周期性分流微通道的结构设计及散热性能

王晗; 袁礼; 王超; 王如志

doi:10.7498/aps.70.20201802

周期性分流微通道的结构设计及散热性能

doi: 10.7498/aps.70.20201802

王晗¹,
袁礼²,
王超¹,
王如志^1, ,

详细信息

通讯作者:
E-mail: wrz@bjut.edu.cn

中图分类号: 44.05.+e, 44.10.+i, 44.15.+a, 44.20.+b
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- 被引次数: 0
出版历程
- 收稿日期: 2020-10-30
- 修回日期: 2020-11-24
- 网络出版日期: 2021-05-27
- 发布日期: 2021-05-27

Structure and thermal properties of periodic split-flow microchannels

More Information

Corresponding author: Wang Ru-Zhi, E-mail: wrz@bjut.edu.cn

摘要

摘要: 微通道散热器在集成电路中具有重要应用, 但目前传统的长直微通道散热过程导致温度不均匀, 散热效率较低. 本文设计了一种周期性分流微结构并与传统微通道进行集成, 实现了一种高效率的周期性分流微通道散热器. 基于以上周期性分流微通道, 系统研究了单根微通道内微结构数目、微结构的排布方式及结构参数对其散热性能的影响. 结果表明, 引入的分流微结构可增大换热面积、打破原有层流边界层、促进冷/热冷却液混合、显著改善微通道散热性能. 在100 W/cm²的热流密度下, 入口端冷却液流速为1.18 m/s时, 单根微通道内引入9组微结构后, 其最高温度下降约24 K, 热阻下降约44%, 努塞尔数增大约124%, 整体传热性能(PEC)达1.465. 进一步地, 微结构采用交错渐变的周期排布方式, 沿流动方向逐渐变宽的扰流元使得冷却液被充分利用, 减少了高/低温区的存在且缓解了散热面沿流动方向存在的温度梯度, 压降损失相较于均匀排布也有一定程度的降低, 有效提升了散热效率. 本文提出的周期性分流微通道将在大功率集成电路及电子冷却领域中具有广阔的应用前景.
- 微通道 /
- 散热结构 /
- 周期性分流
Abstract: Microchannel heat sinks have important applications in integrated circuits, but the current traditional long straight microchannel heat dissipation process causes uneven temperature and low heat dissipation efficiency. In this paper, a periodic split-flow microstructure is designed and integrated with traditional microchannels to form a periodic split-flow microchannel heat sink. Numerical simulation is used to study the influence of the number, the arrangement and structural parameters of microstructures in a single microchannel on its thermal performance. The simulation results show that the split-flow microstructure can increase the heat exchange area, break the original laminar boundary layer, promote the mixing of cold/hot coolant, and significantly improve the heat dissipation performance of the microchannel. Through comparative experiments, 9 groups are finally determined as the optimal number of microstructures in a single microchannel. At a heat flux of 100 W/cm², when the coolant flow rate at the inlet is 1.18 m/s, after 9 groups of microstructures are added into a single microchannel, the maximum temperature drops by about 24 K and the thermal resistance decreases by about 44%. The Nusselt number is increased by about 124%, and the performance evaluation criterion (PEC) reaches 1.465. On this basis, the microstructure adopts a staggered gradual periodic arrangement to avoid the long-distance non-microstructure section between the two groups of microstructures. The turbulence element that gradually widens along the flow direction makes the coolant fully utilized. This results in a reduction in the high/low temperature zone and alleviates the temperature gradient that exists along the flow direction of the heat dissipation surface, and the pressure drop loss is also reduced to a certain extent compared with the pressure drop in the uniform arrangement, and the comprehensive thermal performance is further improved. It shows broad application prospects in the field of high-power integrated circuits and electronic cooling.
- microchannel /
- heat dissipation structure /
- periodic split-flow

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图 1 长直微通道散热器结构示意图　(a)长直微通道散热器; (b)单根微通道截面

Figure 1. Schematic diagram of the long straight microchannel heat sink: (a) Long straight microchannel heat sink; (b) cross section of a single microchannel

下载: 全尺寸图片幻灯片

图 2 分流微通道结构示意图　(a)分流微通道散热器; (b)分流微结构局部俯视图

Figure 2. Schematic diagram of the split-flow microchannel structure: (a) Split-flow microchannel heat sink; (b) Partial top view of the split-flow microstructure

