| 摘要: |
| 本文构建了一种新型矩阵式微射流圆柱肋热沉，热沉设计成三明治结构，具有紧凑、体积小等特点。上部是上气室，中间是射流孔板，射流孔板上设置有回流通道，降低了横向流对射流冲击换热的影响，底部是下气室，下气室里面有圆柱肋板，阵列圆柱肋可增加传热面积同时增强流体扰动而加强换热。采用实验与数值模拟结合的方法，分别对射流雷诺数、热流密度、冲击高径比对热沉内换热特性影响进行研究。结果表明：当射流雷诺数为1 596~2 874、射流冲击高度为4、6、8 mm时，与无肋被冷却表面相比，有圆柱肋的被冷却表面的温度更低，平均对流换热表面传热系数提高1%~3%。随射流雷诺数增加热沉换热性能也逐渐增强，在射流雷诺数为2 874时，实验测得圆柱肋板被冷却表面的平均对流换热表面传热系数最大可达1 360 W/（m2?K）。 |
| 关键词: 强化换热 阵列射流 回流结构 圆柱肋热沉 数值模拟 |
| DOI： |
| Received:May 15, 2022Revised:June 16, 2022 |
| 基金项目:江西省自然科学基金资助项目（20202BAB204022）资助；江西省科技厅重点研发计划资助项目（20192BBEL50032） |
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| Study on Heat Transfer Characteristics of Multiple Micro-jet Impinging Heat Sink of a Cylindrical Fin |
|
Sun Jian, Du Haiquan, Li Zhiwei, Wang Luojian, Zhong Ming
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| (School of Materials Science and Engineering, Jingdezhen Ceramic University) |
| Abstract: |
| A novel multiple micro-jet impinging cylindrical fin heat sink was constructed. The heat sink was designed as a sandwich structure with a compact structure, where the upper part was an air chamber and the middle part was a jet orifice plate. In addition, a return channel was arranged on the jet orifice plate, which reduced the influence of the transverse flow on the jet impingement heat transfer. At the bottom was a gas chamber, which was equipped with a cylindrical fin plate. Cylindrical fins can increase the heat transfer area and enhance the fluid disturbance to enforce heat transfer. The effects of Reynolds number, heat flux, and height-diameter ratio on the heat transfer characteristics of the heat sink were studied using experimental and numerical methods. The results show that a cooled surface with a cylindrical fin has a lower temperature, and the average convective heat transfer coefficient of the cooled surface increases by 1%–3% compared with that of a surface without a fin at jet Re of 1596–2 874; the jet impact heights H were 4 mm, 6 mm, and 8 mm. As the Re increases, the heat transfer performance gradually improves. When the Re of the jet was 2 874, the maximum average convective heat transfer coefficient of the cooled surface of the cylindrical fin plate reached 1 360 W/(m2?K). |
| Key words: enhanced heat transfer jet impingement array return structure heat sink with cylindrical fin numerical simulation |
