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Heat Transfer

Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Agitated film
Open pan
Long tube
None of these

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Heat Transfer
Reynold's analogy states that

Nst α NRe
Nst α f
NRe α f
NNu α f

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Heat Transfer
Harmonic mean temperature difference is given by

2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
√(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)

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Heat Transfer
Film boiling is usually not desired in commercial equipments, because

the heat transfer rate is low in view of the large temperature drop. @
it is not economic
it is difficult to maintain
none of the listed here

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Heat Transfer
In which mode of heat transfer, the Biot number is important?

Transient heat conduction
Radiation
Natural convection
Forced convection

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Heat Transfer
Double pipe heat exchangers are used

because it is less costly
when heat transfer area required is very high
because it occupies less floor area
when heat transfer area required is very low

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