The present study performs an analytical calculation on the problem of film condensation on a flat plate by taking into account the shear forces at the liquid-vapor interface. Based on the gravitational and interfacial shear forces applied to the liquid film, two limiting cases are investigated in calculating the liquid film thickness and the Nusselt number. The first case represents film condensation with high gravitational forces compared to interfacial shear ones while the second case considers high interfacial shear forces compared to gravitational ones. With the aid of these two limiting cases, an expression can be derived as a function of two dimensionless groups for the case of the two forces having comparable values to each other.

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