JOURNAL OF CHEMICAL ENGINEERING OF JAPAN · 1985 · 14 citations · 0 references
EngineeringMechanical EngineeringPhysicsFluid DynamicsFluid MechanicsTransport PhenomenaBubble DynamicsBubbly FlowFluid PropertiesFluidized Bed ReactorsGas-liquid FlowPacked Bed FlowBubble Terminal VelocityDispersion CoefficientDispersion ExperimentsFluidized Bed HydrodynamicsFluidized BedsGas-solid HydrodynamicsLongitudinal DispersionTerminal Velocity
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. Ug <9cm•s-1: UgDT/El = (1 + vl/Ul)0.40Bo0.225Pe(BC) Ug > 25 cm•s-1: UgDT/El = Pe(BC) In the range of Ug = 9-25 cm•s-1, El was approximated by connecting the above equations. The notations are: Pe(BC)=(ηl/ηw)0.07[13(Ug/√gDT)/{1+6.5(Ug/√gDT)0.8}]Bo=gd2ppl/σ, DT = diameter of bed, dp = diameter of solid particles, g = acceleration due to gravity, Ug = superficial gas velocity, Ul = superficial liquid velocity, vt = terminal velocity of solid particle, ηl = viscosity of liquid, ηw = viscosity of water, Pl = liquid density and σ = surface tension.