期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 144, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.118708
关键词
Mixture droplet; PDMS; Evaporation; Wettability; Constant contact radius mode
资金
- National Natural Science Foundation of China [11572114, 11702299]
- Chinese Academy of Sciences Strategic Priority Research Program [XDB22040401]
- Opening Fund of Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences
We report evaporation of ethanol/water mixture droplets on both pillar-arrayed and micro-holed poly-dimethylsiloxane (PDMS) surfaces. Analysis of wettability shows that (i) when the pillar-to-pillar spacing is 5 mu m, the pillar-arrayed PDMS surfaces are Cassie-Baxter-wetted; (ii) when the pillar-to-pillar spacing is 20 or 50 mu m, part of each pillar-arrayed surface is Cassie-Baxter-wetted while the other part Wenzel-wetted; (iii) all micro-holed PDMS surfaces are Cassie-Baxter-wetted; (iv) the advancing and receding contact angles increase with the increase of the pillar-to-pillar spacing, while they decrease with the increase of the hole-to-hole spacing. The investigation on evaporation of mixture droplets demonstrates that (i) evaporation on pillar-arrayed PDMS first proceeds with constant contact radius mode (CCR) due to the strong adhesion between the surface and the droplet; (ii) on micro-holed surfaces CCR stage is also observed for the surface with the hole-to-hole spacing of 5 mu m, while it is not found at high ethanol concentration for surfaces with the hole-to-hole spacings of 20 mu m and 50 mu m, which is attributed to the weak adhesion between the micro-holed surfaces and the droplet. Finally, the evolution of droplet volume and its two-third power are discussed. (C) 2019 Elsevier Ltd. All rights reserved.
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