A gas is pumped in a packed bed as shown in Figure 1. The bed is packed with solid particles and the shape of a single particle is shown in Figure 2. Given the following data: (Total 19 points) 4x10-5 kg/m.s D = 35 cm, h = 55 cm, a = 12 mm, b = 18 mm, gas density and viscosity are 1.1 kg/m3 and respectively. Answer the following questions: (Please note the figures are not drawn to scale) a. Find the effective particle diameter. (4 points) b. If the number of particles in the bed is 7000, calculate the void fraction in the bed. (4 points) c. If the volumetric flow rate is 0.2 m3/s, , determine if the flow is laminar or turbulent and state your reason. (5 points) d. If the density of the solid particles is 1200 kg/m3, the minimum fluidization length is the same as the height of the bed and the porosity at minimum fluidization is the same as the void dron fraction find the nressure at Solld Particles h f Gas Figure 1 A solid particle Figure 2