PHYSICAL VAPOR TRANSPORT OF ZINC-TELLURIDE BY DISSOCIATIVE SUBLIMATION

We investigate the effects of convection on physical vapor transport o f zinc-telluride by dissociative sublimation computationally and exper imentally. We show by solving the coupled set of conservation equation s for the corresponding experimental conditions that the flow field is advective-diffusive, This result proves that the traditional approach of calculating the mass flux assuming one-dimensional (1D) flow for l ow vapor pressure systems is indeed correct. The limit of low Grashof numbers Gr --> 0 yields identical results to the 1D case. This implies that for the model considered, a microgravity condition would not aff ect the transport.