LONGITUDINAL DISPERSION COEFFICIENT OF LIQUID IN THREE-PHASE FLUIDIZED BED FOR GAS-LIQUID-SOLID SYSTEMS

抄録

The longitudinal dispersion coefficient of liquid, E, , was measured in three-phase fluidized beds 12 and 19 cm in diameter. The data of Ef, were correlated by expanding the equation for liquid dispersion in the bubble column, and the following equations were obtained.
U_g <9cm•s^-1: U_gD_T/E_l = (1 + v_l/U_l)^0.40Bo0.225Pe(BC)
U_g > 25 cm•s^-1: U_gD_T/E_l = Pe(BC) In the range of U_g = 9-25 cm•s^-1, E_l was approximated by connecting the above equations. The notations are:
Pe(BC)=(η_l/η_w)^0.07[13(U_g/√gD_T)/{1+6.5(U_g/√gD_T)^0.8}]
Bo=gd²_pp_l/σ, D_T = diameter of bed, d_p = diameter of solid particles, g = acceleration due to gravity, U_g = superficial gas velocity, U_l = superficial liquid velocity, v_t = terminal velocity of solid particle, η_l = viscosity of liquid, η_w = viscosity of water, P_l = liquid density and σ = surface tension.