5310 Combustion Introduction Lecture 5

5310 Combustion Introduction Lecture 5 - MAE 5310...

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MAE 5310: COMBUSTION FUNDAMENTALS Lecture 5: Chemical Equilibrium September 8, 2011 Mechanical and Aerospace Engineering Department Florida Institute of Technology D. R. Kirk
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2 nd LAW OF THERMODYNAMICS: GIBBS FREE ENERGY To arrive at equilibrium relations, employ 2 nd Law of Thermodynamics State 2 nd Law in terms of Gibbs Free Energy, G=H-TS For a closed system at constant T and P, the Gibbs free energy is minimum at thermodynamic equilibrium irrev irrev irrev TdS VdP SdT dG TdS VdP dH TdS VdP dH Q dS T Q dS - + - = + - = - = + = δ 0 , , , , = = - = - = i P T i i i P T i i irrev n T n P dn n G dn n G TdS P G V T G S i i Basic Thermodynamic Relations Criteria for Equilibrium
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MORE USEFUL FORMS G i =H i -TS i Separate G i into a pressure dependent and term and pressure independent term Recall that Cp i is not a function of pressure The more negative Gº is, the larger K p is and the more spontaneous the reaction is
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5310 Combustion Introduction Lecture 5 - MAE 5310...

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