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Predictive Modeling Of Particle Laden Turbulent Flows Quarterly Progress Report No 3 April 1 To June 30 1993
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Book Synopsis Predictive Modeling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 3, April 1 to June 30, 1993 by :
Download or read book Predictive Modeling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 3, April 1 to June 30, 1993 written by and published by . This book was released on 1993 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Eulerian two-fluid mathematical model is considered for the flow prediction of gas-particle systems. The model expands on the Sinclair and Jackson model by recognizing a turbulent continuous phase. Both the gas- and the particle-phase velocity fields are composed of by a mean and a fluctuating component, and the important physical phenomena arising from the interaction of these components are included in the model. The gas turbulence is modeled by a single-phase closure, namely the k-{var_epsilon} low Reynolds model by Myong and Kasagi, modified to account for the presence of a dilute particle phase. The solid phase is considered as a rapid granular flow; hence, a closure based on the kinetic-theory analogy is used for the description of the stresses associated with this phase. Along with the relation between the fluxes of both phases and the pressure drop, the model is capable of predicting features related to the local flow structure, such as the mean and fluctuating velocity components and the concentration of both phases. In this report, the model is applied to the case of steady, fully developed flow in a vertical cylindrical pipe. An extensive comparison of the model predictions with experimental data is included. The sensitivity of the model predictions to the properties describing the particle collisions is also explored.
Book Synopsis Predictive Modelling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 2, January 1, 1993--March 31, 1993 by :
Download or read book Predictive Modelling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 2, January 1, 1993--March 31, 1993 written by and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The excellent comparison between the data of Bader et al (1988) and the predictions using the fully-developed flow model of Sinclair and Jackson (1989) have not yet been repeated with any other experimental data set for riser flow. This may be due to the fact that the data sets investigated thus far have reflected gas-solid flow in a developing state (low L/D ratios). In addition, the model of Sinclair and Jackson (1989) neglected gas phase turbulence which should have an effect on the solid concentration distribution. Hence, a dilute, particle-laden, turbulent flow model is developed here. Model predictions highlight the importance of an independent measurement of the specularity factor, an appropriate representation of the kinetic contribution to the total particle phase stress for very low solid loadings in confined flows, and a correct representation of the interaction between the fluctuating velocity components for the two phases.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predictive Modeling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 1, September 1--December 1, 1992 by :
Download or read book Predictive Modeling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 1, September 1--December 1, 1992 written by and published by . This book was released on 1992 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The successful prediction of particle-laden, turbulent flows relies heavily on the representation of turbulence in the gas phase. Several types of turbulence models for single-phase gas flow have been developed which compare reasonably well with experimental data. In the present work, a l̀̀ow-Reynolds̀̀ k-?, closure model is chosen to describe the Reynolds stresses associated with gas-phase turbulence. This closure scheme, which involves transport equations for the turbulent kinetic energy and its dissipation rate, is valid in the turbulent core as well as the viscous sublayer. Several versions of the low-Reynolds k-? closure are documented in the literature. However, even those models which are similar in theory often differ considerably in their quantitative and qualitative predictions, making the selection of such a model a difficult task. The purpose of this progress report is to document our findings on the performance of ten different versions of the low-Reynolds k-? model on predicting fully developed pipe flow. The predictions are compared with the experimental data of Schildknecht, et al. (1979). With the exception of the model put forth by Hoffman (1975), the predictions of all the closures show reasonable agreement for the mean velocity profile. However, important quantitative differences exist for the turbulent kinetic energy profile. In addition, the predicted eddy viscosity profile and the wall-region profile of the turbulent kinetic energy dissipation rate exhibit both quantitative and qualitative differences. An effort to extend the present comparisons to include experimental measurements of other researchers is recommended in order to further evaluate the performance of the models.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predictive Modeling of Particle-laden, Turbulent Flows by :
Download or read book Predictive Modeling of Particle-laden, Turbulent Flows written by and published by . This book was released on 1992 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The successful prediction of particle-laden, turbulent flows relies heavily on the representation of turbulence in the gas phase. Several types of turbulence models for single-phase gas flow have been developed which compare reasonably well with experimental data. In the present work, a low-Reynolds'' k-[epsilon], closure model is chosen to describe the Reynolds stresses associated with gas-phase turbulence. This closure scheme, which involves transport equations for the turbulent kinetic energy and its dissipation rate, is valid in the turbulent core as well as the viscous sublayer. Several versions of the low-Reynolds k-[epsilon] closure are documented in the literature. However, even those models which are similar in theory often differ considerably in their quantitative and qualitative predictions, making the selection of such a model a difficult task. The purpose of this progress report is to document our findings on the performance of ten different versions of the low-Reynolds k-[epsilon] model on predicting fully developed pipe flow. The predictions are compared with the experimental data of Schildknecht, et al. (1979). With the exception of the model put forth by Hoffman (1975), the predictions of all the closures show reasonable agreement for the mean velocity profile. However, important quantitative differences exist for the turbulent kinetic energy profile. In addition, the predicted eddy viscosity profile and the wall-region profile of the turbulent kinetic energy dissipation rate exhibit both quantitative and qualitative differences. An effort to extend the present comparisons to include experimental measurements of other researchers is recommended in order to further evaluate the performance of the models.
