D h packing hydraulic diameter 4 0947 4 00436 m

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Unformatted text preview: 0.0228 ) = 0.000113 u2 = L = gd h 32.2(0.143) From (6-136), aPh -1/ 2 = 1.5 ( ad h ) N Re L ,h a = 1.5 [ (86.8)(0.0436)] ( ) (N -0.2 -1/ 2 We L , h ) (N ) 0.75 FrL , h -0.45 (1120 ) ( 0.035 ) ( 0.000113) -0.2 0.75 -0.45 = 0.92 HL = 0.456 1 = 0.50 m 0.92 From Eq. (6-132), for Montz, using SI units, 1 1 HL = CL 12 = 0.0595 1/ 6 4hL DL au L m 1/ 2 uL a a 1 1 = aPh 1.165 12 1/ 6 4(0.0341)(0.930) (6.4 10 -9 )(300)(0.0150) 1/ 2 0.0150 300 a aPh a aPh To compute (aPh /a), we need for the liquid phase, the Reynolds, Weber, and Froude numbers from equations (6-138), (6-139), and (6-140), respectively, based on the packing hydraulic diameter from (6-137). d h = packing hydraulic diameter = 4 0.930 =4 = 0.0124 m = 0.0407 ft a 300 Reynolds number = N ReL , h = u L d h L (0.0150)(0.0407)(62.4) = = 210 L [(0.27)(0.000672)] Exercise 7.52 (continued) Analysis: (c) at the bottom of the column (continued) Weber number = N WeL ,h ( 0.0150 ) (62.4)(0.407) = 0.0433 u 2 d = L L h = 0.132 2 2 ( 0.0150 ) = 0.000172 uL = = gd h 32.2(0.0407) 2 Froude number = N FrL , h From (6-136), aPh -1/ 2 = 1.5 ( ad h ) N Re L ,h a = 1.5 [ (300)(0.0124)] ( ) (N -0.2 W...
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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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