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Heat Transfer

Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Low
High
No
Extremely low

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Heat Transfer
Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.

None of these
Viscous
Elastic
Inertial

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Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

2-4 heat exchanger
1-2 heat exchanger
3-2 heat exchanger
1-1 heat exchanger

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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

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

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Heat Transfer
With increase in temperature, the thermal conductivity of most liquids

Increases
Remains same
Decreases
First increases upto a certain temperature and then becomes constant

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = 0.023 Re0.8 . Pr0.4
Nu = Gz
Nu = Gz
Nu = 2Gz0.5

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