Heat Transfer
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?

Triangular pitch
None of these
Square pitch
Diagonal square pitch

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Heat Transfer
In sub-cooled boiling,

Temperature of the heating surface is more than the boiling point of the liquid
Very large vapour space is necessary
Bubbles from heating surface are absorbed by the mass of the liquid
Temperature of the heating surface is less than the boiling point of the liquid

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