Page 127 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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and

(23)

where /? = —f-, and D c is the axial mixing coefficient in the measurement cell.
A,
The equations presented above give the possibility to determine the
Bodenstein number for the liquid phase by means of an iteration procedure.
For determination of fi, it is necessary to carry out an experiment for
obtaining the value of Bodenstein number for the cell only. The investigations
are carried out on the same installation but without the cylinder with the
packing. The value of fi can be calculated [74] by the equation:

(24)

4 is the way of the liquid phase in the measurement cell in m;
T m~ measured average integral residence time for the system packing and
measurement cell, s;
T v
Ek ' ^ ^rage integral residence time for the measurement cell, s;
Boifc - Bodenstein number for the measurement cell.
The average integral residence times (r^and T Sk) can be determined
by the equation:

]t.C(t)dt
JO (25)
x
\C(t)dt