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| Author | : Navid Famili Mohammad Hosein |
| Publisher | : |
| Total Pages | : |
| Release | : 2006 |
| Genre | : Chemical engineering |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2013 |
| Genre | : |
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Pseudo-two dimensional (pseudo-2D) fluidized beds, for which the thickness of the system is much smaller than the other two dimensions, is widely used to perform fundamental studies on bubble behavior, solids mixing, or clustering phenomenon in different gas-solids fluidization systems. The abundant data from such experimental systems are very useful for numerical model development and validation. However, it has been reported that two-dimensional (2D) computational fluid dynamic (CFD) simulations of pseudo-2D gas-solids fluidized beds usually predict poor quantitative agreement with the experimental data, especially for the solids velocity field. In this paper, a new model is proposed to improve the 2D numerical simulations of pseudo-2D gas-solids fluidized beds by properly accounting for the frictional effect of the front and back walls. Two previously reported pseudo-2D experimental systems were simulated with this model. Compared to the traditional 2D simulations, significant improvements in the numerical predictions have been observed and the predicted results are in better agreement with the available experimental data.
| Author | : Baru Debtera |
| Publisher | : GRIN Verlag |
| Total Pages | : 26 |
| Release | : 2021-11-29 |
| Genre | : Science |
| ISBN | : 3346547728 |
Academic Paper from the year 2021 in the subject Physics - Mechanics, , language: English, abstract: In this study, numerical simulations of a gas-solid fluidized bed reactor involving a two-fluid Eulerian multiphase model and incorporating the Kinetic Theory of Granular Flow (KTGF) for the solids phase have been performed using a commercial Computational Fluid Dynamics (CFD) software. The fluidized bed setup consists of 1,5 m height and 0,2 m diameter in which a series of experiments were performed using Helium tracer to determine the Residence Time Distribution (RTD) at various normalized velocities i.e., with different degrees of gas-solids mixing. Both 2D and 3D simulations of the fluidized bed reactor are performed. The main purpose of this study is to understand the hydrodynamic behavior of a gas-solid fluidized bed reactor through a framework of Eulerian multiphase model and to analyze hydrodynamic behavior of the gas-solids mixing.
| Author | : Forhad Md Hossain |
| Publisher | : |
| Total Pages | : 286 |
| Release | : 1998 |
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The objective of this investigation is to numerically predict the effect of an electric field on a two-dimensional gas-solid fluidized bed. The particles in the bed are taken to be of a uniform size and density forming the particulate phase with a gas (air) taken as the continuum phase. A hydrodynamic model of fluidization utilizes the principles of conservation of mass and momentum describing the multiphase flow equations along with the constitutive equations of gas-solid drag and solids stress. A two-dimensional unsteady-state computer code (K-Fix) was used to observe the effect of an electric field on the gas and solid velocities and the void fraction and pressure in the bed. Special case studies included that of a jet, a bubble, and two bubbles, with and without an electric field.
| Author | : Robert C. MacArthur |
| Publisher | : |
| Total Pages | : 300 |
| Release | : 1982 |
| Genre | : Fluid dynamics |
| ISBN | : |
| Author | : Jiyuan Tu |
| Publisher | : Butterworth-Heinemann |
| Total Pages | : 457 |
| Release | : 2012-11-27 |
| Genre | : Science |
| ISBN | : 0080982778 |
Computational Fluid Dynamics, Second Edition, provides an introduction to CFD fundamentals that focuses on the use of commercial CFD software to solve engineering problems. This new edition provides expanded coverage of CFD techniques including discretisation via finite element and spectral element as well as finite difference and finite volume methods and multigrid method. There is additional coverage of high-pressure fluid dynamics and meshless approach to provide a broader overview of the application areas where CFD can be used. The book combines an appropriate level of mathematical background, worked examples, computer screen shots, and step-by-step processes, walking students through modeling and computing as well as interpretation of CFD results. It is ideal for senior level undergraduate and graduate students of mechanical, aerospace, civil, chemical, environmental and marine engineering. It can also help beginner users of commercial CFD software tools (including CFX and FLUENT). A more comprehensive coverage of CFD techniques including discretisation via finite element and spectral element as well as finite difference and finite volume methods and multigrid method Coverage of different approaches to CFD grid generation in order to closely match how CFD meshing is being used in industry Additional coverage of high-pressure fluid dynamics and meshless approach to provide a broader overview of the application areas where CFD can be used 20% new content
| Author | : Yusan Wang |
| Publisher | : |
| Total Pages | : 187 |
| Release | : 1988 |
| Genre | : Gas dynamics |
| ISBN | : |
This research involves a numerical study of the hydrodynamics of gas fluidized beds. We use the continuum model, treating both gas and particles as interpenetrating continua. The motion of gas and particles is strongly coupled by the interactions between them. For simplicity, we only consider drag forces. We use MacCormack's numerical method to solve the hyperbolic like equations and successive error vector propagation method or a marching tridiagonal method to solve the elliptic equation for pressure, depending on the situation considered (i.e. boundary conditions and geometry). In order to understand the basic phenomena, we consider the propagation of a finite disturbance of sine wave shape in one dimension. The disturbance grows in amplitude and forms a voidage shock. Next, the two dimensional case is analyzed, starting from the uniform fluidization condition. A jet is introduced at the bottom and the formation of a bubble and its motion is observed. Additionally, we introduce a bubble inside the bed and observe its effect on bed hydrodynamics. We then calculate the rise velocity of the bubble and find that it compares well with empirical correlations. We also consider the two dimensional case with a rectangular obstacle. The initial condition is calculated using D'Arcy's law. We observe the particle packing on the top and the local expansion phenomenon under the obstacle as well as the interaction of a rising bubble. The numerical results for this case agree qualitatively with experimental observations reported by others.
| Author | : Alexander Agung |
| Publisher | : IOS Press |
| Total Pages | : 188 |
| Release | : 2007 |
| Genre | : Science |
| ISBN | : 9781586037598 |
The evolutionary design comprises gradual development and improvements of the power plant to be deployed in future based upon the results of operational records and the implementation of the defense-in-depth and the probabilistic safety analysis. This title focuses on passive safety features and intensive means to prevent core damage.
| Author | : |
| Publisher | : |
| Total Pages | : 702 |
| Release | : 1995 |
| Genre | : Aeronautics |
| ISBN | : |
| Author | : Hassan Khawaja |
| Publisher | : Academic Press |
| Total Pages | : 382 |
| Release | : 2020-04-01 |
| Genre | : Science |
| ISBN | : 0128183454 |
Multiphysics Modelling of Fluid-Particulate Systems provides an explanation of how to model fluid-particulate systems using Eulerian and Lagrangian methods. The computational cost and relative merits of the different methods are compared, with recommendations on where and how to apply them provided. The science underlying the fluid-particulate phenomena involves computational fluid dynamics (for liquids and gases), computational particle dynamics (solids), and mass and heat transfer. In order to simulate these systems, it is essential to model the interactions between phases and the fluids and particles themselves. This book details instructions for several numerical methods of dealing with this complex problem. This book is essential reading for researchers from all backgrounds interested in multiphase flows or fluid-solid modeling, as well as engineers working on related problems in chemical engineering, food science, process engineering, geophysics or metallurgical processing. Provides detailed coverage of Resolved and Unresolved Computational Fluid Dynamics - Discrete Element Method (CFD-DEM), Smoothed Particle Hydrodynamics, and their various attributes Gives an excellent summary of a range of simulation techniques and provides numerical examples Starts with a broad introduction to fluid-particulate systems to help readers from a range of disciplines grasp fundamental principles
