Falling Film Evaporator


A falling film evaporators are used to concentrate solutions, especially with heat sensitive components. The liquid product usually enters the evaporator at the head of the evaporator. The product is evenly distributed into the heating tubes in such a way as to flow down the inside of the tube walls as a thin film. The liquid film starts to boil due to the external heating of the heating tubes and is partially evaporated as a result. The downward flow, caused initially by gravity, is enhanced by the parallel, downward flow of the vapor formed. This gravity-induced downward movement is increasingly augmented by the co-current vapor flow. The separation of the concentrated product from its vapor happens in the lower part of the heat exchanger and the separator.


  • Simple in operation
  • Suitable for heat sensitive products
  • Requires lower circulation rates
  • Liquid distributor is designed in such that way that equally distribution of liquid in tubes.


  • Food Industry – Milk, Coffee, Soy Milk, Apple Juice, Tea Extract etc
  • Chemical Industry
  • Dye Intermediates
  • Distillery waste water effluent with low TSS


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