A mathematical model is developed for the study of external turbulent film
condensation of pure vapors flowing downward and normal to the axis of the condenser
tube with constant heat flux condition maintained at the tube wall. The magnitude of
interfacial shear is estimated for a given external flow condition of the vapor with the
help of Colburn’s analogy. The average condensation heat transfer coefficients for
different system conditions are evaluated. The present theory is compared with the
available experimental and theoretical data in the literature and is found to be
satisfactory
