Abstract
In this work, an analytical study is made on the process of forced-convection-dominated laminar-film condensation on an inclined circular tube for a pure saturated vapour with vertical downflow. The resultant partial differential equation for the local film thickness has been solved analytically by applying the method of characteristics. Thus, an explicit analytical solution; in closed-form, has been obtained for calculating the local and average Nusselt numbers. The general solution yields, in special cases, the known analytical solutions of vertical and horizontal tubes. The results show that an optimum inclination of the tube, at which the rate of condensation on the whole surface is maximum, is a function of the ratio L/D.
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