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Numerical investigation on critical heat flux and coolant volume required for transpiration cooling with phase change

机译：相变蒸发冷却所需临界热通量和冷却剂体积的数值研究

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摘要

The mechanism of transpiration cooling with liquid phase change is numerically investigated to protect the thermal structure exposed to extremely high heat flux. According to the results of theoretical analysis, there is a lower critical and an upper critical external heat flux corresponding a certain coolant mass flow rate, between the two critical values, the phase change of liquid coolant occurs within porous structure. A strongly applicable self-edit program is developed to solve the states of fluid flow and heat transfer probably occurring during the phase change procedure. The distributions of temperature and saturation in these states are presented. The variations of the thickness of two-phase region and the pressure including capillary are analyzed, and capillary pressure is found to be the main factor causing pressure change. From the relationships between the external heat flux and coolant mass flow rate obtained at different cooling cases, an approach is given to estimate the maximal heat flux afforded and the minimal coolant consumption required by the desired case of transpiration cooling. Thus the pressure and coolant consumption required in a certain thermal circumstance can be determined, which are important in the practical application of transpiration cooling.
机译：数值研究了随着液相变化蒸发蒸腾的机理，以保护暴露于极高热通量下的热结构。根据理论分析的结果，在两个临界值之间存在一个较低的临界和一个较高的外部热通量，对应于一定的冷却剂质量流量，在多孔结构内会发生液体冷却剂的相变。开发了一种适用性强的自编辑程序，以解决可能在相变过程中发生的流体流动和传热状态。给出了这些状态下温度和饱和度的分布。分析了两相区域的厚度和包括毛细管在内的压力变化，发现毛细管压力是引起压力变化的主要因素。根据在不同冷却情况下获得的外部热通量与冷却剂质量流量之间的关系，给出了一种方法来估算所需的蒸腾冷却情况下提供的最大热通量和所需的最小冷却剂消耗量。因此，可以确定在一定热环境下所需的压力和冷却剂消耗，这在蒸腾冷却的实际应用中很重要。

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  • 来源
    《Energy Conversion & Management》 |2014年第4期|591-597|共7页
  • 作者

    Fei He; Jianhua Wang;

  • 作者单位

    Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Jinzhai Road 96, Hefei 230027, PR China;

    Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Jinzhai Road 96, Hefei 230027, 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

    Critical heat flux; Pressure; Transpiration cooling; Phase change; Porous media;

    机译：临界热通量;压力;蒸腾冷却;相变多孔介质;

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