Chemical Engineering :: Heat Transfer
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A __________ evaporator employs an annular downtake.
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Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
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In natural convection heat transfer, the correlating parameter is the
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Boiling of milk in an open vessel is an example of __________ boiling.
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Pick out the wrong statement.
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Mode of heat transfer involved in the cooling of air cooled internal combustion engine is
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Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that
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The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in °C is
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In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the
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To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is
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A.
In process heat exchangers, saturated steam is preferred over the superheated steam.
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B.
The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1.
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C.
When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum.
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D.
A body at 925 K emits an energy of 1.42 x 1011σW/m2 (σ is the Stefan-Boltzman constant) in the wavelength band between 3 μm to 4 μm. The fraction of this energy in the total energy emitted over the entire wavelength range is equal to emissivity.
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