Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Flow at a very slow velocity
Preferably flow inside the tube for its easier internal cleaning
Perferably flow outside the tube

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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

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

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