An Experimental Study of Plane Turbulent Couette Flow PDF Download
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Author: Henry Frederick Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 138
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Author: Henry Frederick Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 138
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Author: Robert Joel Barnett
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 166
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Author: Larry Joe Huey
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 334
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Author: H. Bippes
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Author: Bayode Owolabi
Publisher: Springer
ISBN: 303019745X
Category : Science
Languages : en
Pages : 141
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Book Description
This book presents several new findings in the field of turbulent duct flows, which are important for a range of industrial applications. It presents both high-quality experiments and cutting-edge numerical simulations, providing a level of insight and rigour rarely found in PhD theses. The scientific advancements concern the effect of the Earth’s rotation on large duct flows, the experimental confirmation of marginal turbulence in a pressure-driven square duct flow (previously only predicted in simulations), the identification of similar marginal turbulence in wall-driven flows using simulations (for the first time by any means) and, on a separate but related topic, a comprehensive experimental study on the phenomenon of drag reduction via polymer additives in turbulent duct flows. In turn, the work on drag reduction resulted in a correlation that provides a quantitative prediction of drag reduction based on a single, measurable material property of the polymer solution, regardless of the flow geometry or concentration. The first correlation of its kind, it represents an important advancement from both a scientific and practical perspective.
Author: Andreas Froitzheim
Publisher: Cuvillier Verlag
ISBN: 3736960735
Category : Technology & Engineering
Languages : en
Pages : 172
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Book Description
Turbulent 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: Yau Wu
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Author: C. David Andereck
Publisher: Springer Science & Business Media
ISBN: 1461534380
Category : Science
Languages : en
Pages : 351
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Seldom 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: Augustine Chi-Fung Cheung
Publisher:
ISBN:
Category :
Languages : en
Pages : 522
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Author: Ernest M. Thurlow
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 276
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