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The Moody Diagram has been used to estimate
frictional losses in smooth and rough pipes since it was first proposed in
1944. Recent experiments at Princeton in fully-developed turbulent pipe flow
have shown that many of the assumptions made in deriving this engineering
guide are not correct. In particular, a detailed study of the velocity
profile in a smooth pipe at very high Reynolds numbers has led to an
improved correlation for the smooth pipe friction factor, and a careful
examination of the behavior for rough surfaces demonstrates the shortcomings
of the friction factor correlation used by Moody for transitionally rough
surfaces.
Dr. Smits is Professor
of Mechanical and Aerospace Engineering at Princeton University. He received
his Ph.D. from the University of Melbourne, Australia. After serving two
years as a Research Assistant to Prof. P. Bradshaw at Imperial College, he
returned to the University of Melbourne as a Research Fellow, working with
Prof. P. N. Joubert. He joined the faculty at Princeton 1981, serving as
Chairman of his department from 1998 to 2004. His research interests are
centered on experimental research in turbulent fluid mechanics. Particular
aspects include the behavior of turbulent boundary layers at subsonic
through hypersonic speeds, the response of boundary layers to extra strain
rates, shockwave/boundary layer interactions, flow control, Taylor-Couette
flows, fluid-structure interaction, sports ball aerodynamics, and
measurement technique development. Prof. Smits has served as the Director of
the Princeton University Gasdynamics Laboratory since 1989. He is the author
or co-author of about 250 journal articles and papers in conference
proceedings. He is the co-author (with J.P. Dussauge) of Turbulent Shear
Layers in Compressible Flow, author of A Physical Introduction to
Fluid Mechanics, and co-editor (with T.T. Lim) of Flow Visualization:
Techniques and Examples. He has served as an Associate Editor and
Editor-in-Chief for Experimental and Thermal Fluid Science, and
Associate Editor of Physics of Fluids. He currently is an Associate
Editor of the Journal of Fluid Mechanics and the Journal of
Turbulence. He is Chief Editor,
http://www.efluids.com, a specialty web portal for students and
researchers in fluid dynamics, and a
Founding Partner, iCentral LLC, a publisher of specialty web portals. He is
Fellow of the American Physical Society, the American Institute of
Aeronautics and Astronautics, the Royal Aeronautical Society, and the
Institute of Physics. He is a four-time recipient of the Princeton
Engineering Council Award for Excellence in Teaching. In 2004, Dr. Smits
received the Fluid Dynamics Award of the AIAA.
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