Mass Transfer
Channelling is most severe

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

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Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Vapour laden gas at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and room temperature

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Mass Transfer
Heat load in a cooling tower

Both A & B
Means the amount of heat thrown away (KCal/hr.) by the cooling tower
Neither A nor B
Is equal to the number of kg, of water circulated times the cooling range

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