The mass-transfer coefficient was predicted using Equation 3
and compared to their measured data. The analogy was a factor
of 3 less than their experimental data! Varma et al. (1978)
formulated a correlation based on the moist air enthalpy potential,
the specific humidity gradient from the air to the plate, and
the Re number. The correlation agreed within ±20% of their
experimental data. Their formulation is multiplicative in form
and is applied as a factor to the heat- and mass-transfer analogy
as follows: