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A dropwise condensation model using a nano-scale, pin structured surface

机译:使用纳米级针结构表面的逐滴冷凝模型

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摘要

In this paper, a dropwise condensation model using innovative "nano-scale, pin structured surfaces" is presented. The surfaces are porous surfaces oriented with nano- or sub micro-scale pins randomly designed or structurally arranged on extended and/or porous surfaces. These surfaces can promote a dropwise condensation showing a higher heat transfer rate than that of "filmwise" condensation by increasing the number of nucleation sites on the condenser surface and providing tunable surface properties such as surface wetting conditions. The developed model is consisted of a heat flux estimation of a single condensate drop based on thermal resistance analysis and a population theory for small and large condensate drops. The results of heat flux of a single condensate drop indicate that a smaller condensate drop with higher contact angle has a higher condensation heat flux; however, when it combined with population theory, a hemispherical shape of condensate with Wenzel surface wetting mode and a higher pin density can increase dropwise condensation heat transfer rates. In addition, a thinner nano- or sub micro-scale pins surfaces is required to increase condensation heat fluxes, when it is applied.
机译:在本文中,提出了一种使用创新的“纳米级,针状结构表面”的逐滴冷凝模型。所述表面是多孔表面,其定向有纳米级或亚微米级的针,所述纳米级或亚微米级的针被随机设计或结构地布置在延伸和/或多孔表面上。这些表面可以通过增加冷凝器表面上的成核位点数量并提供可调节的表面特性(如表面润湿条件)来促进滴状冷凝,从而显示出比“膜状”冷凝更高的传热速率。所开发的模型由基于热阻分析的单个凝结水液滴的热通量估算以及大小凝结水液滴的总体理论组成。单个凝结水珠的热通量结果表明,较小的凝结水珠具有较高的接触角,具有较高的凝结热通量。但是,如果将其与人口理论相结合,则凝结水的半球形形状(具有Wenzel表面湿润模式)和较高的销钉密度可以提高凝结水的逐滴传热速率。另外,当应用时,需要更薄的纳米或亚微米级的引脚表面以增加冷凝热通量。

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