Process Equipment and Plant Design
Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Triangular pitch
Heat transfer rate is independent of tube arrangement
Diagonal square pitch
Square pitch

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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
Flow at a very slow velocity
Perferably flow outside the tube
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Both B & C
Is economical in operation
Employs high velocity, high heat transfer rate and less heating surface requirement

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