FALLING FILM EVAPORATORS

Geoff Hewitt


The process of falling film evaporation is illustrated schematically in Figure 1. A liquid film falls down the channel wall and evaporates, with the vapor either flowing co-currently with the film [Figure 1 (a)] or countercurrent to it [Figure 1 (b)].

Modes of falling film evaporation
(a)

(b)

Figure 1. Modes of falling film evaporation


Falling film evaporator unit

Figure 2. Falling film evaporator unit


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