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The imagination is stricken by the substantial conceptual identity between the problems met in the  theoretical study of physical phenomena. It is absolutely unexpected and surprising, whether one  studies equilibrium statistical mechanics, or quantum field theory, or solid state physics, or celestial mechanics, harmonic analysis, elasticity, general relativity or fluid mechanics and chaos in turbulence. The  analysis  is preceded  by a long discussion  of the phenomenological aspects concerning the  fluid equations and their properties  with particular attention to  the  meaning  of the various approximations.

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The book was originally written by Professor John Roberson, with Professor Clayton Crowe adding the material on compressible flow. Professor Roberson retired from active authorship after the 6th edition, Professor Donald Elger joined on the 7th edition, and Professor Barbara Williams joined on the 9th edition. Professor Crowe retired from active authorship after the 9th edition. This l0th edition was developed by Professors Elger and Williams with Professor Crowe reviewing chapters for technical accuracy. Professor Crowe passed away on February 5, 2012. He was active on the book until a few weeks before his death and will be missed by his co-authors.

The chapters are organized to lay out the knowledge for students. Each chapter begins with statements of what is important to learn. These learning outcomes are formulated in terms of what Students will be able to do. Then, the sections present the knowledge. Last. the knowledge is summarized at the end of each chapter.

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This textbook is the translation of the fourth edition of Strömungslehre, Einführung in die Theorie der Strömungen. The German edition has met with a favorable reception in German-speaking countries, showing that there was a demand for a book that emphazises the fundamentals. In the English literature there are books of the same nature, some excellent, and these have indeed influenced me to write this book. However, they cover different ground and are not aimed primarily at mechanical engineering students, which this book is. I have kept the original concept throughout all editions and there is little to say that has not been said in the preface to the first German edition. There is now a companion volume Solved Problems in Fluid Mechanics, which alleviates the drawback of the first German edition, namely the absence of problem exercises.
The book has been translated by Katherine Mayes during her stay in Darmstadt, and I had the opportunity to work with her daily. It is for this reason that I am solely responsible for this edition, too. The first English edition was the translation of the fourth German edition. In the meantime the textbook has undergone several additions, mostly stimulated by consulting activities of the first author. Since the textbook continues to receive favourable reception in German speaking countries and has been translated in other languages as well, the publisher suggested a second English edition.
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This book is intended to accompany a text used in that first course in fluid mechanics which is required in all mechanical engineering and civil engineering departments, as well as several other departments. It provides a succinct presentation of the material so that the students more easily understand those difficult parts. If an expanded presentation is not a necessity, this book can be used as the primary text. We have included all derivations and numerous applications, so it can be used with no supplemental material. A solutions manual is available from the authors at MerleCP@sbcglobal.net.

We have included a derivation of the Navier – Stokes equations with several solved flows. It is not necessary, however, to include them if the elemental approach is selected. Either method can be used to study laminar flow in pipes, channels, between rotating cylinders, and in laminar boundary layer flow. The basic principles upon which a study of fluid mechanics is based are illustrated with numerous examples, solved problems, and supplemental problems which allow students to develop their problem-solving skills. The answers to all supplemental problems are included at the end of each chapter. All examples and problems are presented using SI metric units. English units are indicated throughout and are included in the Appendix.

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