Mass Transfer
Channelling is most severe

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

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Mass Transfer
Dew point of an air-water vapor mixture

Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
Decreases with decrease in pressure
All of the listed here
At constant humidity & total pressure is fixed

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