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首页> 外文期刊>International Journal of Heat and Mass Transfer >Simulation of evaporation and sublimation process in porous plate water sublimator based on a reduced CFD model
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Simulation of evaporation and sublimation process in porous plate water sublimator based on a reduced CFD model

机译：基于降低CFD模型的多孔板水升华器蒸发和升华过程的仿真

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摘要

Water sublimator is an ideal high-efficiency heat rejection device working in the vacuum environment with a high thermal load. The ideal working condition for the water sublimator is the sublimation in a porous plate. In this study, the process of evaporation, freezing and sublimation in a porous plate are investigated numerically and experimentally. The mass transfer of the feedwater in the porous plate involves the theory of the rarefied gas flow in micro-channels. In order to establish a reduced CFD model in conjunction with the mathematical model, a dynamic heat transfer boundary is defined and a user-defined function (UDF) is prepared in the ANSYS Fluent software. Temperature and position of the evaporation/sublimation front, which significantly affects the heat dissipation of the sublimator is considered in the simulations. Furthermore, the thermal properties of the liquid water and ice are considered to simulate the different thermal conductive performance and freezing processes. In order to validate the simulation, a porous plate water sublimator is tested in a vacuum chamber. It is found that the simulation results are in an excellent agreement with the experiment. The present study focuses on the process before the cold surface reaches the low-temperature peak of 258 K from 283 K. Accordingly, it is found that the physical process before the cold surface reaches the low-temperature peak of 283 K. Based on the verified model, flows with different feedwater mass flow rates and heating fluxes in the porous plate are simulated. Obtained results show that an inappropriate matching of the water supply and the heating flux prevents the feedwater to enter the sublimation state in the porous plate. Moreover, it is concluded that the proposed CFD method simplifies the problem reasonably and significantly reduces the computational expenses.
机译：水升华器是一种理想的高效散热装置，在真空环境中工作，具有高热载荷。水升华器的理想工作条件是多孔板中的升华。在该研究中，在数值和实验上研究了多孔板中蒸发，冷冻和升华过程。多孔板中给水的传质涉及微通道中稀土气流的理论。为了与数学模型结合建立还原的CFD模型，定义了动态传热边界，并在ANSYS流畅的软件中准备了用户定义的函数（UDF）。在模拟中考虑了蒸发/升华前部的温度和位置，这显着地影响了升华器的散热。此外，认为液态水和冰的热性质被认为模拟不同的导热性能和冷冻过程。为了验证模拟，在真空室中测试多孔板水升华器。结果发现，仿真结果与实验一致。本研究专注于冷表面达到258 k的低温峰值，因此，发现冷表面之前的物理过程达到283k的低温峰值。验证模型，采用不同的给水质量流量和多孔板中的加热通量流动。得到的结果表明，供水和加热通量的不当匹配可以防止给水在多孔板中进入升华状态。此外，得出结论是，所提出的CFD方法合理简化了问题，并显着降低了计算开支。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第6期|119787.1-119787.12|共12页
  • 作者

    Chen Zhang; Xueqin Bu; Jiang He; Chang Liu; Guiping Lin; Jianyin Miao;

  • 作者单位

    Laboratory of Fundamental Science on Ergonomics and Environmental Control School of Aeronautic Science and Engineering Beihang University Beijing 100191 PR China;

    Laboratory of Fundamental Science on Ergonomics and Environmental Control School of Aeronautic Science and Engineering Beihang University Beijing 100191 PR China;

    Beijing Key Laboratory of Space Thermal Control Technology Institute of Spacecraft System Engineering China Academy of Space Technology Beijing 100094 PR China;

    Beijing Key Laboratory of Space Thermal Control Technology Institute of Spacecraft System Engineering China Academy of Space Technology Beijing 100094 PR China;

    Laboratory of Fundamental Science on Ergonomics and Environmental Control School of Aeronautic Science and Engineering Beihang University Beijing 100191 PR China;

    Beijing Key Laboratory of Space Thermal Control Technology Institute of Spacecraft System Engineering China Academy of Space Technology Beijing 100094 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

    Sublimator; Evaporation; Sublimation; Heat and mass transfer; CFD method;

    机译：升华器;蒸发;升华;热量和传质;CFD方法;

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