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Author :
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.:/5 (94 download)
Download or read book Particle Pair Dispersion in Turbulent Flows written by and published by . This book was released on 2005 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leonid I. Zaichik
Publisher : John Wiley & Sons
ISBN 13 : 3527626263
Total Pages : 318 pages
Book Rating : 4.5/5 (276 download)
Download or read book Particles in Turbulent Flows written by Leonid I. Zaichik and published by John Wiley & Sons. This book was released on 2008-12-04 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only work available to treat the theory of turbulent flow with suspended particles, this book also includes a section on simulation methods, comparing the model results obtained with the PDF method to those obtained with other techniques, such as DNS, LES and RANS. Written by experienced scientists with background in oil and gas processing, this book is applicable to a wide range of industries -- from the petrol industry and industrial chemistry to food and water processing.
Author : Jennifer Jucha
Publisher : Springer
ISBN 13 : 3319191926
Total Pages : 121 pages
Book Rating : 4.3/5 (191 download)
Download or read book Time-Symmetry Breaking in Turbulent Multi-Particle Dispersion written by Jennifer Jucha and published by Springer. This book was released on 2015-07-20 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents experimental and theoretical investigations of the connection between the time asymmetry in the short-time evolution of particle clusters and the intrinsic irreversibility of turbulent flows due to the energy cascade. The term turbulence describes a special state of a continuous medium in which many interacting degrees of freedom are excited. One of the interesting phenomena observed in turbulent flows is their time irreversibility. When milk is stirred into coffee, for example, highly complex and interwoven structures are produced, making the mixing process irreversible. This behavior can be analyzed in more detail by studying the dispersion of particle clusters. Previous experimental and numerical studies on the time asymmetry in two-particle dispersion indicate that particles separate faster backwards than forwards in time, but no conclusive explanation has yet been provided. In this thesis, an experimental study on the short-time behavior of two- and four-particle dispersion in a turbulent water flow between two counter-rotating propellers is presented. A brief but rigorous theoretical analysis reveals that the observed time irreversibility is closely linked to the turbulence energy cascade. Additionally, it is demonstrated experimentally that the addition of minute amounts of polymers to the flow has a significant impact on multi-particle dispersion due to an alteration of the energy cascade.
Author : Jean-Pierre Minier
Publisher : Springer
ISBN 13 : 3319415670
Total Pages : 268 pages
Book Rating : 4.3/5 (194 download)
Download or read book Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration written by Jean-Pierre Minier and published by Springer. This book was released on 2016-07-26 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents an up-to-date review of turbulent two-phase flows with the dispersed phase, with an emphasis on the dynamics in the near-wall region. New insights to the flow physics are provided by direct numerical simuation and by fine experimental techniques. Also included are models of particle dynamics in wall-bounded turbulent flows, and a description of particle surface interactions including muti-layer deposition and re-suspension.
Author : Stephanie Paustian
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (91 download)
Download or read book Tracking and Pair Dispersion Analysis of Buoyant Particles in a Turbulent Shear Flow written by Stephanie Paustian and published by . This book was released on 2015 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented are experimental measurements of one and two-particle dispersion in a turbulent shear flow. The baseline flow is a well-characterized high Reynolds number turbulent submerged round jet. Buoyant air bubbles and canola oil droplets were injected into the jet within the self-similar region at five injection locations and five jet Reynolds numbers ranging from 18,000 to 34,000. Images of two particles, injected simultaneously, were obtained from high-speed shadowgraphy. The particles were then tracked using a four-frame predictive algorithm. The influence of mean shear and turbulent fluctuations on dispersion is analyzed for initial positions where a mean velocity shear is superimposed on turbulent fluctuations. The results were analyzed to determine the influence of the density ratio, the non-dimensional shear rate, Reynolds number, and the turbulence intensity (these last three associated with the location of injection) on single-particle and two-particle dispersion.
Author : Kenneth T. Kiger
Publisher :
ISBN 13 :
Total Pages : 368 pages
Book Rating : 4.:/5 (318 download)
Download or read book Particle Dispersion and Inter-phase Kinetic Energy Transfer in a Turbulent, Two-phase Shear Layer written by Kenneth T. Kiger and published by . This book was released on 1995 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transport of heavy, polydispersed particles and the inter-phase transfer of kinetic energy is measured experimentally in a turbulent shear layer. Specifically, fundamental/subharmonic forcing and conditional-averaging techniques were used to study the particle/turbulence interaction with the large-scale, spanwise, coherent vortices, starting from their initial roll-up through the first pairing event. It is shown that the pairing event plays a homogenizing role on the particulate field, but the amount of homogenization is strongly dependent upon the particle's viscous relaxation time, the eddy turnover time, as well as the time the particles are allowed to interact with each scale prior to a pairing event. Thus, even though the smaller size particles become well-mixed across the structure, the larger sizes are still dispersed in an inhomogeneous fashion. The dispersed/carrier phase coupling was examined through the measurement of conditionally-averaged kinetic energy transfer (which results from the work done to accelerate or decelerate the dispersed phase), as well as the conditionally-averaged particle dissipation (energy dissipated by shear deformation in the carrier phase due to the relative slip between the particles and the carrier fluid).
