title: Contact line and contact angle dynamics in superhydrophobic channels.
abstract: The dynamics of the wetting and movement of a three-phase contact line confined between two superhydrophobic surfaces were studied using a mean-field free-energy lattice Boltzmann model. Principle features of superhydrophobic surfaces, such as trapped vapor/air between rough microstructures, high contact angles, reduced contact angle hysteresis, and low resistance to fluid flow, were all observed. Movement of the three-phase contact line over a well-patterned superhydrophobic surface displays a periodic stick-jump-slip behavior, while the dynamic contact angle changes accordingly from maximum to minimum. Two regimes were found for the flow velocity as a function of surface roughness and can be related directly to the balance between driving force and flow resistance. This work provides a better understanding of dynamic wetting and fluid flow behaviors over superhydrophobic surfaces and hence could be useful in related applications.
authors.affiliation: Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, USA.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Zhang
authors.forename: Daniel Y
authors.initials: DY
authors.lastname: Kwok
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D008956:Models, Chemical