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| Flow and heat transfer characteristics of slot-jet microchannel heat sinks |
Zhuoran WANG( ),Zhijian SUN*(),Zitao YU |
| Institute of Thermal Science and Power Systems, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract The microchannel rib structure was optimized to improve thermal performance, temperature uniformity, and flow field homogeneity. The realizable k-ε turbulence model was employed to compare and discuss the cooling performance of a fully enclosed channel and four non-enclosed channels with varying fin heights. Model accuracy was validated experimentally. Results showed that adopting non-enclosed configurations effectively improved flow field homogeneity, resulting in a uniform velocity distribution. An optimal fin height was identified during the transition from the enclosed channel to decreasing fin heights, maximizing both the temperature uniformity and thermal performance of the heat sink. Under identical conditions, among the five configurations studied, the microchannel heat sink with a fin height of 1.8 mm exhibited the best thermal and temperature uniformity performance. Compared to the enclosed channel design, the average temperature was reduced by 4.22% and the maximum temperature difference was reduced by 7.4%. Compared to the design with a fin height of 1.2 mm, the average temperature was reduced by 14.95% and the maximum temperature difference was reduced by 15.43%.
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Received: 07 May 2024
Published: 25 July 2025
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Corresponding Authors:
Zhijian SUN
E-mail: 22227033@zju.edu.cn;zjsun@zju.edu.cn
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狭缝喷射微通道散热器的流动传热特性
优化微通道肋片结构，提高散热器的散热性、均温性并改善流场均匀性. 利用可实现的k-ε湍流模型，比较并讨论封闭通道与4组非封闭不同肋高通道的冷却性能，通过实验验证模型准确性. 研究结果表明：采用非封闭结构能够有效改善流场均匀性，使流场速度分布均匀；当通道由封闭式向肋高逐渐降低的非封闭式转变时，存在肋高最优值，使散热器的均温性能和散热性能达到最优. 在相同条件下，5组模型中肋高为1.8 mm的微通道散热器的散热性能和均温性能最佳，与封闭式通道相比，平均温度降低了4.22%，最大温差降低了7.4%；与肋高为1.2 mm的非封闭式通道相比，平均温度降低了14.95%，最大温差降低了15.43%.
关键词：
微通道散热器,
狭缝射流,
均温性,
散热性能,
强化传热,
数值模拟
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