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Advisor(s)
Abstract(s)
We have simulated the motion of a single vertical, two-dimensional liquid bridge spanning the gap between two flat, horizontal solid substrates consisting of alternating hydrophilic and hydrophobic stripes, using a multicomponent pseudopotential lattice Boltzmann method. This extends our earlier work where the substrates were uniformly hydrophilic or hydrophobic. In steady-state conditions, we calculate the following, as functions of pattern wavelength: (i) the velocity fields of moving bridges, in particular their (time-averaged) terminal velocities; (ii) the deformation of moving bridges, as measured by the deviation of bridge contact angles from their equilibrium values; (iii) the minimum applied force that breaks a moving bridge. In addition, we found that a bridge moving between patterned substrates cannot be mapped onto a bridge moving between uniform substrates endowed with some effective contact angle, even in the limit of very small pattern wavelength compared to bridge width.
Description
Keywords
Liquid bridge Binary fluids Lattice Boltzmann method Wetting Fluid dynamics
Citation
Rodrigues MS, Coelho RCV, Teixeira PIC – Dynamics of liquid bridges between patterned surfaces. Physica D: Nonlinear Phenomena. ISSN 0167-2789. Vol. 469 (2024), https://doi.org/10.1016/j.physd.2024.134322