Thermal Modulation Effects on Thermosolutal Convection in a Vertical Bridgman Cavity

摘要

The effects of oscillatory heating on thermosolutal convection in a cavity heated from below are investigated and discussed. The transient Navier-Stokes equations coupled with heat and mass balances are solved numerically by using a control-volume technique. It is assumed that the interface moves with constant growth velocity. The results show the presence of multiple solutions in response to simultaneous vertical temperature and species concentration gradients applied to the system. In particular, two critical frequencies are identified, one corresponding to low values of the buoyancy ratio N (N approx 1), accompanied with a decrease of flow intensity reaching a minimal value, the other occurring at higher value of N (N(approx)50), accompanied with flow intensity increase reaching a maximal value.