Page 254 - Packed bed columns for absorption, desorption, rectification and direct heat transfer
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K La = 0.0085L, (148)
where L m is the molar liquid flow rate. In the last two equations all constants are
in British units.
Norman and Sammak [220], using a disk column, obtained the equation
0.61 / \0J0f , , \ft/7
diA) (149)
where L] is the peripheral liquid flow rate in kg/(m.s) and dg is the diameter of
the discs in m. Equation (149) covered a range of viscosities from 0,4 to 20 cP.
Onda et al, [141] calculate the liquid-side mass transfer coefficient from
its volumetric value and the wetted surface area of the packing, determined by
their own equation (93).
5 s
Sh L=0.01Rel Sc° l (150)
Shulman et al. [49] proposed:
(151)
where F/ is calculated by the expression (139) and Rei with the specific surface
area of the packing a.
Yoshida and Koyanagi [138] calculate the Reynolds number wilh the
4L
effective surface area {Re^ = ) and obtained the equation;
(152)
