Page 259 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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Table 22. The exponents at the physical values in the equations of different investigators
Authors LatLj D L Pi ML
Higbie [1] +0.33 +0.5 -0.16 -0.16
Sherwood and Holloway [137] +0.54 +0.5 -0.5 -0.04
Knoedler and Bonila [224] +0.7 +0.5 -0.53 +0.53
Van Krevelen and Hoftizer [225] +0.66 +0.66 -0.33 +0.33
Van Krevelen and Hoftizer [133] +0J0 +0.60 -0.40 -0.40
Shulman et al. [49] +0.45 +0.50 -0.50 +0.05
Davidson [54] +0.33 +0.55 -0.17 -0.16
Hikita [99] +0.45 +0.50 -0.17 -0.16
Ctada et [226] +0.66 +0.50 +0.16 -0.82
MohutE [227] +0.75 +0.50 +0.27 -0.80
Stephens and Moris [22S] +0.70 +0.50 -0.50 -0.20
Taylor and Roberts [229] +0.40 +0.50 -0.50 +0.10
Taylor and Roberts [229] +1.00 +0.50 -0.50 +0.50
Norman and Samak [53] +0.61 +0.50 -0.17 -0.44
Mika [55] +0.83 +0.50 -0.99 -0.99
Mika[55] +0.50 +0.50 -0.76 -0.43
Copp and Ponter [230] 1.00 +0.5 1.00 -0.54

It is to be recommended to use this equation together with the equation
for calculation of the effective surface area obtained by the same authors, Eq.
(106).
The equations of Billet [177], Eqs. (143) and (157), are proved by
altogether 2150 measurements at different systems and packings, random and
arranged. Of them 9 are liquid-side controlled, 12 - gas-side controlled and 7-
systems concerning both phases.
Equations for calculating the liquid-side controlled mass transfer
coefficient are proposed also by Emmert and Pigford [247], Vivian and
Peaceman [248], Shulman and Mellish [249], Echard et al. [250], Hughmark
[251], and Singh and von Stockar [252].
Other equations for determination of the liquid- side controlled mass
transfer coefficient of random packings are presented in Table 23.