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Heat Transfer

Heat Transfer
Mechanical recompression evaporation is used in the production of

Salt
Fruits jam
Alcohol
Distilled water

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Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf could be greater or smaller than hd
hf < hd
hf > hd
hf = hd

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Heat Transfer
Economy of a multiple effect evaporator depends upon the

Neither A nor B
Heat balance consideration
Both A and B
Rate of heat transfer

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Heat Transfer
Pick out the correct equation.

JH = (St)2/3(Pr) = f/2
JH = (St)1/3(Pr) = f/2
JH = (St)(Pr)1/3 = f/2
JH = (St)(Pr)2/3 = f/2

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Heat Transfer
In a cooling tower, water becomes cool by

Heat transfer to surroundings
Vaporisation due to heat loss to air
Loosing latent heat
Loosing sensible heat

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Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

2
10
100
0.5

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