Assume that a two-phase flow of air and water can be treated as a homogeneous fluid flow under no slip condition, find the velocity of the fluid flow to fluidise the bed Given diameter = 90mm, bed height 1m, porosity 0.45, surface to volume ratio of 4000. air flow rate 0.0001 m3/s and water flow 0.004 m3/s. (Use properties of air and water).