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mass transfer Estimate the value of the mass transfer coefficient in a stream of air at 350K flowing in a duct past the following shapes

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Estimate the value of the mass transfer coefficient in a stream of air at 350K flowing in a duct past the following shapes made of solid naphthalene. The velocity of air is 3m/s at 370K and 200 kPa. The DAB of naphthalene in air is 7106m2/s at 298K and 101.3kPa for air flowing past a single sphere with 30mm in diameter

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