Abstract
The primary purpose of this paper is to show that the criticisms by Tsotsas and Schlünder (1988) of an earlier paper (Gunn, 1969) are based upon elementary mathematical errors of the part of Tsotsas and Schlünder. A summary of experimental data on axial dispersion in liquids and gases shows that the dependence of the axial dispersion coefficient upon the Schmidt group predicted by Tsotsas and Schlünder is not observed despite the large number of emperical factors in their expressions. In particular, the strong dependence of the axial Peclet group upon the Schmidt group for axial dispersion in liquids predicted for Re > 1 is not observed, since the consensus of expirimental data is that for this range the dependence of Pe upon Re is slight. The experimental dependence of Pe upon Re for different values of the Schmidt group agrees with the expressions of Gunn (1969)
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