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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Laminar Film Condensation from Vapour-gas Mixtures in Downward-inclined Parallel-plate Channels

Get access (open in a dialog) DOI: 10.1615/IHTC12.620
6 pages

摘要

A two-phase model is developed to analyze laminar film condensation from mixtures of a vapour and a noncondensing gas in parallel-plate channels. The channel is inclined down from the horizontal and has an isothermal cooled bottom plate and an insulated upper plate. The model under consideration involves the complete two-phase boundary-layer equations including inertia forces, energy convection, interfacial shear, and axial pressure change. A numerical approach for solving the model is described using a marching finite-control-volume method. Results are presented for steam-air mixtures in terms of axial variation of film thickness and local Nusselt number for inclination angles from 0 to 90 degrees. Profiles of velocity, temperature, and gas mass fraction are also presented. Even a small inclination angle can produce a significantly thinner film compared to the horizontal orientation. The detrimental effect of noncondensable gas on the heat transfer rate is relatively greater at lower inclination angles.