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Author : J.-H. Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Interwake Turbulence Properties in Homogeneous Particle-laden Flows written by J.-H. Chen and published by . This book was released on 1999 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 : 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 : J.-H. Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Turbulence Generation in Homogeneous Particle-laden Flows written by J.-H. Chen and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kyungjin Lee
Publisher :
ISBN 13 :
Total Pages : 382 pages
Book Rating : 4.3/5 (91 download)
Download or read book Experimental Study of Particle-generated Turbulence in the Final Decay Period written by Kyungjin Lee and published by . This book was released on 2004 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Institute of Aeronautics and Astronautics
Publisher :
ISBN 13 :
Total Pages : 840 pages
Book Rating : 4.F/5 ( download)
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2003 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J.-H. Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Measurements and Predictions of Turbulence Generation in Homogeneous Particle-laden Flows written by J.-H. Chen and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 776 pages
Book Rating : 4.3/5 (243 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 2000 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John D. Schwarzkopf
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (318 download)
Download or read book Turbulence Modulation in Particle-laden Flows written by John D. Schwarzkopf and published by . This book was released on 2008 with total page 128 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 :
Publisher :
ISBN 13 :
Total Pages : 624 pages
Book Rating : 4.0/5 ( download)
Download or read book 40th AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2002 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1032 pages
Book Rating : 4.F/5 ( download)
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Aidan Stephen Cronin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book TURBULENCE MODULATION UNDER LARGE-PARTICLE LOADING written by Aidan Stephen Cronin and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle-laden turbulence is important to a diverse range of topics: from aerosol transport in the atmosphere to flocculation techniques treating our drinking water. Often the particles in flows of interest are large and non-spherical, making them difficult to study, and so simplified cases are considered to quantify turbulent behaviors. Experimental laboratory research has provided insight into the quantifiable behavior of these simplified particle-laden flows, notably in cases of homogeneous and isotropic (H.I) turbulence. For this research, we designed and constructed a novel laboratory turbulence tank for the study of particle-laden flows that could create a region of H.I turbulence at its center. To do so, we incorporated random, symmetric forcing on a completely new geometry (a modified icosahedron) intending to maintain the properties of H.I. turbulence while increasing the size of the region of the tank in which it is contained. This facility will provide a unique testbed for studies of particle-laden turbulence.
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 : Garrett Hayes Good
Publisher :
ISBN 13 :
Total Pages : 145 pages
Book Rating : 4.:/5 (913 download)
Download or read book Inertial Particles and Entrainment in Turbulent Flows written by Garrett Hayes Good and published by . This book was released on 2013 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work consists of three independent experimental studies. The first studies inhomogeneous turbulence with (even symmetric) non-Gaussian velocity probability density functions, created by partitioning an active grid in a wind tunnel. The turbulence is like that encountered in the environment (e.g., by wind turbines) or produced by fractal grids. The statistics of the turbulence are shown in particular to depend simply upon the spatial derivatives of the velocity r.m.s. field. The second study characterizes the intermittent nature of an inertial particle mixing layer, where a particle-laden flow entrains a particle-free flow. This is the case at the boundary of a cloud and affects its growth and hence climate modelling. The flow is accomplished with water droplets in a wind tunnel downstream of a splitter plate; the experiments are done for both homogeneous turbulence and where the active grid is partitioned to create an inhomogeneous interface like in the first study. We show the droplets to be entrained in intermittent, large-scale bursts, preserving the properties of the air and turbulence ambient to them, which in a cloud are critical to droplet growth. Gravitational settling effects are isolated by rotation of the apparatus. The third and final study takes a more fundamental look at inertial particles in isotropic conditions using both numerical simulations and water droplets in air turbulence from 32 loudspeaker jets aimed at a central point. Turbulent settling speeds, velocity variance and variance anisotropy are measured over an unprecedented parameter range, identifying all relevant parameterizations of particle inertia and buoyancy affecting their response to turbulence, with applications to all particle-carrying flows. The three mechanisms by which turbulence modifies settling speeds (as compared to in quiescent flow) are isolated for the first time, with vertical turbulent motions shown to be responsible for settling reductions and horizontal ones to be for enhancements. The three experiments rely on hot-wire anemometry, phase Doppler particle analysis (PDPA) and high-speed camera Lagrangian particle tracking techniques. The body of the text consists of three stand-alone papers. The dissertation work provides fundamental understanding for wide-ranging environmental and industrial engineering problems.
Author : 呂偉福
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.:/5 (71 download)
Download or read book Turbulence Modulation in Particle-Laden Flow with Mono-Dispersed Droplets written by 呂偉福 and published by . This book was released on 2010 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pierre Sagaut
Publisher :
ISBN 13 : 9783319731636
Total Pages : pages
Book Rating : 4.7/5 (316 download)
Download or read book Homogeneous Turbulence Dynamics written by Pierre Sagaut and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides state-of-the-art results and theories in homogeneous turbulence, including anisotropy and compressibility effects with extension to quantum turbulence, magneto-hydodynamic turbulence and turbulence in non-newtonian fluids. Each chapter is devoted to a given type of interaction (strain, rotation, shear, etc.), and presents and compares experimental data, numerical results, analysis of the Reynolds stress budget equations and advanced multipoint spectral theories. The role of both linear and non-linear mechanisms is emphasized. The link between the statistical properties and the dynamics of coherent structures is also addressed. Despite its restriction to homogeneous turbulence, the book is of interest to all people working in turbulence, since the basic physical mechanisms which are present in all turbulent flows are explained. The reader will find a unified presentation of the results and a clear presentation of existing controversies. Special attention is given to bridge the results obtained in different research communities. Mathematical tools and advanced physical models are detailed in dedicated chapters.
