FLUID & PARTICLE MECHANICS (Chemical Engineering) Problem!

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3.2 (a). An air stream at 20C and atmospheric pressure is fed at 1200 m/h to a 1.5-m diameter gas absorption column, packed with 3.6 m of 10-mm Raschig rings in order to collect solvent remaining from a previous operation. The direction of flow for both fluid phases is downwards and 5 kg/min of solvent is to be recovered from the bottom of the column. Estimate the total pressure loss through the column. DATA: Raschig ring's outside diameterxinside diameterxlength = 10x7x10 mm Voidage of packing = 0.7 Solvent: density = 1840 kg/m; viscosity = 30 cp Air (20C, 1 atm): density = 1.206 kg/m3; viscosity = 0.018 cp = (b). Repeat the calculations in part (a) for a similar column, packed with 3.6 m of 13-mm ceramic Berl saddles having specific surface area (as) of 465 m2/m3 and packing voidage of 0.62 Approx. Ans: (a) 280 Pa (b) 100 Pa