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Modeling analysis of moist air condensation on a plate under forced convection conditions

机译：强制对流条件下板上潮湿空气凝结的建模分析

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摘要

A modeling analysis of the filmwise condensation for water steam outside a vertical plate under forced convective conditions was carried out in this study. The latent heat and sensible heat transfer under different moist air temperature, relative humidity, velocity, and wall temperature were theoretically analyzed. The model was developed based on the conservation equations of mass, momentum, energy, diffusion, and was solved numerically by finite difference methods. Meanwhile, the presence of condensate was neglected due to the low condensation load. Firstly, the results were compared with classical correlations and showed good agreement. Then the variation of latent and sensible heat transfer changing with operation conditions, such as moist air temperature, water steam mole fraction, wall temperature, and moist air velocity, were obtained and analyzed in detail. The results indicated that the latent heat transfer coefficient increased with the increase of relative humidity, moist air temperature, velocity, and cooling wall temperature. At the same time, the sensible heat transfer coefficient remains almost constant except under different moist air velocities, and latent heat transfer coefficient accounts for more than 70.3% in all the tested conditions of this study. The results obtained in this study can give a reference for the design of heat exchangers used in moist air condensation conditions.
机译：在本研究中进行了在强迫对流条件下垂直板外旋转膜缩合的胶片缩合的建模分析。理论上分析了不同潮湿的空气温度，相对湿度，速度和壁温下的潜热和明智的热传递。该模型是基于质量，动量，能量，扩散的保护方程开发的，并且通过有限差异方法进行数字解决。同时，由于低缩合载荷，忽略了冷凝物的存在。首先，将结果与经典相关进行比较，并表现出良好的一致性。然后，获得并进行诸如潮湿的空气温度，水蒸汽摩尔分数，壁温和潮湿的空气速度的操作条件改变的潜伏和明智的传热变化并详细分析。结果表明，随着相对湿度，潮湿的空气温度，速度和冷却壁温度的增加，潜热传递系数增加。同时，除了在不同的潮湿空气速度下，明智的传热系数几乎保持恒定，并且在本研究的所有测试条件下潜在的传热系数占70.3％以上。本研究中获得的结果可以参考用于湿空气冷凝条件的热交换器的设计。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121738.1-121738.11|共11页
  • 作者

    Yu-heng Gu; Yu-dong Ding; Qiang Liao; Min Cheng; Xun Zhu; Hong Wang;

  • 作者单位

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Chongqing 400030 China Institute of Engineering Thermal Physics School of Energy and Power Engineering Chongqing University Chongqing 400030 China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Chongqing 400030 China Institute of Engineering Thermal Physics School of Energy and Power Engineering Chongqing University Chongqing 400030 China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Chongqing 400030 China Institute of Engineering Thermal Physics School of Energy and Power Engineering Chongqing University Chongqing 400030 China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Chongqing 400030 China Institute of Engineering Thermal Physics School of Energy and Power Engineering Chongqing University Chongqing 400030 China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Chongqing 400030 China Institute of Engineering Thermal Physics School of Energy and Power Engineering Chongqing University Chongqing 400030 China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Chongqing 400030 China Institute of Engineering Thermal Physics School of Energy and Power Engineering Chongqing University Chongqing 400030 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

    Moist air; Forced condensation; Latent heat; Sensible heat; Thermal resistance;

    机译：潮湿的空气;强迫凝结;潜热;显热;热阻;

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