標題: Scale Effect on Dropwise Condensation on Superhydrophobic Surfaces
作者: Lo, Ching-Wen
Wang, Chi-Chuan
Lu, Ming-Chang
機械工程學系
Department of Mechanical Engineering
關鍵字: two-tier roughness;condensation;superhydrophobicity;Cassie droplets;Bond number;solid-liquid fraction
公開日期: 27-八月-2014
摘要: Micro/nano (two-tier) structures are often employed to achieve superhydrophobicity. In condensation, utilizing such a surface is not necessarily advantageous because the macroscopically observed Cassie droplets are usually in fact partial Wenzel in condensation. The increase in contact angle through introducing microstructures on such two-tier roughened surfaces may result in an increase in droplet departure diameter and consequently deteriorate the performance. In the meantime, nanostructure roughened surfaces could potentially yield efficient shedding of liquid droplets, whereas microstructures roughened surfaces often lead to highly pinned Wenzel droplets. To attain efficient shedding of liquid droplets in condensation on a superhydrophobic surface, a Bond number (a dimensionless number for appraising drop-wise condensation) and a solid-liquid fraction smaller than 0.1 and 0.3, respectively, are suggested.
URI: http://dx.doi.org/10.1021/am503629f
http://hdl.handle.net/11536/25049
ISSN: 1944-8244
DOI: 10.1021/am503629f
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 6
Issue: 16
起始頁: 14353
結束頁: 14359
顯示於類別:期刊論文


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