The apparent state of droplets on a rough surface |
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Authors: | XiaoLing Chen and Tian Lu |
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Institution: | (1) Key Laboratory for Power Machinery and Engineering of Ministry of Education, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China |
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Abstract: | The factors influencing the state and wetting transition of droplets on a rough surface are both complex and obscure. The
change in wetting is directly reflected by changes under the contact condition of the droplets with the surface. The recent
study about the wettability of the superhydrophobic surface under the condensing condition arouses the new understanding about
the apparent state of droplets on a rough surface. In this work, to validate the existence of droplets in an intermediate
state, a microscale pillar topological polydimethylsiloxane (PDMS) surface was manufactured and its wettability under various
conditions was studied. According to the experimental data, it is proposed that the wetting state of a rough surface may be
embodied using the contact area ratio of a solid/liquid/gas droplet with the projective plane. A general calculation model
for the apparent contact angle of droplets is given and expressed diagrammatically. It is found that the measured apparent
contact angles of droplets at different states on the surface falls within the range predicted by our proposed equation.
Supported by the National Natural Science Foundation of China (Grant No. 50606025) |
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Keywords: | rough surface wettability apparent contact angle condensing condition |
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