Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

All of these
Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes
Presence of a non-condensible gas decreases the condensing film co-efficient
Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

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Heat Transfer
Nusselt number is the ratio of the

Temperature difference to the temperature gradient at the wall
Heat flux at the wall to that across the entire pipe
Temperature gradient of the wall to that across the entire pipe
None of these

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