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A Lagrangian Study Of The Transverse Diffusion Of Large Nearly Neutrally Buoyant Particles In Turbulent Pipe Flow
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Book Synopsis A Lagrangian Study of the Transverse Diffusion of Large Nearly Neutrally Buoyant Particles in Turbulent Pipe Flow by : Maxwell Richard Holland
Download or read book A Lagrangian Study of the Transverse Diffusion of Large Nearly Neutrally Buoyant Particles in Turbulent Pipe Flow written by Maxwell Richard Holland and published by . This book was released on 1973 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of the Transverse Diffusion of Large Nearly Neutrally Buoyant Particles in Turbulent Pipe Flow by : Ian Chapman O'Neill
Download or read book A Study of the Transverse Diffusion of Large Nearly Neutrally Buoyant Particles in Turbulent Pipe Flow written by Ian Chapman O'Neill and published by . This book was released on 1969 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particles in Turbulent Flows by : Leonid I. Zaichik
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.
Book Synopsis Stochastic Lagrangian Modeling for Large Eddy Simulation of Dispersed Turbulent Two-Phase Flows by : Abdallah Sofiane Berrouk
Download or read book Stochastic Lagrangian Modeling for Large Eddy Simulation of Dispersed Turbulent Two-Phase Flows written by Abdallah Sofiane Berrouk and published by Bentham Science Publishers. This book was released on 2011 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Turbulent Particle-Laden Gas Flows by : Aleksei Y. Varaksin
Download or read book Turbulent Particle-Laden Gas Flows written by Aleksei Y. Varaksin and published by Springer Science & Business Media. This book was released on 2007-07-05 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents results of experimental and theoretical studies of "gas-solid particles" turbulent two-phase flows. It analyzes the characteristics of heterogeneous flows in channels (pipes), as well as those in the vicinity of the critical points of bodies subjected to flow and in the boundary layer developing on their surface. Coverage also treats in detail problems of physical simulation of turbulent gas flows which carry solid particles.
Book Synopsis Lagrangian Measurements of Kolmogorov Size Neutrally Buoyant Particles in Turbulent Flow by : David Ratner
Download or read book Lagrangian Measurements of Kolmogorov Size Neutrally Buoyant Particles in Turbulent Flow written by David Ratner and published by . This book was released on 2010 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Motions of Particles in Turbulent Flows by : Shao Lin Lee
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:
Book Synopsis On the Full Lagrangian Approach and Thermophoretic Deposition in Gas-particle Flows by : David Patrick Healy
Download or read book On the Full Lagrangian Approach and Thermophoretic Deposition in Gas-particle Flows written by David Patrick Healy and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical and experimental studies of particle deposition in turbulent pipe flow have been carried out for over forty years, but some of the most important transport mechanisms are still not well understood. The first part of this thesis is concerned with the calculation of particle density when using Lagrangian methods to predict inertial particle transport in two-dimensional laminar fluid flows. Traditionally, Lagrangian calculations involve integrating the particle equations of motion along particle pathlines, and the particle density is obtained by applying a statistical averaging procedure to those pathlines which intersect a particular computational grid cell. Unfortunately, extremely large numbers of particles are required to reduce the statistical errors to acceptable levels, and this makes the method computationally expensive. Recently, the Full Lagrangian approach has been developed, which allows the direct calculation of the particle density along particle pathlines. This method had previously been applied only to simple analytical flow fields. The application of the method to CFD generated fluid velocity fields was shown to be possible, and the results obtained using the Full Lagrangian approach were compared to those from a traditional Lagrangian approach. It was found that better quality solutions could be obtained with the use of far fewer particle pathlines. An analysis of the manner in which the Full Lagrangian approach deals with particles whose paths cross each other (and the resulting discontinuity in particle density) was also undertaken, and this illustrates the sophistication of the method. The second part of the thesis comprises an experimental and theoretical study of the deposition of small particles in turbulent flows by thermophoresis. Thermophoresis is the phenomenon whereby small particles suspended in a gas in which there exists a temperature gradient experience a force in the direction opposite from that of the temperature gradient. Previous researchers have attempted to impose a radial temperature difference in pipe flow experiments, but have not yet succeeded in attaining a constant thermophoretic force along the length of the pipe. This limits the accuracy and usefulness of the data for the validation of theoretical expressions for the thermophoretic fluxes. An experimental rig has been designed to achieve a constant thermophoretic force. This was done by using an annular geometry with a cold inner wall and hot outer wall. The particle size was varied and the deposition flux was measured for turbulent flow with three temperature differences. The deposition fluxes for small particles were found to be independent of dimensionless particle size, with each increase in temperature difference resulting in an increase in magnitude of the flux. Evidence of a thermophoresis-turbulence coupling was found for intermediate-sized particles, and large particles were not influenced by thermophoresis. A theory of particle deposition, developed for the case of turbulent pipe flow, was modified to study flow in a turbulent annulus, so that theoretical expressions for the thermophoretic fluxes could be included and compared with the experimental results. Agreement with experimental data was quite good, but some deficiencies in a widely used theoretical expression for the thermophoretic flux were exposed. An alternative expression was used, which gave much better agreement with the experimental data, and the mechanisms behind the thermophoresis-turbulence coupling were also investigated. The validation of this expression for the thermophoretic force will allow its inclusion in numerical studies of particle deposition in more complex geometries.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stochastic Lagrangian Models of Turbulent Diffusion by : Howard C. Rodean
Download or read book Stochastic Lagrangian Models of Turbulent Diffusion written by Howard C. Rodean and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is intended to give atmospheric scientists a basic understanding of the physical and mathematical foundations of stochastic Lagrangian models of turbulent diffusion.
