Steady-state deformation behavior of confined composite droplets under shear flow

Abstract

The shear-induced dynamics of two-dimensional composite droplets in a narrow channel is investigated numerically. The droplets consist of a viscous inner droplet (core) and shell immersed in a continuous Newtonian fluid. Attention is focused on studying the effects of confinement at different core-to-shell radii ratios, relative viscosities of the medium components, and interfacial tensions on the steady-state deformation and orientation of a composite droplet. The role of the "sustaining" effect due to the internal core and competition between the near-wall shear flow and downward and upward secondary streams is discussed.

Dilute dispersion of compound particles: deformation dynamics and rheology

“…Several numerical (Kawano & Hashimoto 1997; Smith, Ottino & Cruz 2004; Chen, Liu & Shi 2013; Hua, Shin & Kim 2014; Chen et al. 2015 a ; Chen, Liu & Zhao 2015 b ; Patlazhan, Vagner & Kravchenko 2015; Kim & Dabiri 2017) and theoretical (Mori 1978; Johnson 1981; Harper 1982; Johnson & Sadhal 1985; Sadhal, Ayyaswamy & Chung 1997; Sagis & Öttinger 2013) studies have addressed the hydrodynamics and the deformation dynamics of composite systems in an imposed flow. Johnson (1981) investigated the creeping flow past a rigid sphere coated with a thin film.…”