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Stereoscopic Measurements Of Particle Dispersion In Microgravity Turbulent Flow
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Book Synopsis Stereoscopic Measurements of Particle Dispersion in Microgravity Turbulent Flow by : Daniel Eduardo Groszmann
Download or read book Stereoscopic Measurements of Particle Dispersion in Microgravity Turbulent Flow written by Daniel Eduardo Groszmann and published by . This book was released on 2001 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal was to compare the dispersion of different Stokes number particles in zero gravity and decouple the effects of inertia and gravity on the dispersion. Results show that higher inertia particles disperse less in zero gravity, in agreement with current models. Particles with St & ap; 200--300 dispersed about 110 of the dispersion measured in St & ap; 1 particles. Similarly, fluid points were shown to disperse 25 times as much as St & ap; 1 particles. Particles with more inertia also have particle velocity autocorrelations that decay more slowly. Comparisons are made with previous experimental work and indicate 40% less dispersion with gravity for St & ap; 1 particles and a slower decorrelation rate.
Book Synopsis Some Measurements of the Dispersion of Spheres in a Turbulent Flow by : Donald Alexander Kennedy
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).
Book Synopsis Time-Symmetry Breaking in Turbulent Multi-Particle Dispersion by : Jennifer Jucha
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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flowing Matter written by Federico Toschi and published by Springer Nature. This book was released on 2019-09-25 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book, published in the Soft and Biological Matter series, presents an introduction to selected research topics in the broad field of flowing matter, including the dynamics of fluids with a complex internal structure -from nematic fluids to soft glasses- as well as active matter and turbulent phenomena. Flowing matter is a subject at the crossroads between physics, mathematics, chemistry, engineering, biology and earth sciences, and relies on a multidisciplinary approach to describe the emergence of the macroscopic behaviours in a system from the coordinated dynamics of its microscopic constituents. Depending on the microscopic interactions, an assembly of molecules or of mesoscopic particles can flow like a simple Newtonian fluid, deform elastically like a solid or behave in a complex manner. When the internal constituents are active, as for biological entities, one generally observes complex large-scale collective motions. Phenomenology is further complicated by the invariable tendency of fluids to display chaos at the large scales or when stirred strongly enough. This volume presents several research topics that address these phenomena encompassing the traditional micro-, meso-, and macro-scales descriptions, and contributes to our understanding of the fundamentals of flowing matter. This book is the legacy of the COST Action MP1305 “Flowing Matter”.
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 Analysis of Stochastic Methods for Predicting Particle Dispersion in Turbulent Flows by : Kyle Paul Sala
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.
Book Synopsis Particle Image Velocimetry by : Ronald J. Adrian
Download or read book Particle Image Velocimetry written by Ronald J. Adrian and published by Cambridge University Press. This book was released on 2011 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiphase Particulate Systems in Turbulent Flows by : Wioletta Podgórska
Download or read book Multiphase Particulate Systems in Turbulent Flows written by Wioletta Podgórska and published by CRC Press. This book was released on 2019-09-17 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase Particulate Systems in Turbulent Flows: Fluid-Liquid and Solid-Liquid Dispersions provides methods necessary to analyze complex particulate systems and related phenomena including physical, chemical and mathematical description of fundamental processes influencing crystal size and shape, suspension rheology, interfacial area of drops and bubbles in extractors and bubble columns. Examples of mathematical model formulation for different processes taking place in such systems is shown. Discussing connections between turbulent mixing mechanisms and precipitation, it discusses influence of fine-scale structure of turbulence, including its intermittent character, on breakage of drops, bubbles, cells, plant cell aggregates. An important aspect of the mathematical modeling presented in the book is multi-fractal, taking into account the influence of internal intermittency on different phenomena. Key Features Provides detailed descriptions of dispersion processes in turbulent flow, interactions between dispersed entities, and continuous phase in a single volume Includes simulation models and validation experiments for liquid-liquid, gas-liquid, and solid-liquid dispersions in turbulent flows Helps reader learn formulation of mathematical models of breakage or aggregation processes using multifractal theory Explains how to solve different forms of population balance equations Presents a combination of theoretical and engineering approaches to particulate systems along with discussion of related diversity, with exercises and case studies
