Chemical Engineering :: Mass Transfer
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The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)
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Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.
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Experimental determination of __________ is done by wetted wall column method.
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Pick out the wrong statement:
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In liquid extraction, if the selectivity is unity, then
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Which of the following has the same dimension as mass diffusivity ?
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Pick out the wrong statement pertaining to the cooling towers.
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Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is
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Leaching of coarse solid lumps is also termed as
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A.
Absorption factor is constant, when the equilibrium and operating lines are straight.
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B.
In case of a stripper, the equilibrium curve is always below the operating line.
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C.
In case of an absorber, the operating line is always above the equilibrium curve.
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D.
In the absorption of low solubility gases, the liquid film is the controlling resistance.
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A.
In case of induced draft cooling tower, the fan is placed at the top of the tower.
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B.
Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air.
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C.
A natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low.
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D.
Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature.
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