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ME405_Lecture_13

# ME405_Lecture_13 - 3(steady-state mass concentration of CH...

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ME 405 Fall 2006 Professor John M. Cimbala Lecture 13 10/04/2006 Today, we will : Do another example problem using flux chambers Discuss empirical equations for emission rates in Section 4.2 Do some example problems Discuss evaporation and diffusion in Section 4.5 Example Given : Methane (CH 4 ) is emitted from a 3 m × 1 m manure tank in a barn. A flux chamber is built on top of the tank to measure the emission rate. The following quantities are measured: Note : We drop the subscript j since there is only one species of concern. c a = 0.0020 mg/m 3 (ambient mass concentration of CH 4 in the barn) Q a = 0.018 m 3 /s (bulk air flow rate into the flux chamber) c ss = 0.15 mg/m

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