Thermodynamics filled in class notes_Part_128

Thermodynamics filled in class notes_Part_128 - 7.1...

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Unformatted text preview: 7.1. ISOTHERMAL, ISOCHORIC KINETICS 263 LBracket1 NO RBracket1 LBracket1 N RBracket1 10 Minus 8 10 Minus 6 10 Minus 4 0.01 1 100 t LParen1 s RParen1 10 Minus 16 10 Minus 14 10 Minus 12 10 Minus 10 10 Minus 8 LBracket1 N RBracket1 , LBracket1 NO RBracket1 LParen1 mole Slash1 cc RParen1 Figure 7.11: ρ NO and ρ N versus time for Zel’dovich mechanism at T = 1500 K , P = 6 . 2355 × 10 3 dyne/cm 2 . the high pressure P = 6 . 2355 × 10 5 dyne/cm 2 , T = 1500 K case, we notice some similarities and dramatic differences. The overall shape of the time-profiles of concentration variation is similar. But, we see the reaction commences at a much later time, t ∼ 10 − 6 s . For t ∼ 10 − 4 s , there is a temporary cessation of significant reaction. We notice a long plateau in which species concentrations do not change over several decades of time. This is again actually a pseudo-equilibrium. Significant reaction recommences for t ∼ 10 s . Only around t ∼ 100 s does the system approach final equilibrium. We can perform an eigenvalue analysisdoes the system approach final equilibrium....
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Thermodynamics filled in class notes_Part_128 - 7.1...

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