Chemical Engineering :: Heat Transfer
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In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.
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A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
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In forced convection, the Nusselt number is a function of
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At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?
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A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because
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Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by
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Trap is used to remove __________ from steam pipe lines.
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A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is
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Tube pitch is the __________ of tube diameters and the clearances.
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With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer
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A.
total heat transfer area of all the effects is -less than that in a single effect evaporator system.
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B.
total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect.
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C.
boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system.
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D.
heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system.
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