The Turbulent Very Wide-gap Taylor-Couette Flow
Author: Mohammed Hussein Haytham Hamede
Publisher:
Published: 2023
Total Pages: 0
ISBN-13:
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Author: Mohammed Hussein Haytham Hamede
Publisher:
Published: 2023
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: Andreas Froitzheim
Publisher: Cuvillier Verlag
Published: 2019-08-26
Total Pages: 172
ISBN-13: 3736960735
DOWNLOAD EBOOKTurbulent Taylor-Couette flow, where the fluid is confined by two coaxial and independently rotating cylinders, is experimentally investigated within this thesis for medium and wide gaps. To reveal the influence of flow patterns on the angular momentum transport, direct torque measurements, flow visualizations and particle image velocimetry are performed in two different facilities. For the largely unexplored radius ratio regime of η = 0.357, the directly measured torque features a transition as a function of shear, which is connected to the capacity of the outer cylinder to emit small-scale plumes. When the cylinders rotate slightly in counter-direction, a maximum in torque occurs at μmax = -0.123, which is induced by the formation of large-scale Taylor vortices. The contribution of these vortices to the overall momentum transport clearly exceeds the contribution of the turbulent fluctuations for η = 0.5. Furthermore, the large-scale Taylor rolls are driven by small-scale plumes and feature azimuthally traveling waves for η = 0.714. Accordingly, the angular momentum transport in medium and wide-gap turbulent Taylor-Couette flow is determined by the interaction of turbulence and flow patterns of different scales.
Author: C. David Andereck
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 351
ISBN-13: 1461534380
DOWNLOAD EBOOKSeldom does a physical system, particularly one as apparently simple as the flow of a Newtonian fluid between concentric rotating cylinders, retain the interest of scientists, applied mathematicians and engineers for very long. Yet, as this volume goes to press it has been nearly 70 years since G. I. Taylor's outstanding experimental and theoretical study of the linear stability of this flow was published, and a century since the first experiments were performed on rotating cylinder viscometers. Since then, the study of this system has progressed enormously, but new features of the flow patterns are still being uncovered. Interesting variations on the basic system abound. Connections with open flows are being made. More complex fluids are used in some experiments. The vigor of the research going on in this particular example of nonequilibrium systems was very apparent at the NATO Advanced Research Workshop on "Ordered and Turbulent Patterns in Taylor Couette Flow," held in Columbus, Ohio, USA May 22-24, 1991. A primary goal of this ARW was to bring together those interested in pattern formation in the classic Taylor Couette problem with those looking at variations on the basic system and with those interested in related systems, in order to better define the interesting areas for the future, the open questions, and the features common (and not common) to closed and open systems. This volume contains many of the contributions presented during the workshop.
Author: P. A. Davidson
Publisher: Cambridge University Press
Published: 2013-09-12
Total Pages: 701
ISBN-13: 1107434343
DOWNLOAD EBOOKThere are two recurring themes in astrophysical and geophysical fluid mechanics: waves and turbulence. This book investigates how turbulence responds to rotation, stratification or magnetic fields, identifying common themes, where they exist, as well as the essential differences which inevitably arise between different classes of flow. The discussion is developed from first principles, making the book suitable for graduate students as well as professional researchers. The author focuses first on the fundamentals and then progresses to such topics as the atmospheric boundary layer, turbulence in the upper atmosphere, turbulence in the core of the earth, zonal winds in the giant planets, turbulence within the interior of the sun, the solar wind, and turbulent flows in accretion discs. The book will appeal to engineers, geophysicists, astrophysicists and applied mathematicians who are interested in naturally occurring turbulent flows.
Author: A. A. R. Townsend
Publisher: Cambridge University Press
Published: 1976
Total Pages: 450
ISBN-13: 9780521298193
DOWNLOAD EBOOKDevelops a physical theory from the mass of experimental results, with revisions to reflect advances of recent years.
Author: Pascal Chossat
Publisher: Springer
Published: 1994-03-11
Total Pages: 234
ISBN-13: 9780387941547
DOWNLOAD EBOOK1. 1 A paradigm About one hundred years ago, Maurice Couette, a French physicist, de signed an apparatus consisting of two coaxial cylinders, the space between the cylinders being filled with a viscous fluid and the outer cylinder being rotated at angular velocity O2. The purpose of this experiment was, follow ing an idea of the Austrian physicist Max Margules, to deduce the viscosity of the fluid from measurements of the torque exerted by the fluid on the inner cylinder (the fluid is assumed to adhere to the walls of the cylinders). At least when O is not too large, the fluid flow is nearly laminar and 2 the method of Couette is valuable because the torque is then proportional to 110 , where II is the kinematic viscosity of the fluid. If, however, O is 2 2 increased to a very large value, the flow becomes eventually turbulent. A few years later, Arnulph Mallock designed a similar apparatus but allowed the inner cylinder to rotate with angular velocity 01, while O2 = o. The surprise was that the laminar flow, now known as the Couette flow, was not observable when 0 exceeded a certain "low" critical value Ole, even 1 though, as we shall see in Chapter II, it is a solution of the model equations for any values of 0 and O .
Author: Ronald J. Adrian
Publisher: Cambridge University Press
Published: 2011
Total Pages: 585
ISBN-13: 0521440084
DOWNLOAD EBOOKParticle image velocimetry, or PIV, refers to a class of methods used in experimental fluid mechanics to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid. Although the concept of measuring particle displacements is simple in essence, the factors that need to be addressed to design and implement PIV systems that achieve reliable, accurate, and fast measurements and to interpret the results are surprisingly numerous. The aim of this book is to analyze and explain them comprehensively.
Author: H.L. Swinney
Publisher: Springer
Published: 2014-03-12
Total Pages: 306
ISBN-13: 9783662309360
DOWNLOAD EBOOKAuthor: Dennis Paulus Maria Gils
Publisher:
Published: 2011
Total Pages: 171
ISBN-13: 9789036532723
DOWNLOAD EBOOKAuthor: E. L. Koschmieder
Publisher: Cambridge University Press
Published: 1993-02-26
Total Pages: 356
ISBN-13: 9780521402040
DOWNLOAD EBOOKThis book describes the motions resulting from heating a fluid layer from below.