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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimentally validated models for falling-film absorption around microchannel tube banks: Hydrodynamics
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Experimentally validated models for falling-film absorption around microchannel tube banks: Hydrodynamics

机译：经过实验验证的微通道管束周围降膜吸收模型：流体动力学

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摘要

Internally cooled horizontal tube banks are widely used as absorbers in thermally driven heat pumps. Recent visualization studies have revealed several flow structures such as formation, detachment, and impact of droplets, and the resulting waves and film disturbances, which can affect the liquid mixing and distribution, and consequently affect the heat and mass transfer rates. A hydrodynamic model of flow over microchannel tube banks that addresses these flow structures is presented in this paper. Droplet mode flow is modeled by considering representative primary droplets, evolving at specific droplet formation sites on each tube row. The spreading of liquid over the tube surface is modeled by considering three regions: the Feed region, the Spread region, and the Inactive region. Various droplet and film characteristics, such as droplet spacing and evolution time, film thickness and spreading, and tube wetting are also addressed. This hydrodynamic model can be coupled with a corresponding heat and mass transfer model to estimate the local absorption rates in the flow. (C) 2018 Published by Elsevier Ltd.
机译：内部冷却的水平管束被广泛用作热驱动热泵中的吸收器。最近的可视化研究已经揭示了几种流动结构，例如液滴的形成，分离和冲击，以及由此产生的波和薄膜扰动，这些扰动会影响液体的混合和分布，从而影响传热和传质速率。本文提出了解决这些流动结构的微通道管束上流动的流体动力学模型。通过考虑代表性的主要液滴，在每个管排上特定的液滴形成部位处演化，对液滴模式流动进行建模。通过考虑三个区域来建模液体在管表面上的扩散：进料区域，扩散区域和非活动区域。还讨论了各种液滴和薄膜的特性，例如液滴的间距和展开时间，薄膜的厚度和扩散以及管的润湿性。该流体动力学模型可以与相应的传热和传质模型耦合，以估计流中的局部吸收率。 （C）2018由Elsevier Ltd.发布

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