ME300Lecture12

# ME300Lecture12 - Lecture 12 Ideal Gas Mixtures Goal Develop...

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12.1 Lecture 12: Ideal Gas Mixtures Goal: » Develop rules for evaluating the properties of gas mixtures using the properties of single components. Assumptions: » Each gas in the mixture behaves like an ideal gas. The overall mixtures behaves like an ideal gas. » Gases in the mixture do not react with each other. Applications: » A typical application is the evaluation of exhaust gases of a combustion process. Consider: n moles of components 1, 2, …, k @ T, p, V CM

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12.2 Composition of Ideal Gas Mixtures Mixture Properties: k m 1 2 k i i1 k th i ii m k m 1 2 k i k th i m i i i (single c Total mass of the mixture : m m m ... m m m Mass fraction of i component : x x 1 m Total number of moles : n n n ... n n n Mole fraction of i component : y y 1 n m Molar mass : M n m m m m 1 1 2 2 k k m m omponent) (mixture) m M n m n M n M ... n M n M
12.3 Composition Analysis of Air 1.0 Constituent Mole Fraction Molar mass Mass per mole of mixture Mass fraction O 2 N 2 Ar 28.96 air air kg kmol 2 2 32.0 O O kg kmol 2 0.232 O air kg kg 2 0.21 O air kmol kmol 2 6.72 O air kg kmol 2 2 28.01 N N kmol 2 0.756 N air kg kg 2 0.781 N air 2 21.88 N

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ME300Lecture12 - Lecture 12 Ideal Gas Mixtures Goal Develop...

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