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Author : S. Balachandar
Publisher :
ISBN 13 :
Total Pages : 270 pages
Book Rating : 4.:/5 (23 download)
Download or read book Particle Coagulation in Homogeneous Turbulence written by S. Balachandar and published by . This book was released on 1988 with total page 270 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 : Hoi-Ying Ng Holman
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (4 download)
Download or read book Particle Coagulation in a Turbulent Plume written by Hoi-Ying Ng Holman and published by . This book was released on 1986 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael A. Delichatsios
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (137 download)
Download or read book Coagulation in turbulent flow : theory and experiment written by Michael A. Delichatsios and published by . This book was released on 1974 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The coagulation of colloidal particles in turbulent flows is investigated theoretically and experimentally. A coagulation model is developed for destabilized particles in an isotropic turbulent flow. Simple binary collision mean free path concepts are employed and for monodisperse systems coagulation rate relations are derived for particle sizes less than and larger than the Kolmogorov microscale of turbulence. Polydisperse systems are also considered and some general results concerning their behavior are obtained. Also discussed are the effects of interparticle repulsion on the coagulation rates. Coagulation experiments are reported on inside fully developed turbulent pipe flows using an approximately monodisperse UCAR latex dispersion in which the particle sizes are less than the Kolmogorov microscale. The flow rate, destabilizer concentration and volume fraction of the dispersed phase were varied in these experiments. The experimental results for destablized particles are shown to agree very well with the theoretical predictions. Brownian motion coagulation experiments for partially destabilized systems are compared with the corresponding turbulent motion experiments and the results indicate that the coagulation efficiency does not appear to depend on the particle transport mode. (Author).
Author : Kyle David Squires
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.F/5 ( download)
Download or read book The Interaction of Particles with Homogeneous Turbulence written by Kyle David Squires and published by . This book was released on 1990 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : I. O. Huebsch
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (227 download)
Download or read book Relative Motion and Coagulation of Particles in a Turbulent Gas written by I. O. Huebsch and published by . This book was released on 1967 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The existing theory of turbulent-accelerative coagulation applies only to particles so small that they respond to all fluid motions, including those of the smallest, most rapidly accelerating eddies (microscale eddies). The maximum particle diameter for which this theory applies is typically 5 to 10 microns. A review of coagulation and small-scale turbulence theory showed that the theory of turbulent-accelerative particle motion relative to the fluid and coagulation may be extended to particles whose relaxation times are greater than the period of microscale eddies. The extension is based on the concept that each such particle moves at a characteristic speed relative to the fluid, corresponding to the speed of the eddy size whose period equals the particle relaxation time. Thus for each particle size there is a 'resonant' eddy size. Different coagulation mechanisms were compared. Apparently the only situation in which turbulent-accelerative coagulation can be more important than gravitational coagulation, is in nuclear-explosion clouds. A method of numerical computation of coagulation due to all the mechanisms cited was developed. (Author).
Author : Shankar Subramaniam
Publisher : Academic Press
ISBN 13 : 0323901344
Total Pages : 588 pages
Book Rating : 4.3/5 (239 download)
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
Author : Aditya U. Karnik
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Direct Numerical Investigations of Dilute Dispersed Flows in Homogeneous Turbulence written by Aditya U. Karnik and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The motivation for the present work is to investigate particle-laden turbulent flows using accurate numerical simulations. In the present work, the carrier phase is modeled using direct numerical simulations (DNS) and the particles are tracked in a Lagrangian sense. Investigations of both one-way and two-way coupled particulate flows in homogeneous isotropic turbulence have been carried out. The phenomenon of interest in one-way coupled simulations is preferential accumulation, which refers to the tendency of heavy particles in isotropic turbulence to collect in regions of high strain and low vorticity. Several measures and mechanisms of accumulation have been reported in the literature often showing conflicting scaling with particle and fluid parameters. In the present study, accumulation has been quantified using several indicators to give a unified picture. The present work addresses the scaling of preferential accumulation with Reynolds number and suggests that while the spacing between particle clusters does exhibit a dependence on Reynolds number, the structure of particle clusters as viewed by individual particles shows little dependence on Reynolds number. The effect of adding a gravitational settling force on the particles has also been explored. While the gravity force tends to homogenize the particle distribution at low Stokes numbers, at high Stokes numbers it tends to arrange the originally random distribution into streaks in the direction of gravity. The ability of the Lorentz force to limit preferential accumulation has been the focus of the next part of the study. Charges are placed on particles to produce an electric field when the particles are inhomogeneously distributed. The electric field and thereby the Lorentz force tend to homogenize the particle distribution. It is interesting to note that the particle distribution attains a stationary state determined by the total amount of charge contained in the domain. It is demonstrated that in the presence of gravity, less amount of charge is required to homogenise particle distribution. Good agreement is observed for simulations of settling charged particles with experimental work. The modification of carrier phase turbulence by particles is studied formono-sized particles. The non-uniform modification of the fluid energy spectrum by particles has been demonstrated. It is seen that there is an increase in energy at high wave numbers for microparticles (St k
