水平管降膜蒸发器是一种新型蒸发器，其传热效率高、制冷剂充注量少、设备体积小、回油性能好，应用于制冷空
调系统具有较大的前景。然而其流动和换热极为复杂，本文首先对管外制冷剂流态进行分析，建立了液膜流动模型，然后对
换热关联式进行选取，建立蒸发器的换热模型。本文最后提出了未来研究的重点，并提出了一些降膜蒸发器的思路。
关键词   降膜蒸发  液膜流动  流态  换热模型 
 
ANALYSIS ON EVAPORATION MECHANISM OF FALLING FILM
HORIZONTAL TUBE ECAPORATOR
Ma Yitai   Tian Hua
(Thermal energy research institute, Tianjin University, Tianjin 300072)
 
Abstract   Falling film horizontal tube evaporator is a new tape evaporator and it has a great prospect for its high heat
transfer efficiency, small refrigerant usage, small size of unit and good for oil return. This evaporator also has complex
flow and heat transfer, this paper firstly analyzed the refrigerant flow state and established the film flow model, then the
heat transfer model was established by choosing the heat transfer correlation. This paper also introduced the focus of
future research and some ideal to falling film horizontal tube evaporator.
Keywords   Falling film evaporating    Film flow    Flow state    Heat transfer model