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Are these statements about the distillateto concentrate ratio in evaporators true? Statement 1: Lack of wall wetting causes fouling. Statement 2: Fouling depends on the fluid velocity.

Are these statements about the distillateto concentrate ratio in evaporators true? Statement 1: Lack of wall wetting causes fouling. Statement 2: Fouling depends on the fluid velocity. Correct Answer True, True

Enough liquid should be passing through the evaporator to keep the heated walls wet. Lack of wall wetting and fluid velocity may cause serious fouling and salting of solids on the heat transfer surfaces, leading to degradation of product quality. In processes where high distillate-to-concentrate ratios are required, recycling of concentrate is done.

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