Spherical catalyst pellets 4mm in diameter are to be fluidized with nitrogen at 101.3kPa at 60⁰C. The density of the catalyst particles is 960 kg/m³. The molecular weight of nitrogen is 29kg/kmol. If it is assumed that the point of incipient fluidization is reached at emf=0.430 calculate the minimum fluidization velocity in the vessel. Nitrogen is considered here to be an ideal gas with

u nitrogen = 0.0000207Ns/m2

R=8.314