Book Synopsis Particle-Laden Flow by : Bernard Geurts
Download or read book Particle-Laden Flow written by Bernard Geurts and published by Springer Science & Business Media. This book was released on 2007-10-20 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Modeling Atmospheric and Oceanic Flows by : Thomas von Larcher
Download or read book Modeling Atmospheric and Oceanic Flows written by Thomas von Larcher and published by John Wiley & Sons. This book was released on 2014-11-24 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling Atmospheric and Oceanic Flows: Insights from Laboratory Experiments and Numerical Simulations provides a broad overview of recent progress in using laboratory experiments and numerical simulations to model atmospheric and oceanic fluid motions. This volume not only surveys novel research topics in laboratory experimentation, but also highlights recent developments in the corresponding computational simulations. As computing power grows exponentially and better numerical codes are developed, the interplay between numerical simulations and laboratory experiments is gaining paramount importance within the scientific community. The lessons learnt from the laboratory–model comparisons in this volume will act as a source of inspiration for the next generation of experiments and simulations. Volume highlights include: Topics pertaining to atmospheric science, climate physics, physical oceanography, marine geology and geophysics Overview of the most advanced experimental and computational research in geophysics Recent developments in numerical simulations of atmospheric and oceanic fluid motion Unique comparative analysis of the experimental and numerical approaches to modeling fluid flow Modeling Atmospheric and Oceanic Flows will be a valuable resource for graduate students, researchers, and professionals in the fields of geophysics, atmospheric sciences, oceanography, climate science, hydrology, and experimental geosciences.
Book Synopsis Particle Dispersion and Deposition in Multiphase Turbulence Flow by : Md Alamgir Hossain
Download or read book Particle Dispersion and Deposition in Multiphase Turbulence Flow written by Md Alamgir Hossain and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two separate studies: a comprehensive 3D CFD investigation for multiparticles in turbulence flow and an extended analytical model for liquid-solid phase are presented in this book. CFD investigation was carried out to predict the hydrodynamic behavior of turbid particle flowing through a horizontal pipe networks including loop consist of bends and straight pipes. Furthermore, the extended analytical model was also re-developed for the liquid-solid system to look at the similar behavior of the solid particles flowing in a turbulent field. These two parallel studies will provide better understandings about the turbidity spikes movements in the drinking water distribution networks. This book is design for the lay reader to advance researcher. Lay readers will get information about CFD modelling and particle modelling technique and the researcher will be benefited in turbulent diffusion modelling and multiphase-multiparticle modelling.
Book Synopsis Tracking and Pair Dispersion Analysis of Buoyant Particles in a Turbulent Shear Flow by : Stephanie Paustian
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.
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 Modeling Approaches and Computational Methods for Particle-laden Turbulent Flows by : Shankar Subramaniam
Download or read book Modeling Approaches and Computational Methods for Particle-laden Turbulent Flows written by Shankar Subramaniam and published by Academic Press. This book was released on 2022-10-20 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling Approaches and Computational Methods for Particle-laden Turbulent Flows introduces the principal phenomena observed in applications where turbulence in particle-laden flow is encountered while also analyzing the main methods for analyzing numerically. The book takes a practical approach, providing advice on how to select and apply the correct model or tool by drawing on the latest research. Sections provide scales of particle-laden turbulence and the principal analytical frameworks and computational approaches used to simulate particles in turbulent flow. Each chapter opens with a section on fundamental concepts and theory before describing the applications of the modelling approach or numerical method. Featuring explanations of key concepts, definitions, and fundamental physics and equations, as well as recent research advances and detailed simulation methods, this book is the ideal starting point for students new to this subject, as well as an essential reference for experienced researchers. - Provides a comprehensive introduction to the phenomena of particle laden turbulent flow - Explains a wide range of numerical methods, including Eulerian-Eulerian, Eulerian-Lagrange, and volume-filtered computation - Describes a wide range of innovative applications of these models
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1985 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
