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where D is the drum diameter (m), L is the drum length (m), S is the fraction of the critical speed (see Sect. 8.4.1), F is the inlet air flow rate (kg-dry-air s-1), and Hin is the inlet air humidity (kg-vapor kg-dry-air-1).

A much simpler equation, given as a general approximation for linear flow of air past a surface, is (Geankoplis 1993):

where F is the inlet air flow rate (kg-dry-air s-) and Ag is the cross-sectional area of the headspace gases normal to the direction of gas flow (m2).

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