有機系2成分蒸気の鉛直管内下降流凝縮伝熱特性

抄録

Both heat and mass transfer in the gas phase and heat transfer in the liquid phase are examined experimentally for turbulent film condensation of organic binary mixtures flowing downward inside a vertical tube. For average heat flux, gas-liquid interface temperature and liquid phase Nusselt number, experimental results are compared with the analytical solutions based on stagnant film theory and heat transfer relationships for turbulent film condensation of pure vapors. The experimental results regarding heat transfer agree well with the analytical solutions, except that the liquid phase Nusselt number for ethanol and water mixtures is far higer in the experimental results than in the analytical solutions. This high liquid phase Nusselt number is considered to be caused by dropwise condensation in the liquid phase.