Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

laminar
highly turbulent
None of the listed here
transition

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Heat Transfer
A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system
Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
Total heat transfer area of all the effects is -less than that in a single effect evaporator system
Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect

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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
There is no additional cost of pumping
Most concentrated liquid is at highest temperature
Heat sensitive material can be handled

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