Heat Transfer
Which of the following is unimportant in forced convection ?

Reynolds number
Grashhoff number
Prandtl number
none of the listed here

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

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

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