Q (3). To clean a sand-bed filter, it is fluidized at minimum conditions using water at 24C. The round sand particles have a density of 2550kg/m3 and an average size of 0.4mm. The sand has the properties given in Table 3.1-2. (a). The bed diameter is 0.4m and the desired height of the bed at these minimum fluidizing conditions is 1.75m. Calculate the amount of solids needed. (b). Calculate the pressure drop at these conditions and the minimum velocity for fluidization. (c). Using 4.0 times the minimum velocity, estimate the bed porosity