Mass Transfer
The cooling effect in a cooling tower can be speeded up by

Reducing the humidity of the air
All of the listed here
Reducing the barometric pressure
Increasing the air velocity and area of exposed wet surface

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture
Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency

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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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