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首页> 外文期刊>Journal of Heat Transfer >Enhanced Condensation of Ethylene Glycol on Single Pin-Fin Tubes: Effect of Pin Geometry
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Enhanced Condensation of Ethylene Glycol on Single Pin-Fin Tubes: Effect of Pin Geometry

机译：单针翅片管上乙二醇的增强缩合：引脚几何形状的影响

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摘要

This paper presents a fundamental study into the underlying mechanisms influencing heat transfer during condensation on enhanced surfaces. New experimental data are reported for condensation of ethylene glycol at near atmospheric pressure and low velocity on 11 different 3-dimensional pin-fin tubes tested individually. Enhancements of the vapor-side, heat-transfer coefficients were found between 3 and 5.5 when compared to a plain tube at the same vapor-side temperature difference. Heat-transfer enhancement was found to be strongly dependent on the active surface area of the tubes, i.e., on the surface area of the parts of the tube and pin surface not covered by condensate retained by surface tension. For all the tubes, vapor-side, heat-transfer enhancements were found to be approximately twice the corresponding active-area enhancements. The best performing pin-fin tube gave a heat-transfer enhancement of 5.5; 17% higher than obtained from "optimised" two-dimensional fin-tubes reported in the literature and about 24% higher than the "equivalent" two-dimensional integral-fin tube (i.e., with the same fin-root diameter, longitudinal fin spacing and thickness, and fin height). The effects of surface area and surface tension induced enhancement and retention are discussed in the light of the new data and those of previous investigations.
机译：本文对影响增强表面凝结过程中传热的潜在机理进行了基础研究。据报道，在分别测试的11种不同的3维销-翅片管上，乙二醇在接近大气压和低速下的缩合反应的新实验数据。在相同的蒸气侧温度差下，与普通管相比，蒸气侧的传热系数提高了3到5.5之间。发现传热的增强很大程度上取决于管子的有效表面积，即，管子和销子表面的各部分的表面积没有被表面张力所保留的冷凝物所覆盖。对于所有管子，发现蒸气侧传热增强约为相应的有效面积增强的两倍。性能最好的针翅管的传热增强为5.5；比文献报道的“优化”二维翅片管高17％，比“等效”二维整体翅片管高24％（即，具有相同的翅根直径，纵向翅片间距）和厚度以及散热片高度）。根据新数据和以前的研究讨论了表面积和表面张力引起的增强和保留的影响。

著录项

  • 来源
    《Journal of Heat Transfer》 |2012年第1期|p.011503.1-011503.8|共8页
  • 作者

    Hafiz Muhammad Ali; Adrian Briggs;

  • 作者单位

    School of Engineering and Materials Science,Queen Mary, University of London,Mile End Road,London E1 4NS, UK;

    School of Engineering and Materials Science,Queen Mary, University of London,Mile End Road,London E1 4NS, UK;

  • 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

    heat transfer; condensation; enhancement; pin-fins;

    机译：传播热量;缩合;增强针鳍;

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