Problem 1. A packed bed of spherical solid particles of density 2500kg/m3, occupies a depth of 1m in a column of 0.225m inside diameter. The mass of solids in the bed is 50kg and the mean diameter of the particles is 1mm. A liquid of density 800kg/m3 and viscosity 0.002 Pa.s flows upwards through the bed. i. Calculate the void fraction of the bed. ii. Calculate the pressure drop across the bed when the volumetric flow rate of liquid 1.44 m3/h Eii. Calculate the pressure drop across the bed when it becomes fluidized with the Emf of 0.61