Abstract This study examines cooling efficiency, uniformity, and bubble dynamics on a porous surface. We use infrared (IR) thermometry to visualize results of temperature fields and liquid/vapor interfacial dynamics. Porous and non-porous micro-structured surfaces are prepared using soft-lithography and a ceramic precursor, allylhydropolycarbosilane (AHPCS). The surface cavities promote nucleation, and the heat transfer coefficient on the porous surface is approximately 30% higher than that on the non-porous surface. Additionally, the porous surface exhibits a more uniform temperature field with lower spatial and temporal variations than the non-porous surface. Bubble dynamics is visualized via an IR camera through the bottom side of the test specimens using the IR transparent characteristics of the substrate and micro-structures. The porous surface reveals higher nucleation site density and contact line density and lower equivalent bubble diameter when compared with those of the non-porous surface, and this is consistent with more effective and uniform cooling on the porous surface.

中文翻译：

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在多孔微结构表面上进行有效且均匀的冷却，并具有液体/蒸汽界面的可视化效果

摘要 本研究考察了多孔表面上的冷却效率、均匀性和气泡动力学。我们使用红外 (IR) 测温法来可视化温度场和液体/蒸汽界面动力学的结果。使用软光刻和陶瓷前体烯丙基氢聚碳硅烷 (AHPCS) 制备多孔和无孔微结构表面。表面空腔促进成核，多孔表面的传热系数比无孔表面高约30%。此外，与无孔表面相比，多孔表面表现出更均匀的温度场，具有更低的空间和时间变化。利用基材和微结构的红外透明特性，通过红外相机通过测试样品的底部观察气泡动力学。