Karapetsas, G and Sahu, Kirti Chandra and Matar, O K
(2015)
Dynamics of surfactant-laden evaporating droplets.
In: 68th Annual Meeting of the APS Division of Fluid Dynamics, 22–24 November, 2015, Boston, Massachusetts.
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Abstract
We consider the flow dynamics of a thin evaporating droplet in
the presence of an insoluble surfactant and small particles in the bulk. Evolution
equations for the film height, the interfacial surfactant and bulk particle concentra-
tion are derived using a lubrication model coupled by a constitutive relation for the
dependence of the viscosity on local particle concentration. An important ingredient
of our model is that it takes into account the fact that the surfactant adsorbed at
the surface hinders the evaporation. Time-dependent simulations are performed to
determine how the presence of surfactants affects the evaporation and flow dynamics
with and without the presence of particles in the bulk. We discuss the various mech-
anisms that affect the shape of the droplet as it evaporates as well as the resulting
pattern of particle deposition.
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