降膜应用于各种商业和工业系统，尤其是先进的氨水热泵。本文描述了一种分析和数值工具，用于预测氨水蒸汽吸收到垂直管内液体层过程中的传热和传质。该数值模型有助于量化沿冷却垂直管的吸收过程，并为此类设备的设计考虑提供见解。物理模型基于质量、动量、能量和物种守恒。守恒方程和边界条件一起编写，表示汽液界面处的热力学平衡和温度、热量和质量通量的连续性。求解的数值方法基于所谓的有限体积法。 需要解决的传热传质问题的计算域是非均匀的，需要基于流函数归一化的坐标变换，使计算域均匀。模型的结果描述了吸收过程的行为及其对各种问题参数的依赖性。计算了温度和浓度分布，计算了热通量和质量通量，得到了传热传质系数。与之前未考虑互扩散的模型相比，本文特别考虑了互扩散对吸收率的影响。单位:双引用:研讨会论文，佐治亚州亚特兰大，2001年

Falling films are employed in a variety of commercial and industrial systems, specifically in advanced ammonia-water heat pumps. This paper describes an analytical and numerical tool developed to enable prediction of heat and mass transfer during the absorption process of ammonia-water vapor into a liquid layer falling inside a vertical tube. This numerical model can help to quantify the absorption process along the cooled vertical tube and provide insight for design considerations of such equipment. The physical model is based on conservation of mass, momentum, energy, and species. The conservation equations were written along with the boundary conditions expressing thermodynamic equilibrium and continuity of temperature, heat, and mass fluxes at the vapor-liquid interface. The numerical method for solution is based on the so-called finite volume method. The calculation domain of the heat and mass transfer problem that needs to be solved is nonuniform, which required a coordinate transformation that is based on stream function normalization, making the calculation domain uniform. The results of the model describe the behavior of the absorption process and its dependence on the various problem parameters. Temperature and concentration profiles have been calculated and the heat and mass fluxes have been evaluated, which yield heat and mass transfer coefficients. Special consideration is given to the interdiffusion to find its effect on the absorption rate as opposed to previous models that have not taken it into account.Units: Dual