Heat and mass transfer during dewatering of slurries Conference Paper uri icon

abstract

  • On the basis of our fully unsteady model of heat and mass transfer during dewatering of slurry droplets in atmospheric air, the simulations of silica slurry dehumidification under different conditions have been performed and distributions of pressure and fractions within the capillary pores of the wet particle have been predicted. The calculated data show two origins of possible silica particle cracking/rupture: temperature stresses as the result of temperature differences between the particle outer surface and its centre, and mechanical stresses as the result of pressure gradient in the capillary pores of the particle. The procedure for calculation of the stresses is proposed and typical distributions of total stresses during dewatering have been evaluated and presented. From the obtained results it can be concluded that the total tangential stress in the wet particle crust predominates over the radial component in the course of dewatering (in 5รท10 times greater) and the maximum stress value is positive and located at the inner surface of the particle crust.

publication date

  • January 1, 2007