@Article{CiCP-9-1094,
author = {Junfeng Zhang and Daniel Y. Kwok},
title = {Roughness Effects on Continuous and Discrete Flows in Superhydrophobic Microchannels},
journal = {Communications in Computational Physics},
year = {2011},
volume = {9},
number = {5},
pages = {1094--1105},
abstract = {<p style="text-align: justify;">The dynamic behaviors of continuous and discrete flows in superhydrophobic
microchannels are investigated with a lattice Boltzmann model. Typical characters
of the superhydrophobic phenomenon are well observed from our simulations, including
air trapped in the surface microstructures, high contact angles, low contact
angle hysteresis, and reduced friction to fluid motions. Increasing the roughness of
a hydrophobic surface can produce a large flow rate through the channel due to the
trapped air, implying less friction or large apparent slip. The apparent slip length appears
to be independent to the channel width and could be considered as a surface
property. For a moving droplet, its behavior is affected by the surface roughness from
two aspects: the contact angle difference between its two ends and the surface-liquid
interfacial friction. As a consequence, the resulting droplet velocity changes with the
surface roughness as firstly decreasing and then increasing. Simulation results are also
compared with experimental observations and better agreement has been obtained
than that from other numerical method. The information from this study could be
valuable for microfluidic systems.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.151009.270910s},
url = {http://global-sci.org/intro/article_detail/cicp/7538.html}
}