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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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the
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If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will
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The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for
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Convective heat transfer, in which heat is transferred by movement of warmed matter is described by
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Viscosity of gases __________ with increase in temperature.
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Thermal conductivity of a gas at low density, __________ with increase in temperature.
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The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter (D) as
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Pick out the wrong statement.
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According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
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In a heat exchanger, floating head is provided to
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Heat transfer rate described by Fourier's law will decrease, if the __________ increases.
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In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.
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In forced convection, the heat transfer depends on
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The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by
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The equation, is the __________ analogy.
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The equation, is the __________ analogy.
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Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.
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In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
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Q100
Open questionThermal conductivities of most of the liquids __________ with rise in temperature.
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