Q381
Open questionA 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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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Q382
Open questionA metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m3 and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m2.K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is
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Q383
Open questionA concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
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Q384
Open questionRemoval of __________ heat is involved in the condensation of a vapor under saturated conditions.
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Q385
Open questionA hot body will radiate heat most rapidly, if its surface is
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Q386
Open questionMaximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
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Q387
Open questionAt what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?
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Q388
Open questionPeclet number (Pe) is given by
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Q389
Open questionPick out the correct equation.
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Q390
Open questionKirchoff s law applies to __________ radiation.
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Q391
Open questionThe purpose of providing bleed points in the evaporator is to
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Q392
Open questionWhich of the following is unimportant in forced convection?
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Q393
Open questionDuhring rule is important in solving problems on
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Q394
Open questionFourier's law of heat conduction applies to __________ surfaces.
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Q395
Open questionFourier's law applies to the heat transfer by
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Q396
Open questionPrandtl number is the ratio of
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Q397
Open questionPick out the wrong statement.
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Q398
Open questionWater is normally used as a coolant in the heat exchange equipments mainly because ofits
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Q399
Open questionThe overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is
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Q400
Open questionForced circulation evaporators are normally used for concentrating liquids having
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