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HEAT TRANSFER

Heat Transfer
Unsteady state heat conduction occurs, when

Temperature distribution is dependent on time
Temperature distribution is independent of time
Heat flows in one direction only
Three dimensional heat flow is concerned

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

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

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Heat Transfer
In the free convection regime of pool boiling, the heat flux is proportional to

Δt2
Δt5/4
Δt1/2
Δt

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Heat Transfer
The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Ha = 0.8hL
Ha = 2hL
Ha= 5hL
Ha = hL

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

> 2
0.5
1.5
1

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