13 Chemical NonEquilibrium

Otherwise in reverse direction no2 must just come

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Unformatted text preview: rvation of e nergy and momentum. Otherwise in reverse direction NO2 must just come apart, which is not possible 2 NO d NO dt ? moles/cm3/sec • Elementary reaction rates (detailed mechanism) O2 N2 N O N2 M NNM M OOM NO NO OM NO2 M N 2O O NOM NO M O2 O NO N2 N NO contain many intermediate species, often unstable radicals Chemical Nonequilibrium -2 Copyright © 2010 by Jerry M. Seitzman. All rights reserved. AE6050 1 School of Aerospace Engineering Reaction Rate • General elementary reaction n i1 • Reaction rate (RR) • Example d M i dt N N O d NO dt RR i1 RR NO i Mi i v_left = 2 v_right = 1 for N RR v_left = 1 v_right = 0 for O Chemical Nonequilibrium -3 i N RR 1 2 d N dt n Mi i AE6050 Copyright © 2010 by Jerry M. Seitzman. All rights reserved. School of Aerospace Engineering Reaction Rate Constant • From kinetic theory (or empiricial evidence), reaction rate should be proportional to amount of each reactant n n RR k Mi i i i1 i Mi i1 i Mi • Proportionality factor – reaction rate constant, k • Example N RR Chemical Nonequilibrium -4 Copyright © 2010 by J...
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