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Heat Transfer

Heat Transfer
The most conducive surface for dropwise condensation to occur is the __________ surface.

Oily
Coated
Glazed & polished
Smooth

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

5.6697 x 10-8W/m².°K4
5.6697 x 10-8kcal/m² . °K4
0.1714 x 10-8kcal/m². °K4
0.1714 x 10-8W/m².°K4

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

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Heat Transfer
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

α T⁴
Independent of T
αT
α 1/T

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Heat Transfer
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

Εx . εy
1/εx + 1/εy
Εx + εy
(εx + εy)/(εx + εy - εx . εy)

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Heat Transfer
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on?

Temperature difference between the two surfaces of the wall
Thickness of the wall
Area of the wall perpendicular to heat flow
Material of the wall

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