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Heat Transfer

Heat Transfer
The equation, Nst = f/2, is the __________ analogy.

Reynolds
Prandtl
Colburn
None of these

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

37
45
32
50

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Heat Transfer
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

Low pressure
Nucleate
Pool
None of these

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Coated
Smooth
Oily
Glazed

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Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

1
18
26
7

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Heat Transfer
The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Nusselt number
Prandtl number
Schmidt number
Heat flux

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