005910040748 491 l 0350000672 weber number

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Unformatted text preview: rcise 7.52 (continued) Analysis: (c) at the top of the column (continued) Now estimate the value of HG from Eq. (6-133). Estimate the gas diffusivity from Eq. (3-36), where from Table 3.1, . . . V = 131 for water, and V = 15.9 + 4( 2.31) + 611 = 312 for methanol and molecular weights are 32 for methanol and 18 for water. 0.00143T 1.75 DV = DAB = 1/ 2 1/ 3 1/ 3 2 2 P ( V ) A + ( V )B (1/ M A ) + (1/ M B ) 2 1/ 3 1/ 3 2 (13.1) + ( 31.2 ) (1/18) + (1/ 32) Use the following additional properties and parameters, together with = 1.1 x 10-2 cP and V u = 0.0688 lb/ft3 , where from Eqs. (6-134) and (6-135), N ReV = V V and N ScV = V aV V DV (1) CV uV , m/s (NSc)V (NRe)V NOR PAC 0.322 3.96 0.36 4,560 Montz 0.422 2.56 0.36 850 = 0.00143(350)1.75 1/ 2 = 0.28 cm 2 /s From Eq. (6-133), for NOR PAC, using SI units, 1 1/ 2 4 HG = ( - hL ) CV a4 1/ 2 (N ) (N ) -3/ 4 -1/ 3 ReV ScV uV a DV aPh -3/ 4 1 1/ 2 4(0.947) = ( 0.947 - 0.0162 ) 0.322 86.84 For Montz, 1/ 2 ( 4, 560 ) ( 0.36 ) -1/ 3 (3.96)(86.8) = 0.34 m (0.28 10-4 )(71....
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