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Résumé :
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The book is divided into four main parts.The first part contains two introductory chapters in which the fundamentals of boundary-layer theory are expounded without the use of mathematics and then proceeds to prepare the mathematical and physical justification for the theory of laminar boundary layers,and includes the theory of thermal boundary layers.The third part is concerned with the phenomenon of transition from laminar to turbulent flow (origin of turbulence),and the fourth part is devoted to turbulent flows.It is now possible to take the view that the theory of laminar boundary layers is complete in its main outline.The physical relations have been completely clarified;the methods of calculation have been largely worked out and have,in many cases,been simplified to such an extent that they should present no difficulties to engineers.In discussing turbulent flows use has been made essentially only of the semi-empirical theories which derive from Prandt's mixing length.It is true that according to present views these theories possess a number of shortcomings but nothing superior has so far been devised to take their place,nothing,that is,which is usefull to the engineer.No account of the statistical theories of turbulence has been included because they have not yet attained any practical significance for engineers.
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