Page 286 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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experimental error over the loading point is always greater than below it, and
that it increases getting near the flooding point.
The values of Fr L, Ga L and Rei in Eqs. (183)-(186) are defined with 4,
as a geometrical parameter of the packing.
A comparison between the dynamic holdup over the loading point for
the packings presented in Table 26 and the values calculated by equation (186)
is presented in Fig. 57.

10-2
8 10" 1
d'cal
Fig. 57. Comparison of the experimental data for dynamic holdup under and over the
loading point and the results calculated by Eq. (186). (See Table 26 for explanation of
the symbols.)

3.2.2.1.2.3. Effective surface area of packings with vertical smooth walls
To predict the effective surface area of packings with vertical smooth
walls, Zhavoronkov et al. [87] proposed the equation:

8 + 0.8L h), (188)

3 2
where 1* is the liquid superficial velocity in m /(m .h). The constants are the
same for different packing sizes. The influence of the viscosity is not
investigated based on practical absence of influence in ease of random packings.