Author : Thomas Burgener
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (819 download)
Download or read book Particle Dispersion in Homogeneous Isotropic Turbulence written by Thomas Burgener and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jeng-Horng Chen
Publisher :
ISBN 13 :
Total Pages : 404 pages
Book Rating : 4.3/5 (91 download)
Download or read book Turbulence Generation in Homogeneous Dilute Particle-laden Flows written by Jeng-Horng Chen and published by . This book was released on 1999 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brett Kenneth Brunk
Publisher :
ISBN 13 :
Total Pages : 770 pages
Book Rating : 4.E/5 ( download)
Download or read book Turbulent Coagulation of Particles Smaller Than the Length Scales of Turbulence and Equilibrium Sorption of Phenanthrene to Clay written by Brett Kenneth Brunk and published by . This book was released on 1997 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pollutant and particle transport in estuaries is affected by a multitude of physical, chemical and biological processes. In this research the importance of equilibrium sorption and turbulent coagulation were studied. Sorption in estuaries was modeled using phenanthrene, bacterial extracellular polymer and kaolinite clay as surrogates for a hydrophobic organic pollutant, dissolved organic matter and inorganic suspended sediment, respectively. Experiments over a range of estuarine salinities showed that ionic strength had the largest effect on the extent of sorption, while the effect of extracellular polymer coatings on the mineral surfaces was insignificant. Further calculations using typical estuarine suspended sediment concentrations indicated that equilibrium sorption could not fully account for the solid-solution phase distribution of hydrophobic organic compounds in the estuarine water column. For particles that are small compared to the length scales of turbulence, the rate of coagulation is related to the dynamics of the smallest turbulent eddies since they have the highest shear rate. Experimental and theoretical effort focused on determining the coagulation rate of spherical particles in isotropic turbulence. A pair diffusion approximation valid for rapidly fluctuating flows was used to calculate the rate of coagulation in a randomly varying isotropic linear flow field.
Author : Richard J. Stenquist
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (31 download)
Download or read book Initial Mixing in Coagulation Processes written by Richard J. Stenquist and published by . This book was released on 1972 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael A. Delichatsios
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (192 download)
Download or read book Coagulation of Colloidal Particles in Turbulent Flows with Applications in Wastewater Treatment written by Michael A. Delichatsios and published by . This book was released on 1974 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. Elghobashi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book On the Two-way Interaction Between Homogeneous Turbulence and Dispersed Solid Particles written by S. Elghobashi and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Doychev, Todor
Publisher : KIT Scientific Publishing
ISBN 13 : 3731503077
Total Pages : 272 pages
Book Rating : 4.7/5 (315 download)
Download or read book The dynamics of finite-size settling particles written by Doychev, Todor and published by KIT Scientific Publishing. This book was released on 2015-01-27 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contributes to the fundamental understanding of the physical mechanisms that take place in pseudo turbulent particulate flows. In the present work we have considered the sedimentation of large numbers of spherical rigid particles in an initially quiescent flow field. We have performed direct numerical simulations employing an immersed boundary method for the representation of the fluid-solid interface. The results evidence that depending on the particle settling regime (i.e. Galileo number and particle-to-fluid density ratio) the particles may exhibit strong inhomogeneous spatial distribution. It is found that the particles are preferentially located in regions with downward fluid motion. The particles inside clusters experience larger settling velocities than the average. The flow in all flow cases is observed to exhibit characteristic features of pseudo-turbulence. The particle-induced flow field is further found to be highly anisotropic with dominant vertical components. The results indicate that, in the present flow configurations, the collective and mobility effects play significant role for the particle and fluid motion.
Author : Wontae Hwang
Publisher :
ISBN 13 :
Total Pages : 201 pages
Book Rating : 4.:/5 (786 download)
Download or read book Modification of Homogeneous and Isotropic Turbulence by Solid Particles written by Wontae Hwang and published by . This book was released on 2004 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jeffery S. Marshall
Publisher : Cambridge University Press
ISBN 13 : 1107032075
Total Pages : 361 pages
Book Rating : 4.1/5 (7 download)
Download or read book Adhesive Particle Flow written by Jeffery S. Marshall and published by Cambridge University Press. This book was released on 2014-03-31 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is targeted at professionals and graduate students working in disciplines where flow of adhesive particles plays a significant role.
