Abstract
Both heat and mass transfer in the gas phase and heat transfer in the liquid phase are examined experimentally for film condensation of organic binary mixtures such as ethanol-water and methanol-water. Experimental results on average heat flux, gas-liquid interface temperature and liquid-phase Nusselt number are compared with the analytical solutions based on a stagnant film theory and heat transfer relationships for film condensation from a pure vapor. Experimental results on heat transfer agree well with the analytical solutions, except that the liquid-phase Nusselt number in experimental results in the condition of low mass fraction of water is considerably higher than that in analytical solutions. This high value of the liquid-phase Nusselt number is considered to be caused by dropwise condensation in liquid phase. However, its effect on the tube bundle is not so remarkable compared with that in gravity-controlled condensation on a vertical surface, This is considered to be caused by the condensate inundation effect.
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