GRANULAR THERMAL-DIFFUSION IN FLOWS OF BINARY-SIZED MIXTURES

The revised Enskog theory was employed to analyze granular flows of bi nary-sized mixtures. The governing equations and constitutive relation s were used to investigate granular thermal diffusion a diffusion proc ess resulting from the granular temperature gradient. The granular the rmal diffusion causes the smaller or the lighter particles to concentr ate in the region of the flow with higher granular temperature, and ca uses the larger or the heavier particles to concentrate in a region of lower granular temperature. A granular flow of binary mixtures in an oscillatory no-now system and in a sheared system was examined, and in dicated a complete segregation when the granular thermal diffusion was sufficiently large.