1. Air is flowing through a packed bed containing a mixture of particles in the following percentages, sizes and shape factors: 20%, 15 mm, shape factor 0.86 35%, 18 mm, shape factor 0.57 15%, 25 mm, shape factor 0.76 30%, 10 mm, shape factor 0.92 The particles have a constant density of 1350 kg/m? The bulk density of the overall packed bed is 900 kg/m. The bed has a diameter of 0.6 m and a height of 2.5 m. The air enters the bed at 25 C and 202.65 kPa abs at the rate of 0.4 kg/s. The average molecular weight of air is 28.97. Air viscosity at the flow conditions is 1.845 X 10Pa.s. Calculate the pressure drop of the air in the packed bed. (Hint: First, guess the outlet pressure, P, of the air flow. If your guess is far away from the resulted AP, repeat your calculations up to 2 trials only.)