Pinning, Retraction and Terracing of Evaporating Droplets Containing Nanoparticles

O. K. Matar, R. Craster, Khellil Sefiane

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We consider the dynamics of a slender, evaporating droplet containing nanoparticles. We use lubrication theory to derive a coupled system of equations that govern the film thickness and the concentration of nanoparticles. These equations account for capillarity, Marangoni stresses, evaporation, and disjoining pressure; the nanoparticle-induced structural component of the disjoining pressure is also considered. Contact line singularities are avoided through the adsorption of ultrathin films wherein evaporation is suppressed by the disjoining pressure; a similar approach has recently been used by Ajaev [J. Fluid Mech. 2005, 528, 279−296] who has built on the previous work of Moosman and Homsy [J. Colloid Interface Sci. 1980, 73, 212−223]. The results of our numerical simulations indicate that, depending on the value of system parameters, the droplet exhibits a variety of different behaviours, which include spreading, evaporation-driven retraction, contact line pinning, and “terrace” formation.
Original languageEnglish
Title of host publication61st Annual Meeting of the American Physical Society Division of Fluid Dynamics
Pages3601–3609
Publication statusPublished - 25 Nov 2008

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