A STUDY OF THE EFFECT OF LIQUID-INDUCED FORCES ON GAS-SOLID FLOW BY A COMBINED CONTINUUM AND DISCRETE MODEL

Numerical experiments are carried out to simulate the gassolid flow in a packed bed with lateral gas blasting by a combined continuum and discrete model. The liquidinduced forces between neighbor particles are considered to be composed of two components: capillary and viscous. The results are analyzed in terms of gas-solid flow pattern, pressure drop fluctuation and microdynamic force distribution. It is shown that with the addition of water, the motion of particles is significantly suppressed either under raceway or fluidization conditions. In particular, particles tend to form agglomerates, which results in an enlarged stagnant zone and an increased fluctuation of bed pressure drop. The results suggest that the viscous component should be taken into account for gas-solid flow systems with high relative velocities between particles.