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Physical Models for Convective M.T. Example (2)

Physical Models for Convective M.T. Example (2).

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Physical Models for Convective M.T. Example (2)

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  1. Physical Models for Convective M.T.Example (2) A chamber, of volume 1 m3, contains air at a temperature of 293 K and a pressure of 101.3 kN/m2, with a partial pressure of water vapor of 0.8 kN/m2. A bowl of water with a free surface of 0.01 m2 and maintained at a temperature of 303 K is introduced into the chamber. How long will it take for the air to become 90% saturated at 293 K and how much water must be evaporated? The diffusivity of water vapor in air is 2.410-5m2/s and the mass transfer resistance is equivalent to that of a stagnant gas film of thickness 0.25 mm. Neglect the effects of bulk flow. Saturation vapor pressure of water is 4.3 kN/m2 at 303 K and 2.3 kN/m2 at 293 K. How long will it take if the bowl Temperature was 293K ?

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