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Critical Heat Flux of R134a and R245fa Inside Small-Diameter Tubes

机译：小直径管内R134a和R245fa的临界热通量

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摘要

This article presents new experimental critical heat flux results under saturated flow boiling conditions for a macro-/microscale tube. The data were obtained in a horizontal 2.20-mm inside diameter stainless-steel tube with heating lengths of 361 and 154 mm, R134a and R245fa as working fluids, mass velocities ranging from 100 to 1500 kg/m~2-s, critical heat flux from 25 to 300 kW/m~2, exit saturation temperatures of 25, 31, and 35° C, and critical vapor qualities ranging from 0.55 to 1. The experimental results show that critical heat flux (CHF) increases with increasing mass velocity and inlet subcooling but decreases with increasing saturation temperature and heated length. The data also indicated a higher CHF for R245fa when compared with R134a at similar conditions. The experimental data were compared against four CHF predictive methods and the results of the comparisons are reported.
机译：本文介绍了在宏/微型管的饱和流沸腾条件下新的实验临界热通量结果。数据是在水平内径为2.20mm的不锈钢管中获得的，加热长度分别为361和154mm，R134a和R245fa作为工作流体，质量速度范围为100至1500 kg / m〜2-s，临界热通量从25到300 kW / m〜2，出口饱和温度分别为25、31和35°C，临界蒸汽质量为0.55到1。实验结果表明，临界热通量（CHF）随着质量速度的增加而增加。入口过冷，但随着饱和温度和加热长度的增加而降低。数据还表明，在类似条件下，与R134a相比，R245fa的CHF更高。将实验数据与四种CHF预测方法进行了比较，并报告了比较结果。

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  • 来源
    《Heat Transfer Engineering》 |2013年第6期|492-499|共8页
  • 作者

    CRISTIANO B. TIBIRICA; SYLWIA SZCZUKIEWICZ; GHERHARDT RIBATSKI; JOHN R. THOME;

  • 作者单位

    Escola de Engenharia de Sao Carlos, University of Sao Paulo, Sao Carlos, SP, Brazil, Ecole Politechnique Federate de Lausanne, Swiss Federal Institute of Technology, Lausanne, Switzerland;

    Ecole Politechnique Federate de Lausanne, Swiss Federal Institute of Technology, Lausanne, Switzerland;

    Address correspondence to Professor Gherhardt Ribatski, Escola de Engenharia de Sao Carlos, University of Sao Paulo, Av. Trabalhador Sao Carlense, 400 Centra, Sao Carlos, SP, Brazil;

    Ecole Politechnique Federate de Lausanne, Swiss Federal Institute of Technology, Lausanne, Switzerland;

  • 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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