The Rising Film Evaporator is designed by using a vertical tube with steam condensing on its outside surface. Liquid on the inside of the tube is brought to a boil, the vapour generated forming a core in the centre of the tube. As the fluid moves up the tube, more vapour is formed resulting in a higher central core velocity that forces the remaining liquid to the tube wall. Higher vapour velocities in turn result in thinner and more rapidly moving liquid film. This provides higher HTC’s and shorter product residence time.

Preferably used for the evaporation of highly viscous products and products that have a tendency to foul the heating surface. Can also operate as high concentrators with single-pass operation.

Plant Selection Criteria