Abstract: Owing to high heat and mass transfer coefficient，large gas-liquid contact area and quick surface renewal，the falling liquid film flows on vertical structure can be used in chemical and polymerization reaction engineering. Experimental investigation，theoretical analysis and numerical simulation of falling liquid film flows on vertical structure are reviewed. The application of falling liquid film of low viscosity fluid in chemical engineering and falling film of high viscosity fluid used in polymerization reaction are introduced respectively. The falling liquid film flows of low viscosity fluid are more intensely investigated，while the study on high viscosity fluid only concerns film formation. The paper proposes the possible trends of falling liquid film. Falling liquid film flows of high viscosity fluid on vertical structure which involves the transfer of heat and mass coupled with chemical reaction will be the focus of future research.

Key words: falling liquid film, flow instability, heat transfer, mass transfer, polymerization, reaction engineering

摘要： 竖直元件上的降液膜流动由于具有传热传质系数高、气液接触面积大和表面更新速度快等优点，因而在化工和聚合反应工程上有着广泛应用。本文综述了竖直降膜元件上液膜流动的实验研究、理论分析和数值模拟，分别介绍了低黏流体降液膜流动在气体吸收与化学反应等方面的应用和高黏流体降液膜流动在涂覆与聚合物脱挥等聚合物加工中的应用情况。总结表明，目前对于低黏流体在竖直元件上的降液膜流动研究已较为成熟，而高黏流体降液膜流动的大部分研究仅着重于其成膜性能上。最后分析了降液膜流动的研究趋势，指出涉及热质传递与化学反应耦合的高黏流体在竖直结构上的降液膜流动是今后的重点研究对象。

关键词: 降液膜, 流动不稳定性, 传热, 传质, 聚合, 反应工程