Lec30 - ME 200: Thermodynamics I Lecture 30: Entropy...

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ME 200: Thermodynamics I Lecture 30: Entropy increase principle, open system entropy balance Sections 6.8-6.10.1 Problems: SP30; 6.82, 6.88 Professor Hukam Mongia Office Hours: MWF 2:30 to 3:30 pm in ME 83 (Other times email for appointment) Email: hmongia@purdue.edu Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200 Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) See Kul Inn (ME 189) about grading Homework Assignments 1
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Directionality of Processes Increase of Entropy Principle for Isolated Closed Systems 1 st Law: D E] isol = 0 D E] system + D E] surr =0 2 nd Law: ≥0 Increase in entropy principal is just another definition of the 2 nd Law 2
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Example 6.5 Quenching a hot metal bar T equl , s? Equilibrium temperature : D U + D KE + D PE = Q-W T f = 535 o R s = D S] water + D S] metal = 0.0864 Btu/ o R 3
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When an isolated system is allowed enough time to interact with its subsystems that there is no more change in its characteristics including properties,
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This note was uploaded on 05/01/2011 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University-West Lafayette.

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Lec30 - ME 200: Thermodynamics I Lecture 30: Entropy...

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