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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 (...
View Full Document

Ask a homework question - tutors are online