强化吸收技术是吸收式制冷系统性能提升和应用推广的关键技术。对于降膜吸收器，减小液膜厚度、提高液膜速度和液膜表面更新率可达到强化吸收的目的。本课题以溶液管内贴壁喷射形成自由表面微尺度液膜为切入点，采用高效的氨/盐溶液为工质对，采取理论分析、数值模拟和实验研究相结合的研究方法，揭示自由表面微尺度液膜强化风冷垂直管内降膜吸收的机理。拟依次开展以下三方面的研究：(1) 溶液管内贴壁喷射形成的自由表面微尺度液膜流动特性研究；(2) 自由表面微尺度液膜吸收NH3蒸气过程的耦合传热传质特性研究；(3) 应用了自由表面微尺度液膜吸收器的风冷氨-盐吸收式制冷循环性能研究。本课题的研究结果将进一步完善自由表面微尺度液膜强化吸收的基础理论，有助于优化风冷型吸收器结构设计，并推动风冷氨/盐吸收式制冷技术的发展，具有重要的学术意义和工程应用价值。

Absorption intensification is the key technology to improve cycle performance and extend the practical application of absorption refrigeration system. Absorption intensification process taking place in a falling film absorber can be achieved by decreasing the thickness, increasing both the velocity and surface renewal rate of the absorbent liquid film. This project takes the free-surface microscale liquid film inner wall jet as a breakthrough point, using the high efficiency ammonia/salt working pair, to reveal the intensification mechanism of air cooling absorption process that taking place inside vertical tubes by theoretical, numerical and experimental methods. Analyses of the following aspects will be carried out: (1) Flow characteristics of the free-surface microscale liquid film inner wall jet; (2) Coupled heat and mass transfer characteristics of the process of free-surface microscale liquid film absorbing NH3 vapor by inner wall jet; (3) Thermal performance of an air-cooled type ammonia/salt absorption refrigeration system applying the free-surface microscale liquid film inner wall jet type absorber. Research results of the present project will perfect the theory basis of absorption process intensification technology by means of microscale absorbent liquid film, and help to optimize the design of air-cooled type absorber and promote the development of ammonia/salt absorption refrigeration technology, which is of important academic significance and engineering value.