The convection-condensation heat transfer of vapor-gas mixtures in a vertical tube was studied theoretically and experimentally. The effects of the condensation of a small amount of water vapor (8 to 20%) on heat transfer in a vertical tube were discussed. Comparisons show that theoretical solutions obtained through modified film model and experimental results are in good agreement. The results show that the condensation heat transfer of a small amount of water vapor and single-phase convection heat transfer in the vapor-gas mixtures are of the same order of magnitude, and these two modes of heat transfer could not be neglected.
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