1# Library to Find Best eBook for Read
Author :
Release : 1993
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Predictive Modeling of Particle-laden Turbulent Flows by :
Download or read book Predictive Modeling of Particle-laden Turbulent Flows written by . This book was released on 1993. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Release : 1993
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
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 . This book was released on 1993. 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.
Author :
Release : 1992
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
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 . This book was released on 1992. 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.
Author : Shankar Subramaniam
Release : 2022-10-20
Genre : Science
Kind : eBook
Book Rating : 344/5 ( reviews)
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. This book was released on 2022-10-20. 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 :
Release : 1993
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
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 . This book was released on 1993. 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.
