lecture27

lecture27 - Prof.Naik 2011 ME 200: Thermodynamics I Lecture...

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1 Prof.Naik © 2011 Lecture 27: Entropy Change for Ideal Gases Last Lecture T-ds relationships Prof.Naik © 2011 Entropy change for incompressible substances du Pdv ds TT  dh vdP ds  2 2 1 1 () ln constant specific heat T du CdT C T ds s dT C T T    
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2 This Lecture Entropy Change for Ideal Gases Prof.Naik © 2011 Entropy Change: Ideal Gases Recall T-ds relationships Pd d dP dh Prof.Naik © 2011 For an ideal gas, we have » T Pdv T du ds T vdP T ds » »
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3 Entropy Change: Ideal Gases (contd.) Entropy change for an ideal gas: Prof.Naik © 2011 Use known dependence of C v and C p on temperature and integrate (accurate but tedious) Use constant C v and C p if temperature change is small Use ideal gas property tables Entropy Change: Ideal Gases (contd.) Define: 2 T Prof.Naik © 2011 Entropy change for an ideal gas considering the actual dependence of C p on temperature is given by:  00 0 21 1 () ref pp T dT dT sT CT s s TT  
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4 Example Prof.Naik © 2011 Air enters a nozzle steadily at 280 kPa and 77
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lecture27 - Prof.Naik 2011 ME 200: Thermodynamics I Lecture...

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