Equations - Giddings equation for HETP

Let us write Giddings equation for HETP in the capillary column in a different form, assuming that 

To test the compliance of equation (3-14) with experimental data, one can conveniently write it as follows  

Dg values can be estimated with the aid of the Fuller-Schettler-Giddings equation [36] or by some other calculation method (see, for example, [37]). 

The C values for the chromatographed compounds, as found for two carrier gases on capillary adsorption columns, make it possible to determine separately mass transfer resistance coefficients for the gas phase (C ) and for the adsorption layer (Cyj). These methods were developed earlier for packed columns by Perrett and Purnell [38]. 

De Nijs and de Zeeuw [39] estimated the coefficients for 1,3-butadiene in a capillary adsorption (aluminum oxide) column. They us Giddings equation (3-19). The coefficients were found to be 

---