Marangoni Convection in Rotating Liquid Systems

摘要

The influence of rotational speed upon the Marangoni convection in axially independent rotating liquid systems with a free surface and an angular temperature distribution was investigated. Under the action of rotation the vortices move in the direction of the centrifugal acceleration, and exhibit increased velocity distribution and a shifting of the nodal lines of the circumferential velocity component in the direction of the centrifugal acceleration. For cases with an outside free surface, additional vortices appear in a certain Bond-number range depending on the diameter ratio and the applied temperature distribution. Below and inside this range, the magnitude of the velocity distribution decreases, while above the increase of the velocities of the liquid is quite pronounced. This effect may indicate small rotation for crystal growth experiments, in order to minimize striations.