Lecture27_Entropy for ideal gas-handout

Lecture27_Entropy for ideal gas-handout - ME200 :...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : ebae@purdue.edu Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 27 : Entropy change for ideal gas
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2 Outline Entropy for ideal gas Examples
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3 Entropy change of ideal gas - For ideal gas, starting from - On integrating (Cv and Cp are function of T) °± = °? ? + ²°? ? °± = °ℎ ? + ?°² ? - ± 2 − ± 1 = · ³ ? ¸ ¹ ¸ º °? ? − µ ln ² 2 ² 1
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4 Entropy change of ideal gas - Using ideal gas tables and when the change of the entropy is of interest, we can define - Where T R is an arbitrary reference temperature, therefore ° ± ? = ² ³ ´ µ ? ¶? µ µ · ° 2 − ° 1 = ² ³ ´ ? µ ¸ µ ¹ ¶? ? − ? ln º 2 º 1 ² ³ ´ ? µ ¸ µ ¹ ¶? ? = ² ³ ´ ? µ ¸ µ » ¶? ? − ² ³ ´ ? µ ¹ µ » ¶? ? T S
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5 Entropy change of ideal gas - Therefore ° 2 − ° 1 = ± ² ³ ? ´ µ ´ ·? ? + ? ln ¸ 2 ¸ 1 = - For per mole basis
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6 Entropy change of ideal gas - Given s2-s1 ° ± − ° ² = ³ ´ µ ?
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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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Lecture27_Entropy for ideal gas-handout - ME200 :...

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