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首页> 外文期刊>International Journal of Heat and Mass Transfer >Development of liquid-air mass transfer correlations for liquid desiccant dehumidification considering the liquid/air contact and film instability
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Development of liquid-air mass transfer correlations for liquid desiccant dehumidification considering the liquid/air contact and film instability

机译：考虑液体/空气接触和膜的不稳定性，开发用于液体干燥剂除湿的液体-空气传质相关性

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摘要

The focus of this work is on the liquid-air mass transfer mechanism that is critical for liquid desiccant dehumidification and many other absorption processes. Most existing mass transfer correlations heavily rely on specific experiments and show poor universality. Therefore, we proposed a new set of mass transfer correlations theoretically based on the film instability during falling film dehumidification. The flow dynamic, Marangoni effect and liquid/air contact conditions that affecting the interface characteristics and wetting factors are considered. The correlations were verified by comparing with experimental data from several widely-cited literatures. The tests in these literatures were conducted under a wide range of operating conditions and dehumidifier types. The newly-developed correlations provide an acceptable prediction for liquid-air mass transfer, showing close trends to all previous experimental results. The overall error of the new predictions, 20-30%, is close to those of empirical equations built in the specific literature. The factors that affect the interphase mass transfer by changing the film instability and the wetting factor are also analyzed. The increase in liquid Reynolds number shows the most significant effect as it could effectively increase the film instability and liquid-air contact area. The liquid contact angle on solid surfaces, regarding the wettability, also affects the mass transfer considerably. By reducing the contact angle from 90 degrees to 10 degrees, although the increase in Sherwood number is slight due to the suppression of film instability, the wetting factor is almost doubled, resulting in a significant growth in mass transfer performance. This new correlation examines the falling film mass transfer process in more detail, and is based on fewer simplifying assumptions and attempts to take more realistic situations into account. Findings presented herein contribute to a more fully understanding on the falling film behaviors during liquid/gas contact such as liquid desiccant dehumidification. (C) 2019 Elsevier Ltd. All rights reserved.
机译：这项工作的重点是液体-空气质量传递机制，这对于液体干燥剂的除湿和许多其他吸收过程至关重要。现有的大多数传质相关性都严重依赖特定的实验，并且显示出较差的通用性。因此，我们基于降膜除湿过程中的膜不稳定性理论上提出了一套新的传质相关性。考虑了影响界面特性和润湿因子的流动动力学，Marangoni效应和液体/空气接触条件。通过与来自一些被广泛引用的文献的实验数据进行比较，验证了相关性。这些文献中的测试是在广泛的运行条件和除湿机类型下进行的。新开发的相关性为液-气传质提供了可接受的预测，与所有先前的实验结果都显示出接近的趋势。新预测的整体误差为20％至30％，与特定文献中建立的经验方程式的误差接近。还分析了通过改变膜的不稳定性和润湿因子影响相间传质的因素。液体雷诺数的增加显示出最显着的效果，因为它可以有效地增加膜的不稳定性和液-气接触面积。关于润湿性，固体表面上的液体接触角也会显着影响传质。通过将接触角从90度减小到10度，尽管由于抑制了膜的不稳定性，舍伍德数的增加很小，但润湿因子几乎增加了一倍，导致传质性能显着提高。这种新的关联更详细地检查了降膜传质过程，它基于较少的简化假设，并尝试考虑更多实际情况。本文提出的发现有助于更充分地了解在液体/气体接触（例如液体干燥剂除湿）过程中的降膜性能。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2019年第10期|491-502|共12页
  • 作者

    Qi Ronghui; Dong Chuanshuai; Zhang Li-Zhi;

  • 作者单位

    South China Univ Technol, Sch Chem & Chem Engn, Educ Minist, Key Lab Enhanced Heat Transfer & Energy Conservat, Guangzhou, Guangdong, Peoples R China;

    South China Univ Technol, Sch Chem & Chem Engn, Educ Minist, Key Lab Enhanced Heat Transfer & Energy Conservat, Guangzhou, Guangdong, Peoples R China;

    South China Univ Technol, Sch Chem & Chem Engn, Educ Minist, Key Lab Enhanced Heat Transfer & Energy Conservat, Guangzhou, Guangdong, Peoples R China|South China Univ Technol, State Key Lab Subtrop Bldg Sci, Guangzhou, Guangdong, Peoples R 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

    Liquid desiccant dehumidification; Interphase mass transfer; Interface instability; Falling film; Mass transfer correlations;

    机译：液体干燥剂除湿;间传质;界面不稳定性;落叶薄膜;传质相关;

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