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Falling Film Evaporator

Falling Film Evaporator
Falling Film Evaporator
Product Code : 07
Product Description
Falling Film Evaporator

A falling film evaporator is an industrial device to concentrate solutions, especially with heat sensitive components. The evaporator is a special type of heat exchanger.

In general evaporation takes place inside tubes. But there are also applications were the process fluid is located on the outside tube. The process fluid to be evaporated flows as a continuous film downwards controlled by gravity. The fluid will create a film along the inner tube walls, progressing downwards (falling) - hence the name. The Fluid distributor has to be designed carefully in order to maintain an even liquid distribution for all vertical in parallel aligned tubes through which the solution falls.

In the majority of applications the heating medium is placed on the outside of the tubes. High heat transfer coefficients are required in order to achieve equally balance heat transfer resistances. Therefore most commonly condensing steam is used as a heating medium.

Separation between the liquid phase (the solution) and the gaseous phase takes place in the tubes Increasing vapour velocities downwards to the bottom of the exchanger increases the shear force acting on the liquid film and therefore also the velocity of the solution. The result can be a high film velocity and a progressively thinner film resulting in increasing turbulent flow. The combination of these effects allows very high heat transfer coefficients.

Flat no.5, Amit Aptt., Sector 13, Rohini, Delhi - 110085, India
Mr. Binit Kumar Jha (Director)
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