Stability of thin liquid films containing surface active particles

Umashankar, Hariharan and Kalpathy, Sreeram and Dixit, Harish Nagaraj (2017) Stability of thin liquid films containing surface active particles. In: 70th Annual Meeting of the APS Division of Fluid Dynamics, November 19–21, 2017, Denver, Colorado.

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Abstract

The stability and dynamics of thin liquid films(\textless 100 nm) are of immense importance in industrial settings like coating and printing processes and extraction of oil from porous rocks. In this study a hydrodynamic model is introduced to capture the long term evolution of a Newtonian liquid film containing insoluble surfaceactive particles.We consider here the possibility of four distinct interaction regimes based on the surface rheological effects of the particles, such that either, both or neither of Marangoni and surface viscosity effects would be present at the leading order in the governing equations. The liquid film is bounded by a rigid impermeable solid below and covered by passive air phase above.A standard linear stability analysis and nonlinear simulations are performed on the set of highly coupled partial differential evolution equations. Linear stability analysis gives insights on whether a particular imposed perturbationwavenumber will grow or decay in time and also evaluating the fastest growing wavenumber. Parametric studies for all four regimes provides a strong confirmation that surface viscosity and Marangoni effects are indeed rupture delaying effects.

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