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The merits of using falling film evaporators are as follows:  These types of evaporators have very high heat transfer coefficients ranging from 2000-5000 W/m(square) for water and 500 to 1000 for organic liquids  The residence times are short in case of heated surfaces, 5-10 seconds without recirculation  They have very low pressure drops, 0.2-0.5 kN/m(square) ,  These evaporators are well suited for vacuum operations as well.  The evaporation ratios are very high. 70 per cent without and 95 per cent with recirculation,  They have a very wide operating range, they can provide as much as 400% of the minimum throughput, In addition to the above advantages they have a low cost of operation and are less susceptible to fouling.
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The advantages of using falling film evaporators are as follows:  These types of evaporators have very high heat transfer coefficients ranging from 2000-5000 W/m(square) for water and 500 to 1000 for organic liquids  The residence times are short in case of heated surfaces, 5-10 seconds without recirculation  They have very low pressure drops, 0.2-0.5 kN/m(square) ,  These evaporators are well suited for vacuum operations as well.  The evaporation ratios are very high. 70 per cent without and 95 per cent with recirculation,  They have a very wide operating range, they can provide as much as 400% of the minimum throughput, In addition to the above advantages they have a low cost of operation and are less susceptible to fouling
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Falling film evaporator is generally used in Pharmaceutical industry for making cough syrups. This basically used when the initial solution is highly viscos.

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