The rise of Newtonian drops in a nematic liquid crystal

摘要: We simulate the rise of Newtonian drops in a nematic liquid crystal parallel to far-field molecular orientation. The moving interface is computed diffuse-interface framework, and anisotropic rheology represented by Leslie–Ericksen theory, regularized permit topological defects. Results reveal interesting coupling between flow field orientational surrounding drop, especially defect configuration. generally sweeps point ring defects downstream, may transform into defect. stability these their transformation are depicted phase diagram terms Ericksen number ratio surface anchoring bulk elastic energies. orientation affects return. Drops with planar on faster than those homeotropic anchoring, former features vortex wake. These attributed viscous anisotropy nematic. With drop rising velocity experiences an overshoot, owing initial satellite both types drag coefficient decreases increasing as flow-alignment reduces effective viscosity crystal.