ABSTRACT

In this study, the effects of surface roughness (R_a) on single-phase and two-phase cooling performances of HFE-7100 and water under different coolants, pressures, and subcoolings were studied. The eight surfaces were unidirectionally roughened. A general trend was that the heat transfer increased with increasing R_a. Owing to the larger contact angle and fewer nucleate sites, the smoother surface had poorer heat transfer performance. Visualization was performed to reveal secondary nucleation on the smooth surface. Finally, correlations were developed to predict the heat transfer performance for different values of R_a.

中文翻译：

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单向表面粗糙度对喷雾冷却传热性能的影响

摘要

在本研究中，研究了在不同冷却剂、压力和过冷度下，表面粗糙度 ( R _a ) 对 HFE-7100 和水的单相和两相冷却性能的影响。八个表面被单向粗糙化。总的趋势是传热随着R _{a 的}增加而增加。由于较大的接触角和较少的形核位置，较光滑的表面具有较差的传热性能。进行可视化以揭示光滑表面上的二次成核。最后，开发了相关性来预测不同R _a值的传热性能。