# 005 m 25 estimate hl from eq 6 123 using the following

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Unformatted text preview: temperature to 207oF or 370 K and viscosity. For water, viscosity at 25oC (298 K) = 0.90 cP and at 370 K, viscosity = 0.26 cP. Therefore, 370 0.90 DMeOH = 150 10 -5 . = 6.4 10-5 cm2/s 298 0.26 From Eq. (6-132), for NOR PACK, using SI (instead of American Engineering) units, 1 1 HL = CL 12 = 0.456 1/ 6 4hL DL au L 1/ 2 uL a a 1 1 = aPh 1.08 12 1/ 6 4(0.0269)(0.947) (6.4 10 -9 )(86.8)(0.0228) 1/ 2 0.0228 86.8 a aPh a m 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 0.947 =4 = 0.0436 m = 0.143 ft a 86.8 Reynolds number = N Re L , h = u L d h L (0.0228)(0.143)(62.4) = = 1120 L [(0.27)(0.000672)] Exercise 7.52 (continued) Analysis: (c) at the bottom of the column (continued) Take the surface tension of water at 207oF as = 60 dynes/cm = 0.00411 lbf/ft or 0.00411(32.2) = 0.132 lbm/s2 Weber number = N WeL ,h ( 0.0228 ) (62.4)(0.143) = 0.035 u 2 d = L L h = 0.132 2 2 Froude number = N FrL , h (...
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