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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurements of critical heat flux and liquid-vapor structure near the heating surface in pool boiling of 2-propanol/water mixtures
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Measurements of critical heat flux and liquid-vapor structure near the heating surface in pool boiling of 2-propanol/water mixtures

机译：测量2-丙醇/水混合物在池沸腾过程中受热面附近的临界热通量和液体-蒸汽结构

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摘要

Saturated pool boiling of 2-propanol/water mixtures on a 12 mm diameter horizontal disk under atmospheric pressure was investigated. The CHF of the mixtures increased up to 1.7 times the CHF of water at 3.0-4.7 mol% concentrations of 2-propanol. To examine the mechanism of the CHF enhancement in the mixtures, liquid-vapor structures close to the heating surface were measured using a conductance probe. It was found that in the boiling of the mixtures, liquid-vapor structures show strong non-uniformity in the radial direction of the heating surface. The void fractions at 0.1-1 mm above the heating surface are small at the central region and large near the periphery of the heating surface. The liquid layer between the vapor mass and the heating surface is considerably thicker than that of water at the central region and becomes thinner near the periphery of the heating surface. This thicker liquid layer is likely to be the cause of the CHF enhancement in the 2-propanol/water mixtures.
机译：研究了在大气压下在直径为12 mm的水平盘上2-丙醇/水混合物的饱和池沸腾。在2-丙醇浓度为3.0-4.7 mol％的情况下，混合物的CHF升高至水的CHF的1.7倍。为了检查混合物中CHF增强的机理，使用电导探针测量了靠近加热表面的液体-蒸汽结构。已经发现，在混合物的沸腾中，液体-蒸汽结构在加热表面的径向上显示出很强的不均匀性。在加热表面上方0.1-1 mm处的空隙率在中心区域较小，而在加热表面的外围附近较大。蒸气质量和加热表面之间的液体层比中心区域的水要厚得多，并且在加热表面的周边附近变薄。这种较厚的液体层很可能是2-丙醇/水混合物中CHF升高的原因。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第8期|1554-1562|共9页
  • 作者

    Hiroto Sakashita; Ayako Ono; Yuta Nakabayashi;

  • 作者单位

    Division of Energy and Environmental Systems, Graduate School of Engineering, Hokkaido University, North 13 West 8, Kita-ku, Sapporo 060-8628, Japan;

    Division of Energy and Environmental Systems, Graduate School of Engineering, Hokkaido University, North 13 West 8, Kita-ku, Sapporo 060-8628, Japan;

    Division of Energy and Environmental Systems, Graduate School of Engineering, Hokkaido University, North 13 West 8, Kita-ku, Sapporo 060-8628, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    critical heat flux; binary mixtures; pool boiling; conductance probe; macrolayer;

    机译：临界热通量;二元混合物池沸腾;电导探针宏层;

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