Mesoscopic dynamics of droplets and emulsions in a microchannel (INVITED)

Abstract eng:
By using fluid-kinetic simulations of confined and concentrated emulsion droplets in a rough microchannel, we explore the role of geometrical roughness in providing activation of plastic events close to the boundaries. Our results show the existence of a finite stress correlation scale, which can be mapped directly onto the cooperativity scale, recently introduced in the literature to capture non-local effects in the soft-glassy dynamics. Numerical simulations also allow to study the fluidity field, a continuous quantity which can be related to the rate of plastic events, thereby allowing us to establish a link between the mesoscopic plastic dynamics of the jammed material and the macroscopic flow behaviour.

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