Book Synopsis Predictive Modeling of Particle-laden Turbulent Flows. Final Report by :
Download or read book Predictive Modeling of Particle-laden Turbulent Flows. Final Report written by and published by . This book was released on 1993 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earlier work of Sinclair and Jackson which treats the laminar flow of gas-solid suspensions is extended to model dilute turbulent flow. The random particle motion, often exceeding the turbulent fluctuations in the gas, is obtained using a model based on kinetic theory of granular materials. A two-equation low Reynolds number turbulence model is, modified to account for the presence of the dilute particle phase. Comparisons of the model predictions with available experimental data for the mean and fluctuating velocity profiles for both phases indicate that the resulting theory captures many of the flow features observed in the pneumatic transport of large particles. The model predictions did not manifest an extreme sensitivity to the degree of inelasticity in the particle-particle collisions for the range of solid loading ratios investigated.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994 with total page 712 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 3-D Turbulent Particle Dispersion Submodel Development. Quarterly Progress Report No. 2, 15 July--15 October 1991 by :
Download or read book 3-D Turbulent Particle Dispersion Submodel Development. Quarterly Progress Report No. 2, 15 July--15 October 1991 written by and published by . This book was released on 1991 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lack of a mathematical description of the interactions of fluid turbulence with other physics-chemical processes is a major obstacle in modeling many industrial program. Turbulent two-phase flow is a phenomenon that is of significant practical importance to coal combustion as well as other disciplines. The interactions of fluid turbulence with the particulate phase has yet to be accurately and efficiently modeled for these industrial applications. On 15 May 1991 work was initiated to cover four major tasks toward the development of a computational submodel for turbulent particle dispersion that would be applicable to coal combustion simulations. Those four tasks are: 1. A critical evaluation of the 2-D Lagrangian particle dispersion submodel, 2. Development of a 3-D submodel for turbulent particle dispersion, 3. Evaluation of the 3-D submodel for turbulent particle dispersion, 4. Exploration of extensions of the Lagrangian dispersion theory to other applications including chemistry-turbulence interactions.
Book Synopsis 3-D Turbulent Particle Dispersion Submodel Development. Quarterly Progress Report No. 4, January 15, 1992--April 15, 1992 by :
Download or read book 3-D Turbulent Particle Dispersion Submodel Development. Quarterly Progress Report No. 4, January 15, 1992--April 15, 1992 written by and published by . This book was released on 1994 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many practical combustion processes which use solid particles, liquid droplets, or slurries as fuels introduce these fuels into turbulent environments. Examples include spray combustion, pulverized coal and coal slurry combustion, fluidized beds, sorbent injection, and hazardous waste incineration. The interactions of the condensed phases with turbulent environments have not been well described. Such a description is complicated by the difficulty of describing turbulence in general, even in the absence of particles or droplets. But the complications in describing the dispersion and reaction of the condensed phases in turbulent environments do not stem entirely or even primarily from the uncertainties in the description of the turbulence. Theoretical descriptions of the turbulent dispersion of particles and droplets are not well established, even when the characteristics of the turbulence are known. It is the purpose of this project to develop two different particle dispersion submodels (one each for dilute and dense phases), and couple them with existing fluid-dynamic heat transfer and reaction chemistry models to provide computational simulations capable of addressing industrial problems.
Book Synopsis Direct Numerical Simulation of Particle Laden Turbulent Flows in the Particle-Lagrangian Reference Frame by : Aureen Cyr Currin
Download or read book Direct Numerical Simulation of Particle Laden Turbulent Flows in the Particle-Lagrangian Reference Frame written by Aureen Cyr Currin and published by . This book was released on 1997 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Perspectives in Turbulence by : L. Sirovich
Download or read book New Perspectives in Turbulence written by L. Sirovich and published by . This book was released on 1991 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration by : Jean-Pierre Minier
Download or read book Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration written by Jean-Pierre Minier and published by Springer. This book was released on 2018-06-12 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents an up-to-date review of turbulent two-phase flows with the dispersed phase, with an emphasis on the dynamics in the near-wall region. New insights to the flow physics are provided by direct numerical simuation and by fine experimental techniques. Also included are models of particle dynamics in wall-bounded turbulent flows, and a description of particle surface interactions including muti-layer deposition and re-suspension.
Book Synopsis Direct Numerical Simulation of Particle-laden Plane Strain Turbulent Flows by : Céline Barré
Download or read book Direct Numerical Simulation of Particle-laden Plane Strain Turbulent Flows written by Céline Barré and published by . This book was released on 1998 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroscopic Modelling of Turbulent Flows by : Olivier Pironneau
Download or read book Macroscopic Modelling of Turbulent Flows written by Olivier Pironneau and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
