A New Model For Two Dimensional Numerical Simulation Of Pseudo 2d Gas Solids Fluidized Beds PDF Download

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A New Model for Two-dimensional Numerical Simulation of Pseudo-2D Gas-solids Fluidized Beds

A New Model for Two-dimensional Numerical Simulation of Pseudo-2D Gas-solids Fluidized Beds
Author:
Publisher:
Total Pages:
Release: 2013
Genre:
ISBN:

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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.


Numerical Simulation of the Hydrodynamic Behavior of a Gas-solid Fluidized Bed with and Without an Electric Field

Numerical Simulation of the Hydrodynamic Behavior of a Gas-solid Fluidized Bed with and Without an Electric Field
Author: Forhad Md Hossain
Publisher:
Total Pages: 286
Release: 1998
Genre:
ISBN:

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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.


Modelling on Gas-solid Fluidization in Bubbling Fluidized Beds and Circulating Fluidized Beds

Modelling on Gas-solid Fluidization in Bubbling Fluidized Beds and Circulating Fluidized Beds
Author: Md. Mizanur Rahman
Publisher:
Total Pages: 8
Release: 1997
Genre:
ISBN:

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A fluidization model was developed by adopting the transport equations of the gas and solid phases and the constitutive relations for the solid phase derived by Ding [1]. Finite difference method was used for the numerical solution of the set of partial differential equations governing the gas solid two-phase flow. The develop model has the capability of treating a variety of boundary and initial conditions. The model was applied for the simulation of bubbling fluidization with a rectangular obstacle over a central jet and uniform gas distribution system a in a two-dimensional bed. The model was also applied for the computation of circulating fluidized (CFB) and to observe the effect of particle inelasticity on the hydrodynamics of CFB.


Role of Mathematical Modeling in Advanced Power Generation Systems

Role of Mathematical Modeling in Advanced Power Generation Systems
Author: Arijit Ganguli
Publisher: Frontiers Media SA
Total Pages: 153
Release: 2023-11-13
Genre: Technology & Engineering
ISBN: 2832538800

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Energy demands throughout the globe has been increasing and the detrimental effects of carbon emissions on the environment by use of non-renewable resources has impacted life on the planet. The changing climate has caused an increase in natural calamities all over the globe. Many countries in the world have started to produce power using renewable resources like solar, biomass, wind energy, nuclear energy and green fuels. Though there are several technologies for power generation using the above sources, efficient design of these systems still needs lot of research. Mathematical modeling would play a vital role in design of state of the art technologies. Advanced nuclear power plants need special mention since they involve naturally driven safety systems where the complex phenomena of boiling, condensation and thermal stratification take place. These are difficult to model as there is more than one phase coupled with turbulence models, near wall phenomena, coalescence and break up, etc. Scaling up of such systems and their innovative design to reduce stratification requires the help of mathematical modeling. Other opportunities include Computational Fluid Dynamics (CFD) modeling for design of wind turbines for power generation using wind energy. Power generation from biomass involves use of gasifiers which has complex set of reactions and mostly two or three phases which are difficult to model using CFD at industrial scales.


Multiphase Flow and Fluidization

Multiphase Flow and Fluidization
Author: Dimitri Gidaspow
Publisher: Elsevier
Total Pages: 489
Release: 2012-12-02
Genre: Science
ISBN: 0080512267

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Useful as a reference for engineers in industry and as an advanced level text for graduate engineering students, Multiphase Flow and Fluidization takes the reader beyond the theoretical to demonstrate how multiphase flow equations can be used to provide applied, practical, predictive solutions to industrial fluidization problems. Written to help advance progress in the emerging science of multiphase flow, this book begins with the development of the conservation laws and moves on through kinetic theory, clarifying many physical concepts (such as particulate viscosity and solids pressure) and introducing the new dependent variable--the volume fraction of the dispersed phase. Exercises at the end of each chapterare provided for further study and lead into applications not covered in the text itself. Treats fluidization as a branch of transport phenomena Demonstrates how to do transient, multidimensional simulation of multiphase processes The first book to apply kinetic theory to flow of particulates Is the only book to discuss numerical stability of multiphase equations and whether or not such equations are well-posed Explains the origin of bubbles and the concept of critical granular flow Presents clearly written exercises at the end of each chapter to facilitate understanding and further study


Granular Dynamics

Granular Dynamics
Author: Aibing Yu
Publisher: Springer
Total Pages: 500
Release: 2018-03-15
Genre: Science
ISBN: 9789812871398

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The aim of this handbook is to provide a comprehensive summary of the field of Particle Science and Technology which includes most updated research findings and their applications in different industries. It is hoped that the consolidated knowledge described by this handbook will inspire more innovative ideas to bring the field forward. The size of the particles may range from nanometer scale, as in pigments or aerosols, to that of mined or quarried materials. The handbook will cover the topics ranging from the formation and synthesis, packing and flow, and application of these particles. Each part is explored in great details in different sections and chapters, it is written by a pool of international well known scholars, as well as industrial experts. The handbook fully reflects the state of the art in Particle Science and Technology


Applied Mechanics Reviews

Applied Mechanics Reviews
Author:
Publisher:
Total Pages: 410
Release: 1989
Genre: Mechanics, Applied
ISBN:

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