A continuous fluidized bed 0.7 m in diameter is to be used to heat, from 25 C to 100 C, 0.5 kg/s sand and the required fluidizing air. Data: Air: p=0.9265 kg/m, u = 21.8 x 106 Pa.s Sand: Pp = 2400 kg/m, po = 1440 kg/m", Dp = 795 um, s = 1 Bed: E = 0.4, Emf=0.5 1. Estimate the minimum fluidization velocity (use Wen and Yu correlation) 2. Estimate the superficial air velocity (use V. = 2V mf). 3. Estimate the average bubble rise velocity if N = 100 holes/m and L = 1.2 m. (Hint: estimate an average bubble size halfway up the bed, i.e. at =L/2) 4. Calculate the fraction of the bed occupied by bubbles. 5. Calculate the height of the bed at minimum fluidization 6. Calculate the pressure drop across the fluidized bed