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图 3 含有不同数量及排布方式微结构的单/双根微通道示意图: SM1 (0组); SM2 (3组); SM3 (9组); SM4 (15组); DM1 (交错排布); DM2 (渐密排布); DM3 (渐变排布); DM4(交错渐变排布)

Figure 3. Schematic diagram of single/double microchannels with different numbers and arrangements of microstructures: SM1 (0 group); SM2 (3 groups); SM3 (9 groups); SM4 (15 groups); DM1 (staggered arrangement); DM2 (gradually arranged); DM3 (gradient arrangement); DM4 (staggered gradient arrangement)

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图 4 (a) SM1—SM4微通道内主流线方向流体的压力变化; (b) SM3及DM1—DM4在不同入口端流速下的压降损失

Figure 4. (a)Pressure change of the fluid in the direction of the main flow line in the SM1–SM4 microchannel; (b) the pressure drop loss of SM3 and DM1–DM4 at different inlet flow rates.

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图 5 SM2中微结构附近局部流体的压力变化切面云图

Figure 5. Cross-sectional cloud diagram of pressure change of local fluid near the microstructure in SM2

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图 6 整体热阻与泵送功率的关系　(a) SM1—SM4; (b) SM3, DM1—DM4

Figure 6. Relationship between overall thermal resistance and pumping power: (a) SM1–SM4; (b) SM3, DM1–DM4

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图 7 流体在SM2微通道内不同位置的流速分布

Figure 7. Flow velocity distribution of fluid at different positions in the SM2 microchannel

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图 8 不同位置流速切面图

Figure 8. Cross-sectional view of flow velocity at different locations

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图 9 微通道底面最高温度与入口端流速的关系　(a) SM1—SM4; (b) SM3及DM1—DM4

Figure 9. Relationship between the maximum temperature on the bottom of the microchannel and the flow rate at the inlet: (a) SM1–SM4; (b) SM3 and DM1–DM4

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图 10 不同情况下底面上沿主流动方向上温度变化　(a) SM1—SM4; (b) SM3及DM1—DM4

Figure 10. Temperature changes along the main flow direction on the bottom surface under different conditions: (a) SM1–SM4; (b) SM3 and DM1–DM4.

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图 11 不同情况下换热面温度分布云图

Figure 11. Cloud diagram of temperature distribution of heat exchange surface under different conditions.

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图 12 微通道散热器整体热阻与入口雷诺数的关系

Figure 12. The relationship between the overall thermal resistance of the microchannel radiator and the entrance Reynolds number.

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图 13 (a)不同情况下努塞尔数与入口端雷诺数的关系; (b)不同情况PEC与入口雷诺数的关系

Figure 13. (a) The relationship between Nusselt number and inlet Reynolds number under different conditions; (b) the relationship between performance evaluation criterion and inlet Reynolds number under different conditions.

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表 1 不同温度下水的物理参数

Table 1. Physical parameters of water at different temperatures

温度 T/K	密度 ρ/ (kg·m^–3)	恒压热容 c_p/ (J·kg^–1·K^–1)	导热系数 κ/ (W·m^–1·K^–1)	动态黏度 μ/ (10^–4Pa·s)
293.15	998.2	4186.9	0.59423	10.093
303.15	995.62	4179.7	0.61055	7.96
313.15	992.2	4176.5	0.62516	6.51
323.15	988.05	4176.8	0.6381	5.47
333.15	983.22	4180.2	0.64942	4.70
343.15	977.78	4186.3	0.65916	4.10
353.15	971.78	4194.8	0.66738	3.59
363.15	965.3	4205.4	0.67413	3.17
373.15	958.39	4218.2	0.67944	2.82
383.15	958.39	4233	0.68337	2.53

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表 2 硅的物理参数

Table 2. Physical parameters of silicon.

材料物性	密度ρ/ (kg·m^–3)	恒压热容 c_p/ (J·kg^–1·K^–1)	导热系数k/ (W·m^–1·K^–1)
硅	2329	700	130

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表 3 网格独立性研究

Table 3. Grid independence research

	网格1893083	网格21128905	网格31414841	网格41702482	网格51916125	网格63475672
压降损失( $ \Delta P $)	4195.0	4287.0	4341.2	4379.9	4409.6	4406.1
最高温度(T_m)	353.05	352.65	352.32	351.94	351.88	351.87
误差	4.8%; 0.33%	2.7%; 0.22%	1.47%; 0.13%	0.59%; 0.020%	0.079%; 0.0028%	基准

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