The minimum fluidization velocity for a catalyst at the given conditions is to be calculated from the known minimum fluidization velocity at the other conditions. Concept introduction: The minimum fluidization is the condition where the drag force on a particular particle is just equal to or balances the apparent weight of the body. In other words, it is the superficial velocity at which the bed of particle just fluidizes. It is given as, , V ¯ 0M = g(ρ p - ρ) 150μ ε M 3 1 - ε M ( ϕ s D p ) 2 ....... (1) The notations used here are, ρ p = Particle density ρ = Fluid density V ¯ 0M = Minimum fluidization velocity μ = Viscosity of fluid ε M = Minimum Bed porosity D p = Pellet diameter ϕ s = Sphericity of particles g = Acceleration due to gravity The density of fluid is given as, ρ = PM RT ....... ( 2 ) In equation (2), notations used are, P is the pressure at which fluid enters M is the molecular weight of fluid R is the Universal Gas constant T is the temperature of the fluid

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Chapter 7, Problem 7.17P

Interpretation Introduction

Interpretation: The minimum fluidization velocity for a catalyst at the given conditions is to be calculated from the known minimum fluidization velocity at the other conditions.

Concept introduction: The minimum fluidization is the condition where the drag force on a particular particle is just equal to or balances the apparent weight of the body. In other words, it is the superficial velocity at which the bed of particle just fluidizes.

It is given as,

, V ¯ 0M = g(ρ p - ρ) 150μ ε M 3 1 - ε M ( ϕ s D p ) 2 ....... (1)

The notations used here are,

ρp = Particle densityρ = Fluid densityV¯0M = Minimum fluidization velocityμ = Viscosity of fluidεM = Minimum Bed porosityDp = Pellet diameterϕs = Sphericity of particlesg = Acceleration due to gravity

The density of fluid is given as,

ρ = PMRT ....... (2)

In equation (2), notations used are,

P is the pressure at which fluid enters

M is the molecular weight of fluid

R is the Universal Gas constant

T is the temperature of the fluid

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