Abstract
For condensation from a vapour-gas mixture flowing parallel to a plane horizontal condensing surface and normal to a horizontal tube, approximate theoretically-based equations are obtained relating the mass flux of vapour to the condensing surface (condensation rate) to the free-stream and condensate surface conditions. These may be used with suitable equations, giving the heat flux (or condensation rate) in terms of the temperature drop across the condensate film, to calculate the heat flux for given free-stream velocity, composition and temperature and condenser surface temperature. The equations are designed to be correct for the limiting cases of zero and infinite condensation rate. For the flat-plate case the present result agrees very closely with earlier numerical solutions covering a wide range of condensation rates and for various values of Schmidt number. For the horizontal-cylinder case the present result is in good agreement with experimental data for steam-air mixtures covering wide ranges of velocity, composition, condensation rate and pressure.
Published Version
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