Particle Coagulation In Homogeneous Turbulence
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Particle Coagulation In Homogeneous Turbulence
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Author : S. Balachandar
language : en
Publisher:
Release Date : 1988
Particle Coagulation In Homogeneous Turbulence written by S. Balachandar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Coagulation In Turbulent Flow Theory And Experiment
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Author : Michael A. Delichatsios
language : en
Publisher:
Release Date : 1974
Coagulation In Turbulent Flow Theory And Experiment written by Michael A. Delichatsios and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Coagulation categories.
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).
Particle Coagulation In A Turbulent Plume
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Author : Hoi-Ying Ng Holman
language : en
Publisher:
Release Date : 1986
Particle Coagulation In A Turbulent Plume written by Hoi-Ying Ng Holman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Coagulation categories.
The Interaction Of Particles With Homogeneous Turbulence
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Author : Kyle David Squires
language : en
Publisher:
Release Date : 1990
The Interaction Of Particles With Homogeneous Turbulence written by Kyle David Squires and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Initial Mixing In Coagulation Processes
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Author : Richard J. Stenquist
language : en
Publisher:
Release Date : 1972
Initial Mixing In Coagulation Processes written by Richard J. Stenquist and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Mixing categories.
Particles In Turbulent Flows
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Author : Leonid I. Zaichik
language : en
Publisher: John Wiley & Sons
Release Date : 2008-12-04
Particles In Turbulent Flows written by Leonid I. Zaichik and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-12-04 with Science categories.
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.
Coagulation Of Colloidal Particles In Turbulent Flows With Applications In Wastewater Treatment
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Author : Michael A. Delichatsios
language : en
Publisher:
Release Date : 1974
Coagulation Of Colloidal Particles In Turbulent Flows With Applications In Wastewater Treatment written by Michael A. Delichatsios and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Coagulation categories.
Relative Motion And Coagulation Of Particles In A Turbulent Gas
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Author : I. O. Huebsch
language : en
Publisher:
Release Date : 1967
Relative Motion And Coagulation Of Particles In A Turbulent Gas written by I. O. Huebsch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
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).
Particle Dispersion In Homogeneous Isotropic Turbulence
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Author : Thomas Burgener
language : en
Publisher:
Release Date : 2012
Particle Dispersion In Homogeneous Isotropic Turbulence written by Thomas Burgener and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence
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Author : Aditya U. Karnik
language : en
Publisher:
Release Date : 2012
Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence written by Aditya U. Karnik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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
