期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 62, 期 -, 页码 54-59出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2016.02.015
关键词
Roughness; Receding contact angle; Triple line; Pinning and depinning; Evaporation; Constant contact radius
资金
- MOST [103-2221-E-011-158]
The dynamic behavior of water drops evaporating from poly(methyl methacrylate) (PMMA) substrates with different roughness was examined. The relaxation of the wetting diameter, height, volume and the contact angle of a drop was monitored during the evaporation process. For the smoother substrates with R-q <= 19 nm, four stages were identified during evaporation: the initial spreading stage, the constant contact radius (CCR) stage, the constant contact angle (CCA) stage, and the final stage. In contrast, for substrates with large roughness (R-q >= 209 nm), the CCA stage was not observed, and the contact line was pinned at its original position during almost the entire lifetime of the drop. The energy barrier associated with the pinning and depinning of the contact line was estimated using the Shanahan model, and the energy associated with PMMA substrates of roughness R-q = 4.9 and 19 nm was found to be on the order of 10(-8) J/m. The influences of the liquid withdrawal rate and the internal flow field were also studied, and the weak to strong pinning transition was found to be roughness dominant. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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