Measurement of Particle Dispersion in Turbulent Pipe Flow PDF Download
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Author: Gylfi Arnason
Publisher:
ISBN:
Category : Pipe
Languages : en
Pages : 276
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Book Description
Author: Gylfi Arnason
Publisher:
ISBN:
Category : Pipe
Languages : en
Pages : 276
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Book Description
Author: Shao Lin Lee
Publisher:
ISBN:
Category : Particles
Languages : en
Pages : 92
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Book Description
Author: Christopher Buergin Rogers
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 220
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Book Description
Author:
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 142
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Book Description
Author: Steven B. Ainley
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 376
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Book Description
A method for emulating the motion of a particle with a time constant on the order of the fluid turbulent time scales was investigated for a turbulent channel flow. This method was used to measure the fluid velocity in the reference frame of the moving particle (particle-Lagrangian reference frame). The objectives were to calculate the fluid and particle turbulence statistics along the particle path and to develop a model which predicts the dispersion with only the knowledge of the fluid turbulence and the particle parameters. The particles were assumed to have much greater density than the surrounding fluid and the Stokes flow around the particle was assumed. The path of a solid particle was emulated by mounting a two component laser velocimeter (LV) system on a two-dimensional traverse system. The fluid velocity in two components was measured by the LV and then sent to the computer. The instantaneous acceleration that a real particle would undergo in each direction was calculated using the measured fluid velocity and the Stokes transport equation. When the traverse had reached its new desired velocity (5 ms), the fluid velocity was measured and the sequence repeated. This cycle required 10 ms to complete compared to an estimated Kolmogorov time scale of 200 msec. Fluid and particle velocity autocorrelation functions, energy spectra, and turbulence intensity measurements were taken along a particle path for particles with Stokes numbers ranging from 0.5 to 3.5 and drift velocities ranging from 0% to 10% of the mean centerline velocity. The Reynolds numbers (based on centerline velocity and channel half-width) were 3300 and 6600. The fluid velocity field observed from the particle-Lagrangian reference frame was weakly affected by the particle time constant but was strongly affected by the drift velocity. The particle response, however, was strongly affected by the particle time constant, as would be expected. A model was developed to predict particle dispersion. This model compared favorably to the measured particle dispersion especially for Stokes numbers near unity and small drift velocities.
Author:
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 122
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Book Description
Author: Bernard Geurts
Publisher: Springer Science & Business Media
ISBN: 1402062184
Category : Science
Languages : en
Pages : 409
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Book Description
This book contains a selection of the papers that were presented at the EUROMECH colloquium on particle-laden flow held at the University of Twente in 2006. The multiscale nature of this challenging field motivated the calling of the colloquium and reflects the central importance that the dispersion of particles in a flow has in various geophysical and environmental problems. The spreading of aerosols and soot in the air, the growth and dispersion of plankton blooms in seas and oceans, or the transport of sediment in rivers, estuaries and coastal regions are striking examples.
Author: Abdallah Sofiane Berrouk
Publisher: Bentham Science Publishers
ISBN: 1608052966
Category : Science
Languages : en
Pages : 130
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Book Description
Understanding the dispersion and the deposition of inertial particles convected by turbulent flows is a domain of research of considerable industrial interest. Inertial particle transport and dispersion are encountered in a wide range of flow configurations, whether they are of industrial or environmental character. Conventional models for turbulent dispersed flows do not appear capable of meeting the growing needs of chemical, mechanical and petroleum industries in this regard and physical environment testing is prohibitive. Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) ha.
Author: Ronald J. Adrian
Publisher: Cambridge University Press
ISBN: 0521440084
Category : Science
Languages : en
Pages : 585
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Book Description
Particle 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: Efstathios Michaelides
Publisher: CRC Press
ISBN: 1315354624
Category : Science
Languages : en
Pages : 1559
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Book Description
The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.
