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首页> 外文期刊>Heat Transfer Engineering >Two-Phase Frictional Pressure Drop and Flow Boiling Heat Transfer for R245fa in a 2.32-mm Tube
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Two-Phase Frictional Pressure Drop and Flow Boiling Heat Transfer for R245fa in a 2.32-mm Tube

机译：2.32毫米管中R245fa的两相摩擦压降和流动沸腾传热

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摘要

Experimental two-phase frictional pressure drop and flow boiling heat transfer results are presented for a horizontal 2.32-mm ID stainless-steel tube using R245fa as working fluid. The frictional pressure drop data was obtained under adiabatic and diabatic conditions. Experiments were performed for mass velocities ranging from 100 to 700 kg m~(-2) s~(-1), heat flux from 0 to 55 kW m~(-2), exit saturation temperatures of 31 and41℃, and vapor qualities from 0.10 to 0.99. Pressures drop gradients and heat transfer coefficients ranging from 1 to 70 kPa m~(-1) and from 1 to 7 kW m~(-2) K~(-1) were measured. It was found that the heat transfer coefficient is a strong function of the heat flux, mass velocity, and vapor quality. Five frictional pressure drop predictive methods were compared against the experimental database. The Cioncolini et al. (2009) method was found to work the best. Six flow boiling heat transfer predictive methods were also compared against the present database. Liu and Winterton (1991), Zhang et al. (2004), and Saitoh et al. (2007) were ranked as the best methods. They predicted the experimental flow boiling heat transfer data with an average error around 19%.
机译：给出了使用R245fa作为工作流体的水平2.32毫米内径不锈钢管的实验两相摩擦压降和流动沸腾传热结果。摩擦压降数据是在绝热和绝热条件下获得的。进行了质量速度从100到700 kg m〜（-2）s〜（-1），热通量从0到55 kW m〜（-2），出口饱和温度分别为31和41℃以及蒸汽质量的实验。从0.10到0.99。测量了压降梯度和传热系数，范围为1至70 kPa m〜（-1）和1至7 kW m〜（-2）K〜（-1）。发现传热系数是热通量，质量速度和蒸汽质量的强函数。将五种摩擦压降预测方法与实验数据库进行了比较。 Cioncolini等。 （2009）方法被认为是效果最好的。还比较了六种流动沸腾传热预测方法与本数据库。 Liu and Winterton（1991），Zhang等。 （2004）和Saitoh等。 （2007年）被评为最佳方法。他们预测了实验流沸腾传热数据，平均误差约为19％。

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  • 来源
    《Heat Transfer Engineering》 |2011年第14期|p.1139-1149|共11页
  • 作者

    CRISTIANO B. TIBIRICA; GHERHARDT RIBATSKI;

  • 作者单位

    Escola de Engenharia de Sao Carlos, University of Sao Paulo, Sao Carlos, SP, Brazil;

    Escola de Engenharia de Sao Carlos, University of Sao Paulo, Sao Carlos, SP, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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