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Heat Transfer 1


Ledoux, Michel / El Hami, Abdelkhalak


1. Auflage Mai 2021
352 Seiten, Hardcover
Wiley & Sons Ltd

ISBN: 978-1-78630-516-9
John Wiley & Sons

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Heat is a branch of thermodynamics that occupies a unique position due to its involvement in the field of practice. Being linked to the management, transport and exchange of energy in thermal form, it impacts all aspects of human life and activity.

Heat transfers are, by nature, classified as conduction, convection (which inserts conduction into fluid mechanics) and radiation. The importance of these three transfer methods has resulted ? justifiably ? in a separate volume being afforded to each of them. This first volume is dedicated to thermal conduction, and, importantly, assumes an analytical approach to the problems presented, and recalls the fundamentals. Heat Transfer 1 combines a basic approach with a deeper understanding of the discipline and will therefore appeal to a wide audience, from technician to engineer, from doctoral student to teacher-researcher.

Preface ix

Introduction xiii

Chapter 1. The Problem of Thermal Conduction: General Comments 1

1.1. The fundamental problem of thermal conduction 1

1.2. Definitions 2

1.2.1. Temperature, isothermal surface and gradient 2

1.2.2. Flow and density of flow 4

1.3. Relation to thermodynamics 5

1.3.1. Calorimetry 5

1.3.2. The first principle 6

1.3.3. The second principle 6

Chapter 2. The Physics of Conduction 9

2.1. Introduction 9

2.2. Fourier's law 9

2.2.1. Experiment 9

2.2.2. Temperature profile 12

2.2.3. General expression of the Fourier law 14

2.3. Heat equation 16

2.3.1. General problem 16

2.3.2. Mono-dimensional plane problem 18

2.3.3. Case of the axisymmetric system 24

2.3.4. Case of the spherical system 25

2.4. Resolution of a problem 26

2.5. Examples of application 29

2.5.1. Problems involving spherical symmetry 40

Chapter 3. Conduction in a Stationary Regime 53

3.1. Thermal resistance 53

3.1.1. Thermal resistance: plane geometry 53

3.1.2. Thermal resistance: axisymmetric geometry. The case of a cylindrical wall 62

3.1.3. Thermal resistance to convection 65

3.1.4. Critical radius 67

3.2. Examples of the application of thermal resistance in plane geometry 69

3.3. Examples of the application of the thermal resistance in cylindrical geometry 85

3.4. Problem of the critical diameter 92

3.5. Problem with the heat balance 99

Chapter 4. Quasi-stationary Model 103

4.1. We can perform a simplified calculation, adopting the following hypotheses 103

4.2. Method: instantaneous thermal balance 104

4.3. Resolution 106

4.4. Applications for plane systems 107

4.5. Applications for axisymmetric systems 152

Chapter 5. Non-stationary Conduction 183

5.1. Single-dimensional problem 183

5.1.1. Temperature imposed at the interface at instant t = 0 184

5.2. Non-stationary conduction with constant flow density 190

5.3. Temperature imposed on the wall: sinusoidal variation 193

5.4. Problem with two walls stuck together 200

5.5. Application examples 204

5.5.1. Simple applications 204

5.5.2. Some scenes from daily life 213

Chapter 6. Fin Theory: Notions and Examples 237

6.1. Notions regarding the theory of fins 237

6.1.1. Principle of fins 237

6.1.2. Elementary fin theory 238

6.1.3. Parallelepiped fin 242

6.2. Examples of application 249

Appendices 263

Appendix 1. Heat Equation of a Three-dimensional System 265

Appendix 2. Heat Equation: Writing in the Main Coordinate Systems 273

Appendix 3. One-dimensional Heat Equation 283

Appendix 4. Conduction of the Heat in a Non-stationary Regime: Solutions to Classic Problems 291

Appendix 5. Table of erf (x), erfc (x) and ierfc (x) Functions 295

Appendix 6. Complementary Information Regarding Fins 297

Appendix 7. The Laplace Transform 301

Appendix 8. Reminders Regarding Hyperbolic Functions 309

References 313

Index 315
Michel Ledoux was Professor and Vice-President at the University of Rouen, France. He was also Director of the UMR CNRS CORIA, then Regional Delegate for Research and Technology in Upper Normandy, France. Specializing in fluid mechanics and transfers, he has worked in the fields of reactive boundary layers and spraying. Currently retired, he is an adviser to the Conservatoire National des Arts et Metiers in Normandy, collaborating with the Institute of Industrial Engineering Techniques (ITII) in Vernon, France.

Abdelkhalak El Hami is Full Professor of Universities at INSA-RouenNormandie, France. He is the author/co-author of several books and is responsible for the Chair of mechanics at the Conservatoire National des Arts et Metiers in Normandy, as well as for several European pedagogical projects. He is a specialist in problems of optimization and reliability in multi-physical systems.