Heat Transfer
The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Prandtl number
Schmidt number
Nusselt number
Heat flux

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Heat Transfer
In a shell and tube heat exchanger,

There is no relationship between temperature drop and resistance
The temperature drop is inversely proportional to the resistance across which the drop occurs
The temperature drops in the two fluids and the wall are proportional to individual resistances
The relationship is not generalised

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