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首页> 外文期刊>Heat Transfer Engineering >Falling Liquid Film Evaporation in Subcooled and Saturated Water Over Horizontal Heated Tubes
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Falling Liquid Film Evaporation in Subcooled and Saturated Water Over Horizontal Heated Tubes

机译：水平加热管在过冷和饱和水中下降的液膜蒸发

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摘要

This paper presents an experimental study of heat transfer and film thickness behavior in falling liquid water film evaporation technology over horizontal tubes. Liquid distribution systems have also been evaluated. The experimental setup consisted of two horizontal 0.019-m OD stainless-steel tubes, 0.194 m in length. Reynolds numbers in the 160-940 range were tested in both subcooled and saturated liquid regimes. For the liquid distribution system study, several distributor geometries were tested in order to develop the least disturbed film over the tubes. An intrusive method was used for measuring the liquid film thickness in the laminar regime and the measured values were compared with the theoretical prediction computed from the Nusselt equation. An experimental heat transfer correlation was obtained and compared with previous ones obtained by other authors. In addition, the local heat transfer coefficient was observed to be always higher at the horizontal tube top region for all operational conditions (on the order of 14 kW/m~2-°C). Finally, the use of a liquid storage distribution system along with the installation of a wire mesh to obtain an uniform liquid distribution for all Reynolds numbers tested.
机译：本文介绍了水平管降液水膜蒸发技术中传热和膜厚行为的实验研究。液体分配系统也得到了评估。实验装置由两个水平的0.019-m外径，长度为0.194 m的不锈钢管组成。在过冷和饱和液体状态下都测试了160-940范围内的雷诺数。对于液体分配系统的研究，测试了几种分配器的几何形状，以便在管子上形成最少受干扰的薄膜。使用侵入式方法测量层流状态下的液膜厚度，并将测量值与根据Nusselt方程计算的理论预测值进行比较。获得了实验传热相关性，并将其与其他作者先前获得的相关性进行了比较。此外，在所有操作条件下，水平管顶部区域的局部传热系数始终较高（约为14 kW / m〜2°C）。最后，使用液体存储分配系统以及金属丝网的安装以获得所有测试的雷诺数的均匀液体分配。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|361-376|共16页
  • 作者

    Beethoven Narvaez-Romo; Jose R. Simoes-Moreira;

  • 作者单位

    Mechanical Engineering Department, Escola Politecnica, University of Sao Paulo, Sao Paulo, Brazil;

    Mechanical Engineering Department, Escola Politecnica, University of Sao Paulo, Sao Paulo, 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);
  • 原文格式 PDF
  • 正文语种 eng
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