Page 172 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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The arithmetical diameter of the packing D a is the diameter of a
spherical packing with the same value of e and a as the real packing in the
column. It is easy to see that it is calculated by the equation:

D a=6(l-B)/a. (12)

For determination of £ in Eq. (7), Aerov [103] recommended equation
like that of Ergun [104].

^ + 2.34, (13)
Re G

where

S
*o=- s •
HQ - dynamic gas viscosity in Pa.s.
For determination of the pressure drop of ring random dry packings,
Zhavoronkov et al. [20] presented the equations:

at Rea<40

04)
e G 2

atReo>40

= —j} 1—• ( 15 )

The average deviation of this equation is 17%.