A mesoscopic model for the rheology of soft amorphous solids, with application to microchannel flows.

摘要: We have studied a mesoscopic model for the flow of amorphous solids. The is based on key features identified at microscopic level, namely periods elastic deformation interspersed with localised rearrangements particles that induce long-range deformations. These deformations are derived following continuum mechanics approach, in presence solid boundaries, and included full model. Indeed, they mediate spatial cooperativity flow, whereby rearrangement may lead distant region to yield. In particular, we simulated channel found manifestations consistent published experimental observations concentrated emulsions microchannels. Two categories effects distinguished. On one hand, coupling regions subject different shear rates, instance, leads finite rate fluctuations seemingly unsheared “plug” centre channel. other there convincing evidence specific rheology near rough walls. discuss diverse possible physical origins this effect, suggest it be associated bumps into surface asperities as slide along wall.