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Heat Transfer

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

0.5
100
2
10

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

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Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

< 0.1
> 0.6
0.5
< 0.5

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Heat Transfer
Calburn analogy is applicable for the value of Prandtl number from

0.001 to 1
0.6 to 120
120 to 400
0.5 to 5

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Heat Transfer
The purpose of providing expansion bellows in the shell of tubular exchanger is to

Increase the heating load
Account for the uneven expansion of shell and tube bundles
Facilitate increase of shell length, if needed
Impart structural strength

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

32
50
37
45

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