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An experimental and analytical (simulation) study on two-phase loop thermosyphons: Very small to very large systems.

机译：关于两相环路热虹吸管的实验和分析（模拟）研究：非常小到非常大的系统。

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摘要

An experimental and analytical (numerical) study was carried out on the fluid flow, heat transfer and instabilities for five (5) small, medium and large scale two-phase loop thermosyphons. The five two-phase closed loop thermosyphons (TLTs) specially designed and constructed for the present study are one small scale loop (SSL: 5.4 mm ID & 1.2 m x 0.5 m; 150 W), two medium scale loops (MSL I: 0.095 mm ID & 0.423 m in width; 60 W and MSL II: 0.0202 m ID & 3 m x 2 m; 1,500 W) and two large scale loops (LSL I: 0.0202 m ID & 1.8 m x 2 m; 7,500 W and LSI II: 0.0202 m ID & 2.208 m x 10 m; 100,000 W).; Experimentally, various parameters which would affect the operation of a TLT such as the total system temperature difference, saturation temperature of the working fluid in the system, coolant velocity over the condenser section, coolant temperature, the size of the condenser section, the amount of a working fluid in the system, the choice of working fluids, pressure drop, effectiveness and instability were investigated.; Two simulation methods based on thermal resistance net work, lumped and sectorial, are presented. In the simplified model called here as the Lumped method, the evaporator section is dealt as one lumped boiling section, i.e., one empirical equation for a forced convective boiling. However, this model could not simulate the TLTs adequately because of its simplistic approach to cover all the heat transfer modes of the different flow regimes involved in the system by one equation.; In the Sectorial method, all possible phenomena which would occur in the evaporator section due to the two-phase boiling process are considered in detail. Flow regimes (bubbly, slug, churn, annular and annular mist etc.), the flow transition between flow regimes and other two-phase parameters involved in two-phase flows are carefully analyzed. The results of two different simulation methods are compared with experimental results and the limitation of the computer simulation for such two-phase heat transfer systems as the TTLs studied is critically discussed.; To complement the simulation study for five different scale of TTLs, an analysis was also made on the instability of the SSL as a separate study. (Abstract shortened by UMI.)
机译：对五（5）个小型，中型和大型两相回路热虹吸管的流体流动，传热和不稳定性进行了实验和分析（数值）研究。为本研究特别设计和构造的五个两相闭环热虹吸管（TLT）是一个小规模的环路（SSL：5.4 mm ID和1.2 mx 0.5 m; 150 W），两个中等规模的环路（MSL I：0.095 mm） ID＆宽度0.423 m; 60 W和MSL II：0.0202 m ID＆3 mx 2 m; 1,500 W）和两个大型环路（LSL I：0.0202 m ID＆1.8 mx 2 m; 7,500 W and LSI II：0.0202 m ID和2.208 mx 10 m; 100,000 W）;在实验上，会影响TLT操作的各种参数，例如总系统温度差，系统中工作流体的饱和温度，冷凝器部分的冷却剂速度，冷却剂温度，冷凝器部分的大小，系统中的工作流体，研究了工作流体的选择，压降，有效性和不稳定性。提出了两种基于热阻网络的仿真方法，集总和扇形。在这里称为集总法的简化模型中，蒸发器部分被视为一个集总沸腾部分，即一个强制对流沸腾的经验方程式。但是，由于该模型采用一种方程式来涵盖系统中涉及的不同流态的所有传热模式的简化方法，因此无法充分模拟TLT。在扇形方法中，详细考虑了由于两相沸腾过程而在蒸发器部分中发生的所有可能现象。仔细分析了流动状态（气泡状，团状，搅动状，环形和环形雾状等），流动状态之间的流动过渡以及涉及两相流动的其他两相参数。将两种不同的模拟方法的结果与实验结果进行了比较，并严格讨论了诸如TTLs这样的两相传热系统的计算机模拟的局限性。为了补充针对五个不同规模的TTL的仿真研究，还对SSL的不稳定性进行了单独分析。 （摘要由UMI缩短。）

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  • 作者

    Rhi, Seok-Ho.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 485 p.
  • 总页数 485
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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