Page 87 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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A r value of A under the loading point;
2
3
a- specific packing area, m /m ;
2 3
a e- effective (interface) area, m /m ;
2
a tt = coefficient of temperature conductivity, m /s;
c.p
a,- dimensionless parameter, constant of similarity or scale multiplier;
2 3
a*,- wetted packing area m /m ;
a T - similarity constant for time;
"w U
Bo G = ;—Bodenstein number for the gas phase;
e(l-H d).D G

Bo L = r - Bodenstein number for the liquid phase;
H d.D L
3
3
C- concentration, kg/m or kmol/m ;
3
3
C G - concentration of the gas phase, kg/m or kmol/m ;
3
3
C GiH- concentration of the gas phase, kg/nm inert gas or kmol/nm inert gas;
3
3
C L - concentration of the liquid phase, kg/m or kmol/m ;
3
C Lb - concentration of the absorbed component in the flow bulk, kmol/m ;
3
3
C G - equilibrium concentration of the gas phase, kg/m or kmol/m ;
3
3
C L - equilibrium concentration of the liquid phase, kg/m or kmol/m ;
Cr indicator of similarity;
Or constant given in Table 1;
Co*- equilibrium concentration of the transferred component in the gas, for
3
example kg/m ;
CL- equilibrium concentration of the transferred component in the liquid phase
3
for example in kg/m ;
2
Cr coefficient of radiation of grey material, W/m ;
0.5
C s = —-—JJ - capacity factor to account for the effect of vapour and
liquid density, m/s',
c L - liquid heat capacity, J/(kg.K);
c p - gas heat capacity at constant pressure, J/(kg.K);
2
D- diffusivity, m /s;
2
DAB- diffusivity in system A-B m /s;
2
DQ- diffusivity for the gas phase, m /s;