Effects of Solutally Dominant Convection on Physical Vapor Transport for a Mixture of Hg 2 Br 2 and Br 2 under Microgravity Environments

The convective flow structures in the vapor phase on earth are shown to be single unicellular, indicating the solutally dominant convection is important. These findings reflect that the total molar fluxes show asymmetrical pat- terns in a viewpoint of interfacial distributions. With decreasing the gravitational level form 1 g0 down to 1.0 × 10 -4 g0, the total molar fluxes decay first order exponentially. It is also found that the total molar fluxes decay first order expo- nentially with increasing the partial pressure of component B, PB (Torr) form 5 Torr up to 400 Torr. Under microgravity environments less than 1 g0, a diffusive-convection mode is dominant and, results in much uniformity in front of the crystal regions in comparisons with a normal gravity acceleration of 1 g 0 .