When placed correctly in a the tubes of a falling film evaporator the loops direct the falling liquid to the wall of the tube and also turbulates the film of liquid increasing heat transfer and evaporation.

The turbulators also provide additional surface area for the evaporation to take place.

Significant Improvement takes place in the falling film evaporator with the use of turbulators.

As shown in the illustration it is important to install the turbulators in the falling film evaporator with the loops sloping downwards so that the liquid flow is directed to the wall of the tubes.