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首页> 外文期刊>International Journal of Heat and Mass Transfer >Stability analysis and maldistribution control of two-phase flow in parallel evaporating channels
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Stability analysis and maldistribution control of two-phase flow in parallel evaporating channels

机译：平行蒸发通道内两相流的稳定性分析及分布不均控制

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摘要

Parallel channel heat transfer system is an attractive means to enhance heat transfer by increasing the total surface area in the heat exchanger. Uniform distribution of flow in the channels is an important operation attribute in order to avoid channel dryout and the subsequent hot spots and possible device failure. For the system operating in the single-phase regime, uniform flow distribution is a stable equilibrium. However, in the two-phase boiling regime, stable equilibrium bifurcates - the uniform distribution becomes unstable, and new stable or unstable non-uniform distributions, or maldistributions, equilibria emerge. As a result, parallel channel heat exchangers typically operate in the single phase regime to avoid such "maldistribution instability". This paper presents a stability analysis and active flow and temperature control of a parallel channel evaporator in a pumped two-phase boiling heat transfer loop. We show that for identical channels, the system is uncontrollable with the pump alone and unobservable from the overall flow rate measurement. A conventional solution involves introducing additional valve-induced pressure drop, but the drawback is a resulting higher pumping power. We present a new, somewhat surprising, result that if the channel characteristics are all distinct, the system actually becomes controllable from the pump and observable from the total loop flow rate. For non-identical parallel systems, we show a controller design approach and demonstrate its efficacy through a simulation example.
机译：平行通道传热系统是一种有吸引力的方法，可通过增加热交换器的总表面积来增强传热。通道中流量的均匀分布是一项重要的操作属性，以避免通道变干和随后出现的热点以及可能的设备故障。对于在单相状态下运行的系统，均匀的流量分布是稳定的平衡。但是，在两相沸腾状态下，稳定的平衡分叉-均匀分布变得不稳定，并且出现了新的稳定或不稳定的非均匀分布或分布不均的平衡点。结果，平行通道热交换器通常在单相状态下操作以避免这种“分布不稳定性”。本文介绍了抽水两相沸腾换热回路中平行通道蒸发器的稳定性分析以及主动流动和温度控制。我们表明，对于相同的通道，仅使用泵无法控制该系统，并且无法从整体流量测量中观察到该系统。传统的解决方案涉及引入附加的阀引起的压降，但是缺点是导致更高的泵送功率。我们提出了一个新的，令人有些惊讶的结果，即如果通道特性都不同，则该系统实际上变得可以由泵控制，并且可以从总回路流量观察到。对于非相同的并行系统，我们展示了一种控制器设计方法，并通过一个仿真示例证明了其有效性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第26期|p.5298-5305|共8页
  • 作者

    Tiejun Zhang; John T. Wen; Agung Julius; Yoav Peles; Michael K. Jensen;

  • 作者单位

    Center for Automation Technologies and Systems, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA,Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA;

    Center for Automation Technologies and Systems, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA,Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA,Department of Electrical, Computer & System Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA;

    Department of Electrical, Computer & System Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA;

    Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA;

    Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA;

  • 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

    flow instability; flow distribution; multiple evaporators; parallel channel; two-phase flow;

    机译：流量不稳定;流量分配;多个蒸发器;平行通道;两相流;

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