Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Neither A nor B
Approach is 10°F
Both A & B
Range is 15°F

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Mass Transfer
Channelling is most severe

In towers packed with stacked packing
In towers packed randomly with crushed solids
In dumped packing of regular units
At very high liquid flow rate

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