Book Synopsis Lagrangian Properties of Turbulent Channel Flow by : Juan Ignacio Polanco
Download or read book Lagrangian Properties of Turbulent Channel Flow written by Juan Ignacio Polanco and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lagrangian perspective, describing a flow from the trajectories of fluid tracers, isa natural framework for studying dispersion phenomena in turbulent flows. In wall-boundedturbulence, the motion of fluid tracers is affected by mean shear and by strong inhomogeneityand anisotropy near walls. We investigate the Lagrangian properties of a turbulent channel flowusing direct numerical simulations at a moderate Reynolds number. Lagrangian accelerationstatistics are compared to particle tracking experiments performed in parallel to this work. Asin homogeneous isotropic turbulence (HIT), the acceleration components along Lagrangianpaths decorrelate over time scales representative of the smallest scales of the flow, while theacceleration norm stays correlated for much longer. The persistence of small-scale anisotropy farfrom the wall is demonstrated in the form of a non-zero cross-correlation between accelerationcomponents. As a result of the average fluxes of kinetic energy in wall turbulence, tracers initiallylocated close to the wall travel and spread over longer distances when tracked backwardsin time than forwards. The relative dispersion of tracer pairs is finally investigated. At shorttimes, pair separation is ballistic for all wall distances. As in HIT, relative dispersion is timeasymmetric, with tracers separating faster when tracked backwards in time. At longer times,mean shear dominates leading to rapid separation in the mean flow direction. A ballisticcascade model previously proposed for HIT is adapted to inhomogeneous flows.
Download or read book The Mechanics of Turbulence written by and published by . This book was released on 1964 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Theoretical Investigation of Transverse Particle Motion in Turbulent Pipe Flow by : Mary Alice Wiesler
Download or read book A Theoretical Investigation of Transverse Particle Motion in Turbulent Pipe Flow written by Mary Alice Wiesler and published by . This book was released on 1983 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experiments And Data Processing For Turbulent Flows Using Eulerian And Lagrangian Techniques by : Stephanie Jean Neuscamman
Download or read book Experiments And Data Processing For Turbulent Flows Using Eulerian And Lagrangian Techniques written by Stephanie Jean Neuscamman and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the study of turbulent flows, two reference frames exist in which fluid properties can be measured: a frame fixed in space, the Eulerian viewpoint, or a frame moving with the particle trajectory, the Lagrangian viewpoint. Turbulence research has been advanced primarily on experiments conducted using Eulerian techniques, but the developing Lagrangian methods are needed in order to determine the full acceleration, its temporal and spatial variation, of fluid particles. This research looks at two different problems involving turbulence: a turbulent boundary layer evolving beneath a turbulent free stream and the Lagrangian tracking of particles in turbulent flows. The results of Eulerian measurements of a turbulent boundary layer evolving beneath free-stream turbulence using hot-wire anemometry are reported. The flat-plate boundary layer was created on a glass plate in a low-speed wind tunnel and freestream turbulence was generated by an active grid. Systematic variation of the freestream conditions from very low turbulence (0.25% turbulence intensity) to high turbulence (10.5% intensity) showed effects well within the boundary layer. The freestream Reynolds number based on the Taylor micro-scale varied between 20 and 550; the boundary-layer momentum-thickness Reynolds number varied from 550 to almost 3,000. At high turbulence intensities, the effects of the free-stream turbulence extend deep into the boundary layer: affecting especially the velocity variances and the energy spectra. The energy spectra display a double-peak, for both near-laminar and turbulent free-streams. At very-low free-stream turbulence intensities, the two peaks represent the inner and outer scales of the turbulent boundary layer. With higher intensity free-stream turbulence present, the energy associated with the free-stream peak dominates the outer peak of the boundary layer. A detailed description of the Lagrangian particle tracking framework used in experiments at Cornell University is presented. The theory and detailed instructions on the implementation of Lagrangian particle tracking are included. Camera calibration, both from a mask of points and using found particle data output from the tracking code from actual experiments (dynamic calibration) is described. The code used to conduct the analysis of particle image data obtained from the cameras is presented in detail. The code performs three main steps: 1) particle center finding, 2) stereomatching (determining particle 3D coordinates, if more than one camera is used), and 3) tracking particles through the time-series of images to construct trajectories. Each of these steps is conducted by a function called by the controller program. The controller program takes information such as the camera image filenames, the number of movies to be processed, the location and name of the calibration parameters file, and image intensity threshold values and outputs the reconstructed particle trajectory information in a data file. In order to assist future users of the code, the details of the original code and all edits made by the author have been included.
Book Synopsis Numerical Analysis of Transverse Particle Motion in Turbulent Pipe Flow by : Peter Chunlung Wong
Download or read book Numerical Analysis of Transverse Particle Motion in Turbulent Pipe Flow written by Peter Chunlung Wong and published by . This book was released on 1986 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Eulerian and Lagrangian Investigations in Simple Turbulent Flows by : Sathyanarayana Ayyalasomayajula
Download or read book Experimental Eulerian and Lagrangian Investigations in Simple Turbulent Flows written by Sathyanarayana Ayyalasomayajula and published by . This book was released on 2007 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies in Turbulence by : Thomas B Gatski
Download or read book Studies in Turbulence written by Thomas B Gatski and published by . This book was released on 1991-12-03 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
