Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

Fixing the tubes
Reducing scale deposition
Increasing pressure drop
Creating turbulence

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Liquid/vapor loading across the column remains constant
Trouton's rule is applicable
All of these
Sensible heat differences are small, because the temperature changes from tray to tray is small

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