Wetting failure and contact line dynamics in a Couette flow

Details Wetting failure and contact line dynamics in a Couette flow Wetting failure and contact line dynamics in a Couette flow

2008-12-17

arxiv.org/abs/0812.3303v1

Journal of Fluid Mechanics 614, 471-493 (2008)

Physics

Fluid Dynamics

25 Pages, 14 Figures

Scientific paper

10.1017/S0022112008003649

Liquid-liquid wetting failure is investigated in a two-dimensional Couette system with two immiscible fluids of arbitrary viscosity. The problem is solved exactly using a sharp interface treatment of hydrodynamics (lubrication theory) as a function of the capillary number, viscous ratio and separation of scale, i.e. slip length versus macroscopic scale of the system. The existence of critical velocities, above which no stationary solutions are found, is analyzed in detail in terms of the relevant parameters of the system. Comparisons with existing analysis for other geometries are also carried out. A numerical method of analysis is also presented, based on diffuse interface models obtained from multiphase extensions of the lattice Boltzmann equation (LBE). Sharp interface and diffuse interface models are quantitatively compared face to face indicating the correct limit of applicability of the diffuse interface models.

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