Heat transfer performance and optimization of a close-loop R410A flash evaporation spray cooling
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Heat transfer performance and optimization of a close-loop R410A flash evaporation spray cooling
- 发表刊物：
- Applied Thermal Engineering
- 摘要：
- 本文首次报道了不同喷雾冷却距离下制冷剂R410A闭式循环闪蒸喷雾冷却光滑平板的冷却传热性能，主要实验工作由2018届本科生林彦可等同学完成。林彦可同学目前就香港科大师从赵天寿教授攻读博士学位。
Abstract
Flash spray cooling has been subject to increased attention because of its high heat dissipation capacity at low surface temperature in the application of high power technologies. In this study, experiment was conducted to study the effects of spray distance and nozzle diameter on heat transfer performance in a closed-loop R410A flash spray cooling system for the first time. Five spray distance from 10 mm to 30 mm and three nozzles with same internal structure but different diameters of 0.51, 0.56 and 0.69 mm were employed. The experiment results indicated the critical heat flux (CHF) value firstly increased and then deceased with the increase of spray distance, which is consistent with previous research of spray cooling with FC-72 and FC-87. The highest CHF value reached 264 W/cm2 while maintaining surface temperature below 30 oC and heat transfer coefficient (HTC) was about 210 kW/(m2∙K) at 25 mm, which were 60% higher than those at 10 mm spray distance. The nozzle with medium orifice diameter of 0.56 mm showed a superior cooling performance, instead of larger nozzle with higher refrigerant flow rate. Therefore, there existed a counterbalance between the mass flow and outlet velocity in determining the optimum nozzle orifice diameter.
- 合写作者：
- Yan-Ke Lin，Zhi-Fu Zhou*，Yu Fang，Hong-Lin Tang，Bin Chen
- 是否译文：
- 否
- 发表时间：
- 2019-06-16