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Heat Transfer

Heat Transfer
Prandtl number for most of dry gases is about

70
0.001
150
0.72

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Heat Transfer
For what value of Prandtl number, St = f/2?

2
1
> 1
1.5

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

50 -100 BTU/hr. ft.2°F
50 -100 W/m² . °K
50 -100 Kcal/hr.m².°C
1000 - 1500 BTU/hr. ft.2°F

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit-fluid temperature > wall temperature
Exit fluid temperature < wall temperature
Exit fluid temperature = wall temperature
Graetz number > 100

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Heat Transfer
The driving potential for the crystal growth during crystallisation is the __________ of the solution.

Super-saturation
Viscosity
Concentration
Density

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Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

Increasing the tube length
None of these
Enhancing the fluid pumping rate
Keeping the heat transfer surface clean

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