Dynamics of surfactant-laden evaporating droplets

Karapetsas, G and Sahu, K C 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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IITH Creators:
IITH CreatorsORCiD
Sahu, K Chttp://orcid.org/0000-0002-7357-1141
Item Type: Conference or Workshop Item (Paper)
Subjects: Chemical Engineering > Biochemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Team Library
Date Deposited: 29 Sep 2015 08:30
Last Modified: 11 Jul 2017 03:56
URI: http://raiith.iith.ac.in/id/eprint/1961
Publisher URL: https://meetings.aps.org/Meeting/DFD15/Session/A33...
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