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A well-mixed open pond contains wastewater that is contaminated with a dilute concentration of dissolved methylene chloride.a
The pool is rectangular with dimensions of 500 m by 100 m. Air 27°C at and 1.0 atm blows parallel to the surface of the pond as shown in the figure with a velocity of 7.5 m/s. At 20°C and 1.0 atm, the diffusion coefficient of methylene chloride in air DAB 0:085 cm2/s and the kinematic viscosity of the air nB = 0:15 cm2/s.
(a) At what position across the pond is the air no longer laminar?
(b) Determine the mean gas-film mass-transfer coefficient associated with the transfer of methylene chloride.
(c) What is the Schmidt number for methylene cholride in the liquid phase if at 20°C the diffusion coefficient of methylene chloride in water is 1:07 × 10-5 cm2/s and the kinematic viscosity of water is 0.010 cm2 /s?
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