3. Determine the rate of water evaporated from a tray full of water. Air at a...

 

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3. Determine the rate of water evaporated from a tray full of water. Air at a velocity of 2.5 m/s is flowing over the tray. The temperature of water and air is 25C. The width of the tray is 40 cm and its length along the direction of air flow is 25 cm. The diffusivity of water vapour in air is D =0.26 x 10-4 m²/s. The relative humidity of air is 50%.The vapour pressure of water at saturation is 3.179 kPa and at 50% RH is 1.5895 kPa. Molecular weight of water is 18(g/mol-¹). The kinematic viscosity of air (at 25C) is 16.14 x 10-6m²/s. The universal gas constant, R, is 8.314 m³kPa (molk). 3. Determine the rate of water evaporated from a tray full of water. Air at a velocity of 2.5 m/s is flowing over the tray. The temperature of water and air is 25C. The width of the tray is 40 cm and its length along the direction of air flow is 25 cm. The diffusivity of water vapour in air is D =0.26 x 10-4 m²/s. The relative humidity of air is 50%.The vapour pressure of water at saturation is 3.179 kPa and at 50% RH is 1.5895 kPa. Molecular weight of water is 18(g/mol-¹). The kinematic viscosity of air (at 25C) is 16.14 x 10-6m²/s. The universal gas constant, R, is 8.314 m³kPa (molk).

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To determine the rate of water evaporated from the tray we can use the concept of mass transfer and ... View the full answer