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Numerical Simulation Of The Hydrodynamic Behavior Of A Gas Solid Fluidized Bed With And Without An Electric Field
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Book Synopsis Numerical Simulation of the Hydrodynamic Behavior of a Gas-solid Fluidized Bed with and Without an Electric Field by : Forhad Md Hossain
Download or read book Numerical Simulation of the Hydrodynamic Behavior of a Gas-solid Fluidized Bed with and Without an Electric Field written by Forhad Md Hossain and published by . This book was released on 1998 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Numerical Simulation of the Hydrodynamics of a Two-dimensional Gas-solid Fluidized Bed by New Finite Volume Based Finite Element Method by : Navid Famili Mohammad Hosein
Download or read book Numerical Simulation of the Hydrodynamics of a Two-dimensional Gas-solid Fluidized Bed by New Finite Volume Based Finite Element Method written by Navid Famili Mohammad Hosein and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2002 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of the Hydrodynamics of a Gas Fluidized Bed by : Jayanta Sanyal
Download or read book Numerical Simulation of the Hydrodynamics of a Gas Fluidized Bed written by Jayanta Sanyal and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A New Model for Two-dimensional Numerical Simulation of Pseudo-2D Gas-solids Fluidized Beds by :
Download or read book A New Model for Two-dimensional Numerical Simulation of Pseudo-2D Gas-solids Fluidized Beds written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Hydrodynamic Simulation of a Gas-liquid-solid Fluidized Bed by : Diana T. Matonis
Download or read book Hydrodynamic Simulation of a Gas-liquid-solid Fluidized Bed written by Diana T. Matonis and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Commencement by : Iowa State University
Download or read book Commencement written by Iowa State University and published by . This book was released on 1998 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Fluidized Bed Hydrodynamics and Heat Transfer by : Kodikal Nilesh Jayanth
Download or read book Numerical Simulation of Fluidized Bed Hydrodynamics and Heat Transfer written by Kodikal Nilesh Jayanth and published by . This book was released on 1999 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mathematical Modeling And Simulation In Hydrodynamic Stability by : Daniel N Riahi
Download or read book Mathematical Modeling And Simulation In Hydrodynamic Stability written by Daniel N Riahi and published by World Scientific. This book was released on 1996-02-29 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamic stability is of fundamental importance in the mechanics of fluids and is mainly concerned with the problem of the transition to turbulence. This book is devoted to publication of original research papers, research-expository and survey articles with an emphasis on unsolved problems and open questions in the mathematical modeling and computational aspects of hydrodynamic stability. Review chapters on the mathematical modeling and numerical simulation aspects of hydrodynamic stability, the physical background, and the limitations of the modeling and simulation procedures, due to particular mathematical or computational methods used, are included. This book will be appropriate for use in research and in research-related courses on the subject. It includes chapters on bifurcations in fluid systems, flow patterns, channel flows, non-parallel shear flows, thin-film flows, strong viscous shear flows, Gortler vortices, bifurcations in convection, wavy film flows and boundary layers.
Book Synopsis Visual Study of Hydrodynamics in a Two-dimensional Gas-solid Fluidized Bed by : Lisa Nalani Freeman
Download or read book Visual Study of Hydrodynamics in a Two-dimensional Gas-solid Fluidized Bed written by Lisa Nalani Freeman and published by . This book was released on 1992 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamic effects play important roles in fluidized bed combustion processes. Since the motion of "bubbles" is an important influence on fluidized bed heat transfer, a better understanding of their behavior is necessary for improving the design of fluidized bed boilers. Using a two-dimensional bed, silica sand particles were fluidized with air at room conditions. The bubbling bed was videotaped, and both qualitative and quantitative information were gathered. Bubble characteristics such as size, rise velocity and frequency were studied while particle size and superficial gas velocity were varied. Results were compared with some existing theories and other similar research. The effect of internal surfaces at several heights in the bed was also studied. General bubble behavior agreed well with descriptions from previous research, and the expected spherical-cap bubble shape was observed. Both bubble size and rise velocity increased with particle size and with fluid velocity. Bubble frequency increased with fluid velocity, but decreased with increasing particle size and height in the bed. These results agree with previous work done using optical probes to measure bubble characteristics. Comparisons of data with empirical models showed general agreement. The presence of internal surfaces had the effect of reducing the bubble size, rise velocity, and frequency, and also of reducing the influence of changing particle size and superficial velocity on the bed behavior.
Book Synopsis Hydrodynamics and Flow Structure, Gas and Solids Mixing Behavior, and Choking Phenomena in Gas-solid Fluidization by : Bing Du
Download or read book Hydrodynamics and Flow Structure, Gas and Solids Mixing Behavior, and Choking Phenomena in Gas-solid Fluidization written by Bing Du and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this study, the dynamic flow behavior and gas and solids mixing behavior in the turbulent fluidized beds are investigated by using Electrical Capacitance Tomography (ECT) technique and tracer technique. The ECT study reveals that the time-averaged solids holdup distribution exhibits radial symmetry in the turbulent regime. The addition of 10% fine particles decreases the solids concentration in the emulsion phase. The flow behavior in the turbulent fluidized beds is not appreciably affected by the temperature up to 400 oC. More than one spiral motion of bubble swarms is observed in the bubbling regime for the 0.3 m ID fluidized bed. The gas and solids mixing behavior varies significantly with the flow regimes. A small quantity of fine particles is noted to drastically affect the gas and solids mixing behavior in the turbulent fluidized bed. For Group A particles, the flow in the bed transits from the dilute regime to the turbulent regime when the gas velocity is below Utr or the solids circulation rate is lower than Gs, tr. Such flow transition can be signified as the choking transition. For Group B particles, choking is initiated by the formation of the square-nosed slugs (0.05 m ID column) or the wall slugs (0.1 m ID CFB) when the gas velocity is below Utr or the solids circulation rate is lower than Gs, tr. When the gas velocity is above Utr or the solids circulation rate is higher than Gs, tr, choking is characterized by the formation of open slugs. These regime transitions are characterized as the choking transition. A model based on the movement of the solids blob at the center of the bed is developed to predict the critical lifetime of a solids blob in a circulating fluidized bed. The criterion for the occurrence of choking transition in a circulating fluidized bed for both Group A and Group B particles is given.
Book Synopsis Numerical modