ME2121 – Engineering Thermodynamics

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SOME INTRODUCTORY COMMENTS Earlier, second law of thermodynamics and applied it to cycles and cyclic devices. Here, we apply the second law to processes. The first law of thermodynamics deals with the property energy and the conservation of it. The second law leads to the definition of a new property called entropy. Entropy is a somewhat abstract property and it is difficult to give a physical description of it without considering the microscopic state of the system. © Copyright 2005 Prof. Arun S. Mujumdar. <strong>ME2121</strong> - Entropy I - Introduction (ASM) 10
INTRODUCTION (Cont’d) We start with a discussion of the Clausius inequality, the basis for the definition of entropy. Unlike energy, entropy is a nonconserved property, and there is no such thing as a conservation of entropy principle. The entropy changes that take place during processes for pure substances, incompressible substances, and ideal gases will be discussed. Finally, entropy balance concept is introduced and applied to various systems. Examples are included at the end- some for selfstudy for lack of time during lectures. Additional examples to be included in tutorials © Copyright 2005 Prof. Arun S. Mujumdar. <strong>ME2121</strong> - Entropy I - Introduction (ASM) 11
Page 1 and 2: ME2121 - Engineering Thermodynamics
Page 3 and 4: Review Chapter 5-2 nd Law Concepts/
Page 5 and 6: Direction of Energy Conversion •
Page 7 and 8: Entropy and Disorder • The Entrop
Page 9: Entropy of Crystalline Substance Th
Page 13 and 14: Clausius Inequality (Cont’d) Clau
Page 15 and 16: Brief Review: Reversibilities etc R
Page 17 and 18: Clausius Inequality (Cont’d) To d
Page 19 and 20: Clausius Inequality (Cont’d) The
Page 21 and 22: Clausius Inequality (Cont’d) Q T
Page 23 and 24: Clausius Inequality (Cont’d) It t
Page 25 and 26: Clausius Inequality (Cont’d) Ther
Page 27 and 28: Entropy (Cont’d) The term entropy
Page 29 and 30: Entropy (Cont’d) Note that entrop
Page 31 and 32: Internally Reversible Isothermal He
Page 33 and 34: Internally Reversible Isothermal He
Page 35: Closure Study chapter 6 of textbook

ME2121 – Engineering Thermodynamics

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