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Simulating contact angle hysteresis using pseudo-line tensions

Published online by Cambridge University Press:  10 July 2019

Ping He Open the ORCID record for Ping He [Opens in a new window]  and
Chun-Wei Yao
Ping He*
Affiliation:
Department of Mechanical Engineering, Lamar University, Beaumont, TX 77710, USA
Chun-Wei Yao*
Affiliation:
Department of Mechanical Engineering, Lamar University, Beaumont, TX 77710, USA
*
Address all correspondence of modeling and simulations to Ping He at phe@lamar.edu
Address all correspondence of experiments to Chun-Wei Yao at cyao@lamar.edu
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Abstract

Pseudo-line tensions are used in a continuum approach to simulate contact angle hysteresis. A pair of pseudo-line tensions in the receding and advancing states, respectively, are utilized to represent contact line interactions with a substrate because of the nanoscale topological and/or chemical heterogeneity on the substrate. A water droplet sitting on a horizontal or inclined substrate, whose volume is 4–30 µL, has been studied experimentally and numerically. Our simulation model predicts consistent hysteresis at four different droplet sizes compared with experiments. Meanwhile, the critical roll-off angles captured in simulations match well with experiments.

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Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 3 , September 2019 , pp. 1060 - 1066
Copyright
Copyright © Materials Research Society 2019 

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