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首页> 外文期刊>International Journal of Heat and Mass Transfer >Dry-out CHF correlation for R134a flow boiling in a horizontal helically-coiled tube
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Dry-out CHF correlation for R134a flow boiling in a horizontal helically-coiled tube

机译：水平螺旋盘管中R134a流动沸腾的干燥CHF相关性

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摘要

An experimental study was carried out to investigate the R134a dry-out critical heat flux (CHF) characteristics in a horizontal helically-coiled tube. The test section was heated uniformly by DC high-power source, and its geometrical parameters are the outer diameter of 10 mm, inner diameter of 8.4 mm, coil diameter of 300 mm, helical pitch of 75 mm and valid heated length of 1.89 m. The experimental parameters are the outlet pressures of 0.30-0.95 MPa, mass fluxes of 60-500 kg m~(-2)s~(-1), inlet qualities of -0.36-0.35 and heat fluxes of 7.0 × 10~3-5.0 × 10~4 W m~(-2). A method based on Agilent BenchLink Data Logger Pro was developed to determine the occurrence of CHF with a total of 68 T-type thermocouples (0.2 mm) set along the tube for accurate temperature measurement. The characteristics of wall temperatures and the parametric effect on dry-out CHF showed that temperature would jump abruptly at the point of CHF, which usually started to form at the front and offside (270° and 90°) of the outlet cross-section. The CHF values decrease nearly linearly with increasing inlet qualities, while they decrease more acutely with increasing critical qualities, especially under larger mass flux conditions. The mass flux has a positive effect on CHF enhancement, but the pressure has negative one. A new dimensionless correlation was developed to estimate dry-out CHF of R134a flow boiling in horizontal helically-coiled tubes under current experimental conditions and compared to calculated results from Bowring and Shah correlations.
机译：进行了一项实验研究，以研究水平螺旋盘管中R134a干透的临界热通量（CHF）特性。测试部分由直流大功率电源均匀加热，其几何参数为外径10 mm，内径8.4 mm，线圈直径300 mm，螺旋间距75 mm和有效加热长度1.89 m。实验参数为出口压力0.30-0.95 MPa，质量通量60-500 kg m〜（-2）s〜（-1），入口质量-0.36-0.35和热通量7.0×10〜3- 5.0×10〜4瓦m〜（-2）。开发了一种基于Agilent BenchLink Data Logger Pro的方法来确定CHF的出现，沿着管子总共设置了68个T型热电偶（0.2 mm），以进行精确的温度测量。壁温的特性和对CHF变干的参数影响表明，温度会在CHF的点突然跳升，通常在出口横截面的正面和反面（270°和90°）开始形成。 CHF值随着入口质量的提高几乎呈线性下降，而随着临界质量的提高而急剧下降，特别是在较大的质量通量条件下。质量通量对CHF的提高有积极的影响，但压力却有负的影响。开发了一种新的无量纲相关性，以估计在当前实验条件下水平螺旋盘管中R134a流动沸腾的CHF变干，并将其与Bowring和Shah相关性的计算结果进行比较。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第3期|p.739-745|共7页
  • 作者

    C.N. Chen; J.T. Han; T.C. Jen; L Shao;

  • 作者单位

    School of Energy and Power Engineering, Shandong University, Jinan, Shandong Province 250061, PR China,Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA;

    School of Energy and Power Engineering, Shandong University, Jinan, Shandong Province 250061, PR China;

    Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA;

    School of Energy and Power Engineering, Shandong University, Jinan, Shandong Province 250061, PR China;

  • 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

    dry-out CHF; horizontal helically-coiled tubes; boiling heat transfer; r134a;

    机译：干燥瑞士法郎;卧式螺旋管沸腾传热r134a;

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