Radiation Heat Transfer, Augmented Edition

E. M. Sparrow

• Publisher: Routledge
• Year: 2018
• Print ISBN: 9781138473461
• eBook ISBN: 9781351420105
• Edition: 1
• Topic: Physical Sciences
• Subtopic: Thermodynamics

Revised to include more information on analytical models for wavelength independence, Radiation Heat Transfer, Augmented Edition has been rearranged, providing problems within each chapter rather than at the end of the book. Written by Ephraim M. Sparrow, a generalist who works on a very broad range of problems that encompasses almost all mechanical engineering topics, the book presents key ideas without being exhaustive. Sparrow oversees the Laboratory for Heat Transfer and Fluid Flow Practice, whose function in to undertake both industrially bases and fundamental problems that fall within the bounds of heat transfer and fluid flow.

PART ONE

THERMAL RADIATION AND RADIATION PROPERTIES

This book is concerned primarily with energy exchange by the mechanism of thermal radiation. Admittedly, a thorough understanding of the fundamental physical processes involved in radiative transfer requires a knowledge of both quantum mechanics and electromagnetic theory. However, from the viewpoint of the engineer, it is often sufficient to make use of specific results from these disciplines without pursuing the details of their derivation. This point of view is adopted in the presentation of thermal radiation and of radiation properties as set forth in Part One of this book.

Two chapters are included in Part One. The first is entitled Thermal Radiation, the second Radiation Properties of Surfaces. Inasmuch as in later parts of the book equal attention is extended to surface-to-surface radiation and to radiation in absorbing, emitting, and scattering media, it is appropriate to explain the absence of a separate chapter dealing with the radiation properties of such participating media. It is a fact that at the present time the amount of information available on the properties of participating media is less than that available on the properties of surfaces. Therefore the information on the properties of participating media has been incorporated into Chapter 1 and into several chapters of Part Three. This latter placement of material was prompted by the fact that, in some instances, a more incisive discussion of the properties is possible after the governing equations of radiative transport have been developed.

In essence, Chapter 1 contains a general exposition of the characteristics of thermal radiation, introduces the properties of surfaces, and then treats the properties of participating media in greater depth. Detailed consideration is extended to the radiation properties of surfaces in Chapter 2, including basic definitions and interrelationships, available experimental information, and results of electromagnetic theory.

CHAPTER 1

THERMAL RADIATION

As previously mentioned, this chapter will be concerned with an exposition of the essential characteristics of thermal radiation as related to both radiation exchange between surfaces and to radiation transfer through participating media. Section 1-1 describes the basic laws and definitions associated with thermal radiation and sets forth the properties of the black body. In Section 1-2 attention is directed toward the parameters that characterize surface radiation, and this section will be kept quite brief in cognizance of the more detailed discussion that is contained in Chapter 2. The final section, Section 1-3, embodies a more detailed exposition of the parameters and properties that pertain to absorbing, emitting, and scattering media.

1-1 Basic Laws and Definitions

The physics of radiation. Radiant energy may be alternatively envisioned as being transported either by electromagnetic waves or by photons. Neither point of view completely describes the nature of observed phenomena. Nevertheless, these separate concepts have considerable utility. For example, radiation properties of certain classes of surfaces may be predicted through use of electromagnetic theory, whereas quantum theory is employed in determining the properties of absorbing and emitting media.

Radiation travels at the speed of light. Thus, from the viewpoint of electromagnetic theory, the waves travel at this speed. Alternatively, from a quantum point of view, energy is transported by photons, all of which travel at the speed of light (this differs from molecular transport in that all the photons have the same speed). There is, however, a distribution of energy among the photon...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• PREFACE TO THE AUGMENTED EDITION
• PREFACE
• PART ONE THERMAL RADIATION AND RADIATION PROPERTIES
• PART TWO RADIANT INTERCHANGE AMONG SURFACES SEPARATED BY RADIATIVELY NONPARTICIPATING MEDIA
• PART THREE RADIANT ENERGY TRANSFER THROUGH ABSORBING, EMITTING, AND SCATTERING MEDIA
• APPENDIXES
• INDEXES