Abstract
Experiments on film condensation including noncondensable gas in an enclosed chamber have been carried out to clarify the effects of molecular weights of vapor and noncondensable gas and the convective motion induced by the vapor flow. From the experimental results of R113-air and CH3OH-mixed gas of He and Ar, it is shown that the separation of vapor and gas in the main flow is realized when the direction of gas flow in free convective boundary layer driven by concentration distribution of gas is the same as that of supplied vapor, whereas the homogeneous main flow occurs in the case of counter direction. It is also shown that in case of the separation of vapor and gas in the main flow the heat transfer coefficient is higher than that for an homogeneous main flow.
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