Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

All of these
Operating pressure and column diameter
Type & size of packing
Fluid rates and fluid properties

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

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

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