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Orientador(es)
Resumo(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.
Descrição
Palavras-chave
Liquid bridge Binary fluids Lattice Boltzmann method Wetting Fluid dynamics
Contexto Educativo
Citação
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