建立了描述叉流式降膜蒸发过程的理论模型 ,预测结果与实验基本相符。在分析和探讨蒸发器传热传质规律过程中 ,发现根据入口水温的不同 ,蒸发器可分别用于蒸发冷却和海水淡化。从蒸发冷却和加热蒸发两个角度讨论了气流、水流及蒸发器结构参数对系统性能的影响 ,为蒸发器的优化设计奠定了基础 A theoretical model describing the process of cross-flow falling film evaporation was established. The predicted results are in good agreement with the experimental results. In analyzing and discussing the heat and mass transfer law of the evaporator, it is found that the evaporator can be used for evaporative cooling and desalination respectively according to the inlet water temperature. The effects of gas flow, water flow and evaporator structure parameters on the system performance are discussed from two aspects of evaporative cooling and heating evaporation, which lays the foundation for the optimal design of the evaporator