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Title: Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study

Authors:
 [1];  [2];  [2]
  1. School of Energy Science and Engineering, Central South University, Changsha 410083, China, Computational Earth Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
  2. School of Energy Science and Engineering, Central South University, Changsha 410083, China
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1321037
Resource Type:
Journal Article: Published Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 32; Journal Issue: 37; Related Information: CHORUS Timestamp: 2017-08-31 04:25:07; Journal ID: ISSN 0743-7463
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

Citation Formats

Li, Qing, Zhou, P., and Yan, H. J.. Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study. United States: N. p., 2016. Web. doi:10.1021/acs.langmuir.6b01490.
Li, Qing, Zhou, P., & Yan, H. J.. Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study. United States. doi:10.1021/acs.langmuir.6b01490.
Li, Qing, Zhou, P., and Yan, H. J.. 2016. "Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study". United States. doi:10.1021/acs.langmuir.6b01490.
@article{osti_1321037,
title = {Pinning–Depinning Mechanism of the Contact Line during Evaporation on Chemically Patterned Surfaces: A Lattice Boltzmann Study},
author = {Li, Qing and Zhou, P. and Yan, H. J.},
abstractNote = {},
doi = {10.1021/acs.langmuir.6b01490},
journal = {Langmuir},
number = 37,
volume = 32,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acs.langmuir.6b01490

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • In this study, the dynamical behavior of a droplet on topologically structured surface is investigated by using a three-dimensional color-gradient lattice Boltzmann model. A wetting boundary condition is proposed to model fluid-surface interactions, which is advantageous to improve the accuracy of the simulation and suppress spurious velocities at the contact line. The model is validated by the droplet partial wetting test and reproduction of the Cassie and Wenzel states. A series of simulations are conducted to investigate the behavior of a droplet when subjected to a shear flow. It is found that in Cassie state, the droplet undergoes a transitionmore » from stationary, to slipping and finally to detachment states as the capillary number increases, while in Wenzel state, the last state changes to the breakup state. The critical capillary number, above which the droplet slipping occurs, is small for the Cassie droplet, but is significantly enhanced for the Wenzel droplet due to the increased contact angle hysteresis. In Cassie state, the receding contact angle nearly equals the prediction by the Cassie relation, and the advancing contact angle is close to 180°, leading to a small contact angle hysteresis. In Wenzel state, however, the contact angle hysteresis is extremely large (around 100°). Finally, high droplet mobility can be easily achieved for Cassie droplets, whereas in Wenzel state, extremely low droplet mobility is identified.« less
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