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Heat and Mass Transfer

Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Conduction
Convection
Radiation
Conduction and convection

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Heat and Mass Transfer
The emissivity for a black body is

0.75
1
0.5

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa - pv
Pb = pa/pv
Pb = pa × pv
Pb = pa + pv

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Heat and Mass Transfer
Total heat is the heat required to

Change liquid into vapour
Convert water into steam and superheat it
Increase the temperature of a liquid or vapour
Change vapour into liquid

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Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Depends upon the shape of body
Same
Higher
Lower

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

-1
=-2/3
1
=-1/3

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