| 摘要: |
| 目前传统的风冷散热技术已无法满足高热流密度电子器件的散热需求，液冷散热技术已成为目前的研究热点。射流式水冷散热器作为液冷散热技术的一种，主要通过喷嘴将流体工质喷射到固体表面来达到散热目的。本文研究了射流式水冷散热的主要参数（喷射面积比、喷嘴数量、有无微通道）对散热器性能的影响，模拟结果表明：该散热器的最佳喷射面积比为0.14，此时散热器底板平均温度为55.8 ℃，压力损失为5.35 kPa，努塞尔数和传热系数分别为28.1和3.45 kW/ (m2·K) ；最佳的喷嘴数量为4，此时散热器底板平均温度最低，为51.4 ℃，压力损失为5.52 kPa，努塞尔数和传热系数达到最高值，分别为35.2和4.33 kW/ (m2·K)，并有效的消除了局部热点；微通道的增加微通道的增加使散热器整体换热性能显著增强,平均温度降低 3 ~ 6 ℃ ,当喷嘴数量为 4 时,布置微通道可使努塞尔数由 35. 2 升至 43. 3,传热系数由 4. 33 kW/ (m2·K)增至 5. 32 kW/ (m2·K),但压力损失略微上升(约 升高 20~ 60 Pa)。 |
| 关键词: 射流式水冷散热器 喷射面积比 喷嘴数量 微通道 性能优化 |
| DOI： |
| 投稿时间：2021-04-08 修订日期：2021-07-06
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| 基金项目:本文受天津市自然科学基金（18JCZDJC97100, 18JCYBJC90500）资助。 |
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| Numerical Simulation of the Performance of Jet Impingement Liquid-cooling Heat Sink with Different Key Parameters |
| Li Xueqiang,Bian Yali,Zhang Zhongyao,Xu Bingqing,Jiang Tao,Wang Yabo,Zhu Kai |
| (Tianjin University of Commerce, Tianjin Key Laboratory of Refrigeration Technology) |
| Abstract: |
| At present, air cooling technology is unable to meet the needs of high-heat-flux electronic devices. Liquid cooling technology has received increasing attention. As a type of liquid cooling technology, jet impingement liquid cooling primarily use nozzles to jet the working fluid directly to the solid surface, thereby improving the heat dissipation performance. The ratio of the jet area, the number of nozzles, and the influence of micro-channels are systematically discussed in this study, which can provide guidance for the optimization of such heat sinks. Simulation results show that the optimal ratio of the jet area is 0.14, in which the average temperature, pressure loss, Nusselt number, and heat transfer coefficient of the heat sink are 55.8 °C, 5.35 kPa, 28.1, and 3.45 kW/ (m2·K), respectively. The optimal number of nozzles is 4, in which the average temperature, pressure loss, Nusselt number, and heat transfer coefficient of the heat sink are 51.4 °C, 5.52 kPa, 35.2, and 4.33 kW/ (m2·K), respectively. In addition, hot spots can be eliminated in this condition. Moreover, the arrangement of the micro-channel decreases from 57.4 °C to 47.1 °C, and the Nusselt number and heat transfer coefficient increase from 35.2 and 4.33 kW/ (m2·K) to 43.4 and 5.32 kW/(m2·K), respectively. The pressure loss increases slightly (approximately 50–70 Pa). With an increase in micro-channels, the overall heat transfer performance of the heat sink is significantly enhanced. |
| Key words: jet impingement liquid cooling ratio of jet area number of nozzles micro-channel performance optimization |
