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• A falling film evaporator is a vertical tubular heat exchanger. Under gravity, the fluid flows along and down the inner wall of the tube in a thin film to achieve evaporation and heat transfer.
• A liquid distribution device is positioned in the upper channel, consisting of a liquid distribution plate and film distributor at the heat exchange tube end opening.The liquid in the tube and the hot steam outside the tube both flow downward in a co-current direction.
• Due to the short event time, the heat sensitive materials are not degraded by the high coefficients.
• It is very important for the operation and efficiency of the equipment that the tube inner surface is fully wetted with the liquid.

（1）Combined hydraulic design and structure optimisation of the liquid distribution device in the channel/the film distributor at the tube end opening.

（2）Guided flow forming model for the hydrodynamic calculation for the new film distributor at the tube end opening.

（3）Achieve design selection and optimisation of the falling film evaporator is achieved by our in-house developed non-dimensionalised correlations of the minimum liquid falling film forming flow.

（4）The enhanced heat transfer calculation model of fluted heat exchanger tubes.

（5）The thermal process calculation software and structure design technology of the new type efficient falling film evaporation equipment.

The coordinated design technology of the structure optimization and hydraulic calculation of the liquid distribution device in the tube box and the film distributor at the mouth of the heat exchanger is formed. The forming technology and the enhanced heat-transfer calculation model of longitudinal groove heat exchange tube is developed. And the thermal process calculation software and structure design technology of the new type high efficiency falling film evaporation equipment is developed.