Author : Kyle Paul Sala
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (828 download)
Download or read book Analysis of Stochastic Methods for Predicting Particle Dispersion in Turbulent Flows written by Kyle Paul Sala and published by . This book was released on 2013 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current research seeks to develop a computational model that accurately describes particle dispersion in turbulent flow. Current particle dispersion models do not accurately predict the small-scale clumping of particles in turbulent flow that occurs due to interaction with turbulent eddies. A new stochastic vortex structure (SVS) model was developed and compared with current stochastic Lagrangian models (SLM) for turbulent flows. To examine what characteristics of the fluid flow field that lead to dispersion of particles, a number of non trivial measures were used. A discrete-element model is used to transport particle locations for cases with and without adhesive forces. Direct numerical simulations (DNS) are used as a baseline for comparison between the two models. Initial results show that the SVS model matches the spatial structure of the flow field of DNS reasonably well, while the SLMs do not. Investigation of particle collision rate suggest that while SVS matches the large length scales of flow, it omits the smaller scales of the flow.
Author : Robert H. Kraichnan
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (216 download)
Download or read book Dispersion of Particle Pairs in Homogeneous Turbulence written by Robert H. Kraichnan and published by . This book was released on 1966 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relative dispersion of particle pairs in homogeneous turbulence is treated by the Lagrangian-history direct-interaction closure approximation for a conserved scalar field. Richardson's diffusion equation emerges, with the sole difference that the eddy diffusivity depends on the duration of the dispersion as well as on particle separation. The diffusivity tensor is evaluated in the inertial range, and the probability distribution for the separation distance of a particle pair is computed for long-time, inertial-range dispersion. From this solution, numerical values are obtained for the dimensionless constants in Richardson's law for mean-square separation distance and Oboukhov's scalar-field inertial-range spectrum law. An inequality relating these two constants is inferred from qualitative considerations, without use of the closure approximation. (Author).
Author : Hans-Hermann Fernholz
Publisher : Springer Science & Business Media
ISBN 13 : 3642838227
Total Pages : 528 pages
Book Rating : 4.6/5 (428 download)
Download or read book Advances in Turbulence 2 written by Hans-Hermann Fernholz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second European Turbulence Conference was held at the Technische Univer sitat Berlin, Federal Republic of Germany, from August 30th to September 2nd 1988 under the auspices of the European Mechanics Committee. It was primar ily devoted to fundamental aspects of turbulence, and aimed at bringing together engineers, physicists, and mathematicians. The scientific committee - serving also as Sub-committee of the European Turbulence Conference - consisted of the following members: G. Comte-Bellot (Lyon), H.-H. Fernholz and H.E. Fiedler (both from Berlin) as co-chairmen of the conference, U. Frisch (Nice), J.C.R. Hunt (Cambridge), E. Krause (Aachen), M. Landahl (Stockholm), A.M. Obukhov (Moscow), and G. Ooms (Amsterdam). The conference programme comprised 6 invited lectures and 94 contributions, presented either orally or at poster sessions. There were 165 participants from 18 countries. All papers published in these conference proceedings were, with the exception of the invited ones, again refereed by the members of the scientific committee. The main research topics discussed at this meeting were stability and gener ation of turbulence, effects of rotation, stratification and buoyancy forces, novel instrumentation, manipulation and control, boundary layers with separation and reattachment, computer simulation, turbulent diffusion, image analysis and flow visualization, vorticity dynamics and turbulence, and large-scale structures. We have taken the liberty of regrouping some papers following the submitted final versions for this volume. Authors may therefore find their paper under a different heading from that in the conference programme.
Author : Benigno J. Lazaro
Publisher :
ISBN 13 :
Total Pages : 446 pages
Book Rating : 4.:/5 (52 download)
Download or read book Particle Dispersion in Turbulent Free Sheer Flows written by Benigno J. Lazaro and published by . This book was released on 1989 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shao Lin Lee
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.3/5 (91 download)
Download or read book On the Motions of Particles in Turbulent Flows written by Shao Lin Lee and published by . This book was released on 1980 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald Alexander Kennedy
Publisher :
ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (227 download)
Download or read book Some Measurements of the Dispersion of Spheres in a Turbulent Flow written by Donald Alexander Kennedy and published by . This book was released on 1965 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dispersion of small spherical particles in a grid generated turbulent flow was investigated. Particles were injected singly into the flow without inducing an appreciable disturbance. A detection method utilizing photo multiplier tubes and light fields was devised. The particles used in the experiment were foamed polystyrene of 0.7 and 0.9 millimeter diameter and soap bubbles of 1.25 millimeter diameter. A fine heated wire was used to 'tag' fluid particles in order to obtain Lagrangian data on the flow. Diffusion coefficients, particle velocity auto correlation in time functions, integral and micro-scales were obtained from the data. (Author).
Author : Guido Lupieri
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (14 download)
Download or read book An Investigation of Particle Dispersion in a Tidally Driven Turbulent Flow written by Guido Lupieri and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Modeling Study on Particle Dispersion in Wall-Bounded Turbulent Flows written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Benigno J. Lazaro
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (599 download)
Download or read book Particle Dispersion in Turbulent Free Shear Flows written by Benigno J. Lazaro and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (936 download)
Download or read book Numerical Study of Particle Dispersion Phenomena in Turbulent Flows written by and published by . This book was released on 2015 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. C. Vassilicos
Publisher : Cambridge University Press
ISBN 13 : 9780521792219
Total Pages : 292 pages
Book Rating : 4.7/5 (922 download)
Download or read book Intermittency in Turbulent Flows written by J. C. Vassilicos and published by Cambridge University Press. This book was released on 2001 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume was the product of a workshop held at the Newton Institute in Cambridge, and examines turbulence, intermittency, nonlinear dynamics and fluid mechanics.
