MulticomponentDiffusionEPLect12ME525Sp2011

MulticomponentDiffusionEPLect12ME525Sp2011 - 1 Example...

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1 Example Problem Multicomponent Diffusion Lecture 12 ME 525 SP2011 Prof. Lucht The table below lists flame properties calculated using the CHEMKIN PREMIX code for a burner-stabilized H 2 -air flame. The flame temperature (K) and the mole fractions of H 2 , O 2 , H 2 O, and N 2 are listed as a function of distance z (in cm) from the burner surface. The mole fractions of all other species in the flame gases total less than 1% and can be neglected in calculating MW mix . The pressure of 1 atm is uniform throughout the flowfield. Assume that the multi-component diffusion coefficient D i,mix for a species i in the mixture is approximately equal to the binary diffusion coefficient for species i and N 2 , D i,N2 . Use the Chapman-Enskog formula and the Lennard-Jones parameters, both given in the equation sheets, to calculate the binary diffusion coefficients. The atomic hydrogen (H) mole fraction profile and the polynomial fit to the data are shown in the plot on the next page.
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MulticomponentDiffusionEPLect12ME525Sp2011 - 1 Example...

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