London: Butterworth & Co. (Publishers) Ltd , 1964. - 419 p. PREFACE In the motion of a real gas the disturbances from a uniform, equilibrium state are transmitted from place to place in the flow field as a result of encounters between the atoms and molecules of which the gas consists. It is therefore reasonable to expect that the details of the exchanges which occur in any molecular encounter will have an effect on the macroscopic behaviour of the gas. For example, we shall show that the propagation of sound waves through a gas within which chemical reactions can occur is strongly influenced by the rate at which such a reaction can proceed, and by the strength of the chemical bonds which exist, both of which properties are purely microscopic, or molecular, characteristics. In this book we shall be directly concerned with the influences of atomic and molecular structure on the dynamical behaviour of gaseous systems. This means that we shall have to deal with such hitherto widely separated topics as, for example, the wave-mechanical prediction of the energy states of a molecule and the evaluation of the gas velocity at the throat of a converging- diverging nozzle. It has not been our intention to attempt a comprehensive and up-to-date account of the latest developments under the heading of the dynamics of real gases; indeed the subject's continuing advancement would make such a task impossible. We have instead selected relevant items from the general field of study and put them together in such a way that we hope the reader will gain an understanding of the subject's background and fundamentals, and therefore be better able to understand the developments which continue to appear in the technical journals. Thus the first four chapters give brief accounts of some necessary ideas in quantum mechanics, phenomenological and statistical thermodynamics, and the theory of chemical and internal state rate processes, whilst Chapter 5 deals with the derivation of equations from which a theoretical approach to the dynamics of real gases can be begun. Chapters 6 and 7 deal, respectively, with theoretical real gas dynamics and with some of the more detailed physical processes and ideas which are involved. The choice of material for these chapters has been largely a subjective one, reflecting the authors' own interests and experience to a large extent. For this reason there are several topics which are not dealt with, or are only mentioned briefly, but which may fairly claim to be included under the general heading of real gas dynamics. In particular, we do not discuss combustion and detonation processes or flows involving phase changes; neither do we go into the question of flows which are influenced by radiation effects. Several significant developments in the latter field have taken place during the last two years, whilst the literature survey of topics discussed in this book only goes up to about the end of 1961. Some of the material is suitable for inclusion in finals year degree courses, and we hope especially that the book will prove useful to postgraduate students who are about to embark on research into one of the many facets of this field of study. J. F. Clarke M. McChesney
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