Abstract
Film condensation of binary-mixture laminar flows in a vertical channel of variable circular cross-section is studied by employing the integral method for the vapor flow and the Nusselt model for the liquid film flow. Effects of the channel geometry, vapor flow speed, vapor flow direction and the type of binary mixture on condensation behavior are predicted. The behavior is affected appreciably by the liquid-vapor equilibrium characteristics and the mass transfer process in the vapor flow. Nozzle-type flows yield larger values of local condensation rate, although the channel geometry has not a considerable effect on the overall condensation rate. The flow direction has an appreciable influence on the condensation rate and film thickness.
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