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.

吸收器是蒸汽吸收系统中最关键的部件，对其性能影响最大。水平管束几何形状是迄今为止最常用的吸收器几何形状，因为可实现高吸收效率而不会产生相应的压降。这些降膜吸收器的设计需要了解潜在的传热和传质机制。文献中提出的用于水平管束中吸收传热和传质的大多数模型对吸收器中的流动剖面做出了非常简单的假设。本研究中开发的瞬态二维空间模型成功地模拟了由于液滴撞击引起的薄膜混合对传热和传质的影响。与本作者在先前研究中开发的瞬态 3-D 空间模型相比，该 2-D 模型所需的计算开销要低得多。讨论了基线和参数分析的结果。还阐明了 2-D 和 3-D 模型之间的主要区别。从这项研究中获得的结果将有助于理解和设计高效的蒸汽吸收系统。