二成分混合液の核沸騰熱伝達 熱伝達の測定と整理式の評価

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  • Heat Transfer in Nucleate Boiling of Binary Mixtures. Heat Transfer Measurement and Assessment of Available Correlations.
  • 2セイブン コンゴウエキ ノ カク フットウ ネツ デンタツ ネツ デンタツ

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Heat-transfer coefficients in nucleate pool boiling of binary mixtures were measured on a circular copper plate, 40 mm in diameter, for a wide range of heat flux and over the full range of concentrations. Measurements were performed for five mixtures of methanol/water, thanol/water, methanol/ethanol, ethanol/n butanol, and methanol/benzene, each in the saturated state at atmospheric pressure. Measured data were expressed in the form α=Cqn, where a is the heat-transfer coefficient, q is heat flux, and C and n are constants. The validity of available correlations for boiling heat transfer of a binary mixture were assessed on the basis of the measured data. Among five correlations evaluated, the Stephan-Korner correlation is found to be the best although it contains an empirical constant which varied with the mixture.

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