Chemical Engineering :: Heat Transfer
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The Graetz number is concerned with the
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Solid angle subtended by the finite surface at the radiating element is
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Pick out the wrong statement.
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With increase in temperature, the thermal conductivity of most liquids
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Heat transfer by __________ may not necessarily require the presence of a medium.
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Pick out the correct statement.
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In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
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The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is
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A.
The emissivity of a surface decreases, if it gets corroded by atmospheric environment.
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B.
The emissivity of a surface increases with increase in surface roughness.
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C.
The emissivity of a polished surface is quite low.
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D.
The emissivity of a non-metallic surface decreases with increase in the temperature.
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A.
Higher is the temperature of the radiating body, higher is the wavelength of radiation.
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B.
Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder.
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C.
The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature.
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D.
Solid angle subtended by the finite surface at the radiating element is called the angle of incidence.
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