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Heat Transfer

Heat Transfer
jH factor for heat transfer is not a function of the __________ number.

Nusselt
Grashoff
Both B & C
Reynolds

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Heat Transfer
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

0.35
0.45
0.55
0.85

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Heat Transfer
Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

Flexibility possible in the baffle arrangement
High heat transfer co-efficient
Low pressure drop
Less corrosion problems

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Different
Same
Never different
Linearly related

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Heat Transfer
Double pipe heat exchangers are preferably useful, when

Requirement of heat transfer area is low
High viscosity liquid is to be cooled
Overall heat transfer co-efficient is very high
A corrosive liquid is to be heated

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr1/3
NPr-1
NPr-1/3
NPr

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