Droplet condensation on chemically homogeneous and heterogeneous surfaces
Droplet condensation on chemically homogeneous and heterogeneous surfaces
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DOI：
10.1063/1.4962645
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发表时间：
2016-09
影响因子：
3.2
通讯作者：
Amir M. Ashrafi;A. Moosavi
中科院分区：
文献类型：
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作者：
Amir M. Ashrafi;A. Moosavi
采用二维双分布函数热格子Boltzmann方法研究了水平表面上冷凝液滴的成核与生长。首先，研究了完全均匀表面上的冷凝现象，分析了滴状冷凝和膜状冷凝的不同机理。结果表明，在完全光滑的表面上的冷凝冷却蒸汽层的不稳定性的存在。在第二步中，化学非均匀表面上的冷凝进行了研究。此外，还研究了表面温度不均匀性的影响。结果表明，汽层不稳定性和形核是从非均匀性开始的。不同数量的异质性，它们的距离，和疏水性上的缩合的影响也检查。结果表明，通过增加异质性的疏水性和考虑异质性之间的最佳间距，可以实现最大的冷凝性能。最终...
Nucleation and growth of condensing droplets on horizontal surfaces are investigated via a 2-D double distribution function thermal lattice Boltzmann method. First, condensation on completely uniform surface is investigated and different mechanisms which cause dropwise and filmwise condensation are studied. The results reveal the presence of cooled vapor layer instability in the condensation on completely smooth surfaces. In the second step, condensation on chemically heterogeneous surfaces is investigated. Moreover, the effect of non-uniformity in the surface temperature is also studied. The results indicate that the vapor layer instability and the nucleation start from the heterogeneities. The effects of different numbers of heterogeneities, their distance, and hydrophobicity on the condensation are also inspected. It is shown that by increasing the hydrophobicity of the heterogeneities and considering an optimum space between the heterogeneities, maximum condensation performance can be achieved. Finall...