CN-116847628-B - Jet flow micro-channel heat sink

CN116847628BCN 116847628 BCN116847628 BCN 116847628BCN-116847628-B

Abstract

The invention discloses a jet flow micro-channel heat sink which comprises a shell, wherein the shell is divided into a micro-channel layer on the lower layer and a jet flow generation layer on the upper layer by a laminate. A plurality of pairs of first ribs are arranged in each microchannel at intervals and used for strengthening the disturbance of the fluid near the wall surface and the jet holes. And a second rib pair is arranged between the adjacent first ribs and used for disturbing fluid between the adjacent jet holes, so that the fluid velocity near the second ribs is higher, and the temperature of the middle area of the adjacent jet holes is reduced. The jet flow generating layer is also internally provided with a plurality of jet flow dispersing ribs for disturbing the fluid flowing in from the jet inlet, so that the problem of uneven jet flow distribution is solved. In addition, the structure of the invention can also add cross flow, and through improving the distribution of the jet flow diameter, the fluid at the latter half part of the micro-channel still has larger speed after the cross flow is mixed with the jet flow, and more heat can be taken away, so that the temperature distribution of the micro-channel is more uniform.

Inventors

CHENG LIWEN
ZHANG XICHEN
Xue Lirui
LUO YUZHONG
YANG DA

Assignees

扬州大学

Dates

Publication Date: 20260505
Application Date: 20230705

Claims (5)

1. The jet flow microchannel heat sink is characterized by comprising a shell (1), wherein the shell (1) is divided into a lower microchannel layer (2) and an upper jet flow generation layer (3) by a laminate, a jet flow inlet (101) is arranged in the center of the top of the shell (1), a microchannel outlet (103) is arranged on the side wall of the microchannel layer (2) of the shell (1), and a plurality of jet flow dispersing ribs (302) for disturbing fluid flowing in from the jet flow inlet (101) are arranged in the jet flow generation layer (3); the micro-channel layer (2) is divided into a plurality of parallel micro-channels by a partition plate (201) at the bottom of the vertical shell (1), a plurality of pairs of first ribs (202) are uniformly arranged in each micro-channel at intervals along the length direction of the micro-channel, each pair of first ribs (202) consists of two ribs which are oppositely arranged at intervals, and one vertical side edge of each two ribs is respectively connected with the partition plate (201) or the shell (1); A plurality of jet holes (301) are distributed on the laminate, and each jet hole (301) is respectively right opposite to the center point between each pair of first ribs (202) in the microchannel layer (2) below; The jet flow dispersing ribs (302) are positioned right below the jet flow inlet (101) and comprise four third ribs parallel to the length direction of the micro channel and four perpendicular fourth ribs, the fourth ribs are arranged in pairs and in parallel, the third ribs are positioned between two groups of the fourth ribs which are arranged in pairs and in parallel, the distance between every two adjacent third ribs is equal to the width of the third rib, and the distance between every two adjacent fourth ribs is smaller than the length of the fourth rib.
2. The jet flow micro-channel heat sink according to claim 1, wherein a lateral flow inlet (102) is further arranged on one side wall of the shell (1) opposite to the end part of each micro-channel, and the diameter of one jet flow hole (301) corresponding to the top of each micro-channel is gradually reduced from the lateral flow inlet (102) to the micro-channel outlet (103).
3. The jet microchannel heat sink according to claim 1 or 2, characterized in that the width of the second ribs (203) is smaller than the width of the first ribs (202), and the spacing of two ribs of each pair of the second ribs (203) is smaller than the width of the second ribs (203).
4. The jet microchannel heat sink according to claim 1, characterized in that the height of the jet dispersion rib (302) is 1/2 of the height of the cavity of the jet generating layer (3).
5. A jet micro-channel heat sink according to claim 3, characterized in that the height of the first rib (202) and the second rib (203) is 1/2 of the height of the micro-channel.

