Heat Transfer
Nusselt number is the ratio of the

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

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

Heat sensitive material can be handled
Equal heat transfer co-efficients exist in various effects
There is no additional cost of pumping
Most concentrated liquid is at highest temperature

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