3. A catalyst having an average diameter 100 micron and density 1.65g/cm3 is used to contact a hydrocarbon vapor in a fluidized bed at 900F and 1atm. At rest the bed has a porosity of 0.35 and a height of 3ft. At operating conditions, the fluid viscosity is 0.02cP and its density is 3.36103g/cm3. (a) Determine the superficial gas velocity necessary to fluidize the bed (ans: Vmf=0.00943 ft/s) (b) Does aggregative fluidization occur? (ans: 1822>100 ) (c) If the expanded height of fluidized bed is twice that of a stationary bed ( L/Lmf=2), calculate the corresponding fluid velocity (ans: V0=0.1811ft/s )