Then the reversible steady flow work and the

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Unformatted text preview: , the reversible steady-flow work and the isentropic efficiencies of various engineering devices such as turbines and compressors are considered. Finally, entropy balance is introduced and applied to various systems. I 7 CONTENTS 7–1 Entropy 274 7–2 The Increase of Entropy Principle 277 7–3 Entropy Change of Pure Substances 281 7–4 Isentropic Processes 285 7–5 Property Diagrams Involving Entropy 286 7–6 What Is Entropy? 288 7–7 The T ds Relations 291 7–8 Entropy Change of Liquids and Solids 293 7–9 The Entropy Change of Ideal Gases 296 7–10 Reversible Steady-Flow Work 305 7–11 Minimizing the Compressor Work 308 7–12 Isentropic Efficiencies of Steady-Flow Devices 312 7–13 Entropy Balance 319 Summary 332 References and Suggested Readings 334 Problems 334 273 cen54261_ch07.qxd 11/18/03 9:57 AM Page 274 274 FUNDAMENTALS OF THERMAL-FLUID SCIENCES 7–1 I ENTROPY The second law of thermodynamics often leads to expressions that involve inequalities. An irreversible (i.e., actual) heat engine, for example, is less efficient than a reversible one operating between the same two t...
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