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首页> 外文期刊>International Journal of Heat and Mass Transfer >A 2-D numerical analysis of heat and mass transfer in lithium bromide-water falling films and droplets
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A 2-D numerical analysis of heat and mass transfer in lithium bromide-water falling films and droplets

机译：锂溴水 - 水落薄膜和液滴中热量传质的二维数值分析

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摘要

The absorber is the most crucial component of the vapor absorption system and has the largest impact on its performance. The horizontal tube bank geometry is by far the most commonly used absorber geometry, due to the high absorption efficiencies achievable without incurring commensurate pressure drops. The design of these falling film absorbers requires an understanding of the underlying heat and mass transfer mechanisms. A majority of the models proposed in the literature for absorption heat and mass transfer in horizontal tube banks make very simplistic assumptions about the flow profiles in the absorber. The effects on heat and mass transfer due to the mixing in the film caused by droplet impact are successfully modeled by the transient, 2-D spatial model developed in the present study. This 2-D model requires a significantly lower computational overhead compared to the transient, 3-D spatial model developed by the present authors in a previous study. The results from the baseline and parametric analyses are discussed. The key differences between the 2-D and 3-D models are also elucidated. The results obtained from this study will aid in the understanding and design of efficient vapor absorption systems.
机译：吸收器是蒸汽吸收系统最重要的成分，对其性能的影响最大。由于在没有产生的相应压力下降的情况下，水平管库几何形状是迄今为止最常用的吸收性几何形状。这些下降膜吸收剂的设计需要了解潜在的热量和传质机制。在水平管库中吸收热量和质量传递的文献中提出的大多数模型对吸收器中的流动谱进行了非常简单的假设。由于本研究中开发的瞬态，2-D型空间模型成功地建模了由液滴冲击引起的膜中的混合引起的热量和质量传递的影响。与前一项研究中的本作者开发的瞬态3-D空间模型相比，该2-D模型需要显着较低的计算开销。讨论了基线和参数分析的结果。 2-D和3-D模型之间的关键差异也阐明。本研究获得的结果将有助于理解和设计高效的蒸汽吸收系统。

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