２成分混合媒体のプール沸騰における沸騰熱伝達特性

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  • Characteristics of Heat Transfer during Nucleate Pool Boiling of Binary Mixtures.
  • 2セイブン コンゴウ バイタイ ノ プール フットウ ニ オケル フットウ ネ

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Experimental studies have been made on heat transfer on a horizontal platinum wire during nucleate pool boiling in nonazeotropic refrigerant binary mixtures at pressures of 0.25 to 0.7 MPa and at heat fluxes up to CHF. The boiling feature of the mixtures and the single-component substances was observed by photography. The relationship between the boiling behavior and the reduction of heat transfer coefficient in binary mixtures is discussed in order to propose a correlation useful for predicting the present experimental data over a wide range of low to high heat fluxes. It is shown that the correlation is applicable to alcoholic mixtures. The physical meaning of k, which was introduced to evaluate the effect of heat flux on the reduction of heat transfer coefficient, is clarified based on the measured nucleate pool boiling heat transfer data and the visual observation of the boiling features.

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