C221 Study on Heat Transfer from Hot Water to Air with Evaporation (2_<nd> Report)

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  • C221 温水から空気への蒸発を伴う熱伝達に関する研究(第2報)(OS9 熱・流動(5))

Abstract

Heat transfer from hot water flow to cold air flow was examined. In the present study, the air flow was in turbulent flow condition. When the heat flux from the water flow to the air flow is divides into two terms of an evaporation term and a convection term, the evaporation term is much higher than the convection term, approximately 80 〜 60 % of the total heat flux since latent heat is taken into the air flow by evaporating vapor. The convection term was approximately two times of the single-phase heat transfer rate with no evaporation. By making use of the analogy between the mass transfer and the heat transfer, and the single-phase heat transfer correlation, the predicting method of the heat transfer rate with the evaporation was developed.

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