Particle dispersion and Fluctuations in Viscous Liquid-Solid Fluidised beds

摘要

Particle dispersion and fluctuations were investigated in a liquid-solid fluidised bed with viscous liquid media by employing the relaxation method based on the stochastic model. The bed expansion or contraction during the transient state was analysed by means of the histogram of pressure drop variation with elapsed time. The relaxation behaviour of the liquid-solid fluidised bed appeared to be heterogeneous followed by homogeneous expansion or contraction. Effects of liquid velocity ((4), particle size (dp), liquid viscosity (μ_L) and liquid holdup or bed porosity (ε_l) on the fluctuating frequency (F) and dispersion coefficient (Dp) of fluidised solid particles were examined. The values of F and D_p increased with an increase in d_P but decreased with μ_L and exhibited local maxima with variations of U_L and ε_L. The flow pattern of solid particles could be changed from uniform or pseudo-homogeneous to turbulent random behaviour with an increase in the liquid velocity and liquid holdup or bed porosity.