Note: Make clear assumptions if required! a) 300kg of solid particles with 0.3m2 cross-sectional area are to be fluidized using air at 25C and a pressure twice that of the atmospheric. Knowing that the mf is 0.42,dp is 12105m and the sphericity is 0.88 , calculate at the minimum fluidization conditions each of the height of the fluidized bed, the pressure drop, and the minimum fluidization velocity. Additional information: Air properties at 25C and 2atm : viscosity =0.01845cP, density =2.374g/l Particles properties: density =1000g/l b) A first order catalytic reaction AB is performed in a fluidized bed reactor operating at 2 bar and 400C with a 10m diameter. The gas enters the bed with a velocity of 720m/hr, while the gas viscosity and diffusivity values are 1.44kg/hr.m and 0.14m2/hr, respectively. The catalyst used inside the reactor has a density of 2500kg/m3 and the particles diameter is considered to be 0.05mm. Estimate the bed height and mass required to achieve 70% conversion. Additional information: Reaction rate constant: 1.0/s volume of the wake per volume of the bubble: 0.6 , bubble diameter: 10cm, voidage of the bed before fluidization: 0.5 , voidage of the bed at minimum fluidization: 0.6 , minimum fluidization velocity: 0.004m/s, volume of solids dispersed in bubble phase: 0.005