Q2- Consider a catalyst pellets with 5 mm in diameter are to be fluidized with 46,716 kg/h of air at 1 atm and 80C in a vertical cylindrical vessel. The density of the catalyst particles is 960 kg/m3 and their sphericity is 0.86. If a given quantity of air is just sufficient to fluidize the solids, what is the vessel diameter? Take the voidage, e, as 0.45