0065 which is very low the fractional entrainment is

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Unformatted text preview: (6-70) and (6-72), the froth height in the downcomer = hdf =(ht + hl + hda) / 0.5 Estimate the head loss for flow under the downcomer from Eq. (6-71). Area for flow under the downcomer apron = Ada = Lwha = 42.5(2 - 0.5) = 63.8 in2 = 0.433 ft2 59.4 For the top tray, qL = 59.4 gpm. hda = 0.03 100(0.433) hdf = (4.26 + 0.74 + 0.056) / 0.5 = 10.1 in. liquid 2 = 0.056 in. liquid 2 98.3 For the bottom tray, qL = 98.3 gpm. hda = 0.03 100(0.433) hdf = (2.88 + 1.22 + 0.155) / 0.5 = 8.5 in. liquid = 0155 in. liquid . Exercise 7.49 Subject: Tray hydraulics for methanol-water separation. Given: Data from Exercise 7.41, except that feed rate is increased by 30%. Find: (a) Percent of flooding. (b) Tray pressure drop in psi. (c) Entrainment rate. (d) Downcomer froth height. Is operation acceptable or should packing be used in one or both sections? Analysis: Use the material balance from Exercise 7.41. Make calculations at the top and bottom trays. But take into account the 30% increase in all flow rates. (a)...
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This note was uploaded on 09/08/2008 for the course CHE 244 taught by Professor Selebi during the Spring '06 term at Lehigh University .

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