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Heat Transfer

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

Long tube
Agitated film
Open pan
None of these

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Heat Transfer
In a heat exchanger, floating head is provided to

facilitate cleaning of the exchanger
relieve stresses caused by thermal expansion
increase log mean temperature gradient
increase the heat transfer area

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Heat Transfer
The thermal boundary layer at NPr > 1

Disappears
And the hydrodynamic boundary layer are identical
Is thinner than hydrodynamic boundary layer
Is thicker than hydrodynamic boundary layer

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Heat Transfer
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

Stefan-Boltzman
Kirchoffs
Wien's displacement
Planck's

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

894W/m².K
287 W/m².K
333W/m².K
1200W/m².K

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Heat Transfer
Prandtl and Reynolds analogy are same, when Prandtl number is

1
0.5
> 2
1.5

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