ME200 - Lecture 28 - 11/2/2010 EntropyBalance ClosedSystem...

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11/2/2010 1 Entropy Balance–Closed System ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – timothee@purdue.edu Lecture 28 November 3 rd , 2010 http://www.youtube.com/watch?v=Xp EVOPBhIo Lecture Outline Last Few Lectures: From Second Law of Thermodynamics: Some entropy must be generated or created during an irreversible process: For incompressible substances: ME 200 2 For ideal gases (last lecture): We have to distinguish between constant and variable specific heats
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11/2/2010 2 Where: k = C P /C V = Specific Heat Ratio VALID FOR: ideal gas constantspecific heats isentropicprocess ME 200 3 Entropy change and isentropic process – ideal gas; variable specific heat The entropy change for an ideal gas considering the actual dependence of C P on temperature is given by: Defining: (A 22 for air) We can derive: Then: ME 200 4 &:
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11/2/2010 3 • Correct unit error on Example 26.2 • Finish Example 27.1 • Study entropy balance for closed system •S o l v e one example with a closed system Today •O n Friday: •M o s t l y examples with open systems a y include a competition like example • Next week ME 200 5 • Next week: •L e c t u r e s on Monday and Wednesday will be taught by Daniel Richardson as I will be in Aberdeen, MD for a project review.
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue University-West Lafayette.

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ME200 - Lecture 28 - 11/2/2010 EntropyBalance ClosedSystem...

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