HEAT TRANSFER

Provides authoritative coverage of the fundamentals of heat transfer, written by one of the most cited authors in all of Engineering

Heat Transfer presents the fundamentals of the generation, use, conversion, and exchange of heat between physical systems. A pioneer in establishing heat transfer as a pillar of the modern thermal sciences, Professor Adrian Bejan presents the fundamental concepts and problem-solving methods of the discipline, predicts the evolution of heat transfer configurations, the principles of thermodynamics, and more.

Building upon his classic 1993 book Heat Transfer, the author maintains his straightforward scientific approach to teaching essential developments such as Fourier conduction, fins, boundary layer theory, duct flow, scale analysis, and the structure of turbulence. In this new volume, Bejan explores topics and research developments that have emerged during the past decade, including the designing of convective flow and heat and mass transfer, the crucial relationship between configuration and performance, and new populations of configurations such as tapered ducts, plates with multi-scale features, and dendritic fins. Heat Transfer: Evolution, Design and Performance:

* Covers thermodynamics principles and establishes performance and evolution as fundamental concepts in thermal sciences

* Demonstrates how principles of physics predict a future with economies of scale, multi-scale design, vascularization, and hierarchical distribution of many small features

* Explores new work on conduction architecture, convection with nanofluids, boiling and condensation on designed surfaces, and resonance of natural circulation in enclosures

* Includes numerous examples, problems with solutions, and access to a companion website

Heat Transfer: Evolution, Design and Performance is essential reading for undergraduate and graduate students in mechanical and chemical engineering, and for all engineers, physicists, biologists, and earth scientists.

Adrian Bejan is J. A. Jones Distinguished Professor in the Department of Mechanical Engineering andMaterials Science at Duke University, USA. His main areas of research are thermodynamics, heat transfer,fluid mechanics, and design evolution in nature. He is the author of 30 books and 700 peer-refereed journalarticles and is an Honorary Member of the American Society of Mechanical Engineers (ASME).

Provides authoritative coverage of the fundamentals of heat transfer, written by one of the most cited authors in all of Engineering

Heat Transfer presents the fundamentals of the generation, use, conversion, and exchange of heat between physical systems. A pioneer in establishing heat transfer as a pillar of the modern thermal sciences, Professor Adrian Bejan presents the fundamental concepts and problem-solving methods of the discipline, predicts the evolution of heat transfer configurations, the principles of thermodynamics, and more.

Building upon his classic 1993 book Heat Transfer, the author maintains his straightforward scientific approach to teaching essential developments such as Fourier conduction, fins, boundary layer theory, duct flow, scale analysis, and the structure of turbulence. In this new volume, Bejan explores topics and research developments that have emerged during the past decade, including the designing of convective flow and heat and mass transfer, the crucial relationship between configuration and performance, and new populations of configurations such as tapered ducts, plates with multi-scale features, and dendritic fins. Heat Transfer: Evolution, Design and Performance:

• Covers thermodynamics principles and establishes performance and evolution as fundamental concepts in thermal sciences
• Demonstrates how principles of physics predict a future with economies of scale, multi-scale design, vascularization, and hierarchical distribution of many small features
• Explores new work on conduction architecture, convection with nanofluids, boiling and condensation on designed surfaces, and resonance of natural circulation in enclosures
• Includes numerous examples, problems with solutions, and access to a companion website

Heat Transfer: Evolution, Design and Performance is essential reading for undergraduate and graduate students in mechanical and chemical engineering, and for all engineers, physicists, biologists, and earth scientists.

Inhalt

List of Symbols xvii

1 INTRODUCTION

1.1 Fundamental Concepts

1.1.1 Heat Transfer

1.1.2 Temperature

1.1.3 Specific Heats

1.2 The Objective of Heat Transfer

1.3 Conduction

1.3.1 The Fourier Law

1.3.2 Thermal Conductivity

1.3.3 Cartesian Coordinates

1.3.4. Cylindrical Coordinates

1.3.5 Spherical Coordinates

1.3.6 Initial and Boundary Conditions

1.4 Convection

1.5 Radiation

1.6 Performance

1.6.1 Irreversible heating

1.6.2 Reversible heating

References

Problems

2 UNIDIRECTIONAL STEADY CONDUCTION

2.1 Thin Walls

2.1.1 Thermal Resistance

2.1.2 Composite Walls

2.1.3 Overall Heat Transfer Coefficient

2.2 Cylindrical Shells

2.3 Spherical Shells

2.4 Critical Insulation Radius

2.5 Variable Thermal Conductivity

2.6Internal Heat Generation

2.7 Performance: Extended Surfaces (Fins)

2.7.1 The Enhancement of Heat Transfer

2.7.2 Constant Cross-Sectional Area

2.7.3 Variable Cross-Sectional Area

2.7.4 Scale Analysis: When the Unidirectional Conduction Model is Valid

2.7.5 Fin Shape Subject to Volume Constraint

2.7.6 Heat Tube Shape

References

Problems

3 MULTIDIRECTIONAL STEADY CONDUCTION

3.1 Analytical Solutions

3.1.1 Two-Dimensional Conduction in Cartesian Coordinates

3.1.2 Heat Flux Boundary Conditions

3.1.3 Superposition of Solutions

3.1.4 Cylindrical Coordinates

3.1.5 Three-Dimensional Conduction

3.2 Integral Method

3.3 The Method of Scale Analysis

3.4 Performance

3.4.1 Shape Factors

3.4.2 Trees: Volume-Point Flow

References

Problems

4 TIME-DEPENDENT CONDUCTION

4.1 Immersion Cooling or Heating

4.2 Lumped Capacitance Model (the Late Regime)

4.3 Semi-infinite Solid Model (the Early Regime)

4.3.1 Constant Surface Temperature

4.3.2 Constant Heat Flux Surface

4.3.3 Surface in Contact with Fluid Flow

4.4 Unidirectional Conduction

4.4.1 Plate

4.4.2 Cylinder

4.4.3 Sphere

4.4.4 Plate, Cylinder, and Sphere with Fixed Surface Temperature

4.5 Multidirectional Conduction

4.6 Concentrated Sources and Sinks

4.6.1 Instantaneous (One-Shot) Sources and Sinks

4.6.2 Persistent (Continuous) Sources and Sinks

4.6.3 Moving Heat Sources

4.7 Melting and Solidification

4.8 Performance

4.8.1 Spacings between Buried Heat Sources

4.8.2 The S-curve Growth of Spreading and Collecting

References

Problems

5 EXTERNAL FORCED CONVECTION

5.1 Classification of Convection Configurations

5.2 Basic Principles of Convection

5.2.1 Mass Conservation Equation

5.2.2 Momentum Equations

5.2.3 Energy Equation

5.3 Laminar Boundary Layer

5.3.1 Velocity Boundary Layer

5.3.2 Thermal Boundary Layer (Isothermal Wall)

5.3.3 Nonisothermal Wall

5.3.4 Film Temperature

5.4 Turbulent Boundary Layer

5.4.1 Transition from Laminar to Turbulent Flow

5.4.2 Time-Averaged …