Thermodynamics filled in class notes_Part_108

Thermodynamics filled in class notes_Part_108 - . After a...

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6.4. ADIABATIC, ISOCHORIC KINETICS 223 This problem requires a detailed numerical solution. Such a solution was performed by solving Eq. (6.14) along with the associated calorically imperfect species state equations for a mixture of eighteen interacting species: H 2 , H , O , O 2 , OH , H 2 O , HO 2 , H 2 O 2 , N , NH 2 , NH 3 , N 2 H , NO , NO 2 , N 2 O , HNO , and N 2 . The equilibrium values were reported in a previous example. The dynamics of the reaction process are reFected in ±ig. 6.2. At early time, t < 4 × 10 4 s , the pressure, temperature, and major reactant species concentrations ( H 2 , O 2 , N 2 ) are nearly constant. However, the minor species, e.g. OH , NO , HO 2 and the major product, H 2 O , are undergoing very rapid growth, albeit concentrations whose value remains small. In this period, the material is in what is known as the induction period
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Unformatted text preview: . After a certain critical mass of minor species has accumulated, exothermic recombination of these minor species to form the major product H 2 O induces the temperature to rise, which accelerates further the reaction rates. This is manifested in a thermal explosion . A common de²nition of the end of the induction period is the induction time , t = t ind , the time when dT/dt goes through a maximum. Here one ²nds t ind = 4 . 53 × 10 − 4 s. (6.158) At the end of the induction zone, there is a ²nal relaxation to equilibrium. CC BY-NC-ND. 18 November 2011, J. M. Powers. 224 CHAPTER 6. THERMOCHEMISTRY OF MULTIPLE REACTIONS CC BY-NC-ND. 18 November 2011, J. M. Powers....
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This note was uploaded on 11/26/2011 for the course EGN 3381 taught by Professor Park-sou during the Fall '11 term at FSU.

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Thermodynamics filled in class notes_Part_108 - . After a...

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