from the fluid outlet 4. The thickness t of an upper micro-channel substrate 1 and a lower micro-channel substrate 1 of the spiral bionic micro-channel structure is 1mm, the height H of the bionic spiral micro-channel 3 is 6mm, and the diameter d of the fluid inlet 2116mm and the diameter D of the outer edge of the spiral microchannel is 124 mm.
In the embodiment shown in fig. 7, under the condition that a 90W heat source is additionally provided to the microchannel substrate 1, simulation calculation is performed on the spiral simulation microchannel structure and the conventional rectangular cold plate with the same size as the spiral simulation microchannel structure, and the result shows that: under the single-phase water-cooling condition, traditional rectangle microchannel is compared to the spiral microchannel, and the backplate temperature has reduced more than 3.6 ℃ on average, and the temperature is more even. The calculation results are shown in (a), (b) and (c) of fig. 8. In practical application, the spiral simulation micro-channel structure can also be used as an independent micro-channel heat dissipation unit, and heat dissipation elements such as an electronic chip, a lithium battery and the like can be attached to the micro-channel substrate 1.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a bionical microchannel structure of spiral for electron device cooling, its characterized in that includes microchannel base member (1), it has many bionical spiral microchannel (3) about fluid entry (2) centrosymmetry to distribute on microchannel base member (1), and fluid outlet (4) of each bionical spiral microchannel (3) distribute on same circumference, and fluid gets into from fluid entry (2) bionical spiral microchannel (3), and the flow direction constantly changes in the flow in-process, increases the disturbance, destroys the thermal boundary layer development to utilize the centrifugal action that receives to strengthen the inside cold and hot fluid mixing of passageway, flow out from fluid outlet (4) at last.
2. The spiral bionic micro-channel structure for cooling electronic devices according to claim 1, characterized in that the bionic object of the bionic spiral micro-channel (3) is in the shape of a spiral-shaped line structure of sunflower petals, and the line structure of the bionic spiral micro-channel consists of a front development section, a middle acceleration section and a rear outlet section.
3. The spiral biomimetic microchannel structure for electronic device cooling according to claim 2, wherein the biomimetic spiral microchannel (3) has an expression:
outer arc:
inner arc:
4. the spiral bionic microchannel structure for cooling the electronic device according to claim 1, 2 or 3, wherein the ratio t/H of the thickness t of the microchannel matrix (1) to the height H of the bionic spiral microchannel (3) is 0.10-0.25; the ratio H/H of the height H of the bionic spiral micro-channel (3) to the channel interval H is 4.80-6.50; the fluid outlet (4) is connected with the outer circumference of the micro-channel matrix (1), the molded line at the outlet is along the tangential direction of the outer circumference of the micro-channel matrix (1), the tail end of the molded line and the micro-channel matrix (1) enclose to form a cambered surface structure, the fluid inlet (2) is a round hole, the bionic spiral micro-channel (3) is arranged around the fluid inlet (2) in an equidistance mode, and the diameter d of the fluid inlet (2) is1The ratio D to the diameter D of the microchannel base body (1)1/D＝0.10～0.20。
5. The spiral biomimetic microchannel structure for electronic device cooling according to claim 1, wherein the fluid outlets (4) are distributed on the same circumference of the edge of the microchannel substrate (1).
6. A heat sink using the spiral biomimetic micro-channel structure for electronic device cooling as claimed in any of claims 1 to 5.
7. The heat sink according to claim 6, wherein a top plate (6) with a fluid inlet (5) is closely arranged above the bionic spiral microchannel (3), and the fluid inlet (5) is correspondingly communicated with the fluid inlet (2).
8. The heat sink as recited in claim 7, wherein the top surface of the top plate (6) is provided with an inlet channel (7), the bottom of the bionic spiral micro-channel (3) is connected with the micro-channel substrate (1), the top of the bionic spiral micro-channel is attached to the bottom surface of the plate (6), the fluid inlet (5) is correspondingly communicated with the fluid inlet (2), and the inlet channel (7) is communicated with the fluid inlet (5).
9. The heat sink as claimed in claim 8, wherein the top plate (6) is provided with a plurality of reinforced channels (8) for filling phase change material, and the top of the plate (6) is attached to the cover plate (9).
10. The heat sink according to claim 8, wherein there are a plurality of spiral bionic micro-channel structures on the same micro-channel substrate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110420698.2A CN113175836A (en) | 2021-04-19 | 2021-04-19 | Spiral bionic micro-channel heat exchanger for cooling electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110420698.2A CN113175836A (en) | 2021-04-19 | 2021-04-19 | Spiral bionic micro-channel heat exchanger for cooling electronic device |
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| CN113175836A true CN113175836A (en) | 2021-07-27 |
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| CN202110420698.2A Pending CN113175836A (en) | 2021-04-19 | 2021-04-19 | Spiral bionic micro-channel heat exchanger for cooling electronic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114144034A (en) * | 2021-11-29 | 2022-03-04 | 哈尔滨工业大学 | Spider-web-imitated shunting type microchannel liquid cooling device |
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| US20050061486A1 (en) * | 2002-01-10 | 2005-03-24 | Hongwu Yang | Integrated heat pipe and its method of heat exchange |
| US20110174470A1 (en) * | 2010-01-20 | 2011-07-21 | Asia Vital Components Co., Ltd. | Spiral heat exchanger |
| CN104617062A (en) * | 2015-02-05 | 2015-05-13 | 哈尔滨工程大学 | Impacted water cooling chip radiator with imitated vegetation vein fractal micro-channel |
| CN204497212U (en) * | 2015-02-05 | 2015-07-22 | 哈尔滨工程大学 | With the impact type water-cooled chip radiator of the fractal micro-channel of bionic plant vein |
| CN106943938A (en) * | 2017-04-10 | 2017-07-14 | 安徽理工大学 | A kind of imitative vein channel design passive type micro-mixer |
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2021
- 2021-04-19 CN CN202110420698.2A patent/CN113175836A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1462901A (en) * | 1973-06-26 | 1977-01-26 | Toyoda Chuo Kenkyusho Kk | Heat exchangers |
| US20050061486A1 (en) * | 2002-01-10 | 2005-03-24 | Hongwu Yang | Integrated heat pipe and its method of heat exchange |
| US20110174470A1 (en) * | 2010-01-20 | 2011-07-21 | Asia Vital Components Co., Ltd. | Spiral heat exchanger |
| CN104617062A (en) * | 2015-02-05 | 2015-05-13 | 哈尔滨工程大学 | Impacted water cooling chip radiator with imitated vegetation vein fractal micro-channel |
| CN204497212U (en) * | 2015-02-05 | 2015-07-22 | 哈尔滨工程大学 | With the impact type water-cooled chip radiator of the fractal micro-channel of bionic plant vein |
| CN106943938A (en) * | 2017-04-10 | 2017-07-14 | 安徽理工大学 | A kind of imitative vein channel design passive type micro-mixer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114144034A (en) * | 2021-11-29 | 2022-03-04 | 哈尔滨工业大学 | Spider-web-imitated shunting type microchannel liquid cooling device |
| CN114144034B (en) * | 2021-11-29 | 2024-03-22 | 哈尔滨工业大学 | Cobweb-like split-flow type micro-channel liquid cooling device |
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