Mass Transfer
Channelling is most severe

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

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And humidified
And dehumidified with increase in wet bulb temperature
And dehumidified with decrease in wet bulb temperature
At the same relative humidity

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