Lecture Gas Mixtures b

Lecture Gas Mixtures b - 4 Evaluation of Δu and Δh...

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PROPERTIES OF GAS MIXTURES IDEAL AND REAL GASES (The relations below are exact for ideal gases and approximate for real gases) Extensive Properties – determined by addition Figure 1

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Intensive Properties – determined by weighted averaging
IDEAL GASES Assumptions: 1. High temperature and low pressure – ideal gas approximation holds 2. Gibbs-Dalton law: Properties of gas are not influenced by the presence of other gases (they behave independently at T m and V m ) 3. h, u c v and c p depend on temperature only (independent of p or v of the mixture)

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Unformatted text preview: 4. Evaluation of Δu and Δh depends only on initial and final temperature REAL GASES 1. h, u c v and c p depend on the pressure (or specific volume) and on the temperature a. We should account for the deviation from ideal gas behavior: enthalpy and entropy b. Use compressibility factors 2. Consider: dh m =T m ds m +v m dP m 3. After derivation, yields to: dh i =T m ds i +v i dP m (13-26)...
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