Description

Jet flow micro-channel heat sink Technical Field The invention relates to a radiator structure, in particular to a micro-channel heat sink structure. Background With the continuous development of electronic devices, the integration level of the electronic devices is higher and higher, and the power density of the electronic devices is continuously improved, so that the heating problem of the electronic devices is increasingly outstanding. If the electronic device is in a high temperature state for a long time in the working process, the performance of the device is reduced, the service life is shortened, and even the device is damaged. Therefore, there is a need to develop efficient heat sinks to address the high heat flux problems caused by electronics. The development of micro-channel technology starts in the 80 s of the 20 th century, is mainly applied to the fields of chemical industry, biomedicine and the like at first, and is gradually applied to the field of heat dissipation of electronic devices later. The main principle of the micro-channel heat sink is that a heating element is contacted with a micro-channel, and heat is taken away by fluid in the micro-channel, so that the heat dissipation effect is realized. The jet flow micro-channel heat sink is a novel heat dissipation technology combining micro-channel technology and jet flow technology, and the main principle is that high-speed fluid passes through the micro-channel to form jet flow so as to quickly transfer heat into a cooling medium. Through the jet flow, the heat transfer effect between the cooling medium and the micro-channel can be enhanced, so that the heat dissipation efficiency is improved. The jet micro-channel heat sink has the advantages of high efficiency, portability, reliability and the like, has wide application range, and can well solve the heat dissipation problem of electronic devices. With the continuous development and application of microfluidic technology, jet micro-channel heat sinks will be increasingly used in electronic product design. At present, the following problems generally exist in the existing jet micro-channel heat sink: 1. the jet is unevenly distributed. The diameter of the jet inlet is far smaller than the distribution range of jet holes, the jet speed of the jet holes in the jet inlet range is larger, the jet speed of the jet holes outside the range is smaller, and jet holes at the edge of the range almost cannot form jet. 2. After the jet flows through the jet holes and enters the micro-channel layer, the fluid velocity of the area near the jet holes is higher, and the fluid velocity of the middle area of the adjacent jet holes is lower, so that the heat dissipation of the middle area is poorer. Disclosure of Invention Aiming at the prior art, the invention provides a jet flow micro-channel heat sink with a turbulence rib, which solves the problems of uneven jet flow distribution and poor heat dissipation of a middle area corresponding to adjacent jet flow holes in a micro-channel in the prior structure. The technical scheme is that the jet flow microchannel heat sink comprises a shell, wherein the shell is divided into a lower microchannel layer and an upper jet flow generation layer by a laminate, a jet flow inlet is arranged in the center of the top of the shell, and a microchannel outlet is arranged on the side wall of the shell, which is positioned on the microchannel layer, a plurality of jet flow dispersing ribs for disturbing fluid flowing in from the jet flow inlet are arranged in the jet flow generation layer; The micro-channel layer is divided into a plurality of parallel micro-channels by a baffle plate at the bottom of the vertical shell, a plurality of pairs of first ribs are uniformly arranged in each micro-channel at intervals along the length direction of the micro-channel, each pair of first ribs consists of two ribs which are oppositely arranged at intervals, and one vertical side edge of each two ribs is respectively connected with the baffle plate or the shell; and each pair of second ribs are respectively arranged in each micro channel and are arranged right below the middle of the adjacent jet holes, and each pair of second ribs consists of two ribs which are oppositely arranged at intervals. Further, a lateral wall of the shell, which is opposite to the end part of each micro-channel, is also provided with a cross flow inlet, and the diameter of a corresponding jet hole at the top of each micro-channel is gradually reduced from the cross flow inlet to the outlet direction of the micro-channel. Further, the jet flow dispersing ribs are positioned right below the jet flow inlet and comprise four third ribs parallel to the length direction of the micro channel and four perpendicular fourth ribs, the fourth ribs are arranged in parallel in pairs, the third ribs are positioned between two groups of the fourth ribs which are arranged in parallel in pairs, the distance between every t