Question

Release of ammonia from animal waste is an air pollution problem that is being studied in a lab- scale experiment. The experiment uses a small tank of liquid manure that is 28 cm long and 18 cm wide. Bulk air (with negligible ammonia) is being blown over the upper surface of the tank (along its length) with a velocity of 0.1 m/s. The exposed surface of the liquid manure can be modeled as a flat plate. Assume the temperature of both the liquid surface and the air is 20°C. The diffusion coefficient of ammonia in air at 20°C is 0.22 x 10 m/s. a) If the ammonia concentration in the liquid manure is 25 mg/L, what is the ammonia concentration in the air just above the liquid surface? (13.7 mg/m) b) Calculate the convection mass transfer coefficient. (0.002 m/s) (try both methods - directly finding hm or first finding h and then using the Chilton-Coburn analogy to find hm) c) Calculate the rate at which ammonia is lost from the liquid surface. (0.0014 mg/s)

Answer 1

Answer:

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Explanation:

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