Evoltion of convection pattern during the solidification process of a binary mixture: effect of initial solutal concentration

摘要

The evolution of convection pattern during the dolidification of a binary mixture of ammonium chloride and water in a rectangular chamber was investigated experimentally. The solidification was carried out under a constant coolant temperature of -20 deg.C along the vertical walls of the test camber. The convection patterns were obtained with the particle image velocimetry technique. The temperature distribution in the camber was measured with a thermocouple rake. The initial concentrations of ammonium chloride ranged from 10 to 22 wt/100. The present paper presents detailed description of the transient evolution of the convction pattern during the Solidification process.