Page 125 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

120

Bo,,

A cr^; A T
Ek
H

AT

(a) (b)

Fig. 15. Values determined from the impulse answer of the whole system (a) and of the
measurement cell only (b).

The signal from the delta function at section 1, Fig. 15 is independent of
the measurement cell, but cannot be measured without it. After Bishoff [85] the
change of the dispersion and of the residence time because of the measurement
cell can be described by the equations:

• +
Bo Ik
(18)
4 exp(-B O exp(Bo )-5]\
u
Lk

and

= tJl—J—[l- xp(-Bo )i. (19)
e
a
[ Bon J

The values of 4 and Bon are obtained by the measurements with the
cr^,
measurement cell using equations (17) and (18). The values of t Sk, At Ek
2
and A<j tk for the measurement cell, shown in Fig. 14, are presented in Fig. 16.