Thermodynamics filled in class notes_Part_136

# Thermodynamics filled in class notes_Part_136 - rium mass...

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7.2. ADIABATIC, ISOCHORIC KINETICS 279 10 -10 10 -5 10 0 10 -15 10 -10 10 -5 10 0 t (s) H O H 2 O 2 OH H 2 O H 2 O 2 HO 2 N 2 c i Figure 7.15: Plot of c H 2 ( t ), c H ( t ), c O ( t ), c O 2 ( t ), c OH ( t ), c H 2 O ( t ), c HO 2 ( t ), c H 2 O 2 ( t ), c N 2 ( t ), for adiabatic, isochoric combustion of a mixture of 2 H 2 + O 2 +3 . 76 N 2 initially at T o = 1542 . 7 K , P o = 2 . 8323 × 10 6 Pa . 10 -10 10 -5 0 500 1000 1500 2000 2500 3000 3500 4000 t (s) T (K) Figure 7.16: Plot of T ( t ), for adiabatic, isochoric combustion of a mixture of 2 H 2 + O 2 +3 . 76 N 2 initially at T o = 1542 . 7 K , P o = 2 . 8323 × 10 6 Pa . CC BY-NC-ND. 18 November 2011, J. M. Powers.

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280 CHAPTER 7. KINETICS IN SOME MORE DETAIL 10 -10 10 -5 10 6 10 7 t (s) P (Pa) Figure 7.17: Plot of P ( t ), for adiabatic, isochoric combustion of a mixture of 2 H 2 + O 2 + 3 . 76 N 2 initially at T o = 1542 . 7 K , P o = 2 . 8323 × 10 6 Pa . de±nition 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 ±nds t ind = 6 . 6 × 10 7 s. (7.362) A close-up view of the species concentration pro±les is given in Fig. 7.18. At the end of the induction zone, there is a ±nal relaxation to equilibrium. The equilib-
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Unformatted text preview: rium mass fractions of each species are c O 2 = 1 . 85 × 10 − 2 , (7.363) c H = 5 . 41 × 10 − 4 , (7.364) c OH = 2 . 45 × 10 − 2 , (7.365) c O = 3 . 88 × 10 − 3 , (7.366) c H 2 = 3 . 75 × 10 − 3 , (7.367) c H 2 O = 2 . 04 × 10 − 1 , (7.368) c HO 2 = 6 . 84 × 10 − 5 , (7.369) c H 2 O 2 = 1 . 04 × 10 − 5 , (7.370) c N 2 = 7 . 45 × 10 − 1 . (7.371) We note that because our model takes N 2 to be inert that its value remains unchanged. Other than N 2 , the ±nal products are dominated by H 2 O . The equilibrium temperature is 3382 . 3 K and 5 . 53 × 10 6 Pa. CC BY-NC-ND. 18 November 2011, J. M. Powers....
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Thermodynamics filled in class notes_Part_136 - rium mass...

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