Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Reduce liquid hold up
Minimise the overall pressure drop
Avoid flooding
Avoid channeling

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Water has a high latent heat of evaporation
Lewis number is close to unity
Solubility of the components of air in water is very small
They are always equal under all circumstances

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