EXAMIANS
In a gas-liquid shell and tube heat exchanger, the
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Grashhoff number is given by
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Among liquids, water has a comparatively high value of thermal conductivity, due to its
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Maximum heat transfer rate is obtained in __________ flow.
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The unit of heat transfer co-efficient in SI unit is
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Value of Prandtl number for water ranges from
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The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
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A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is
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The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.
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A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be
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