Page 192 - Packed bed columns for absorption, desorption, rectification and direct heat transfer
P. 192
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where the factor C w expresses the hydraulic status of a wetted packing
Cw can be found experimentally either directly by pressure drop tests or by
evaluation of Co by means of the following expression:
y/ j
on the basis of holdup measurements and by determination of the values of ^
§
2
v
and x - o i the kinematic viscosity of reference liquid (water), m /s.
For calculating the pressure drop of irrigated packings, Billet [177]
offered the following equation:
(31)
where the resistance factor of the irrigated packing is given by the equation
(32)
where C p is a constant called "packing factor for pressure drop" depending on
the type and dimensions of the packing. Its values for different packings are
presented in Table 1. The wetting factor W, in the equation is given by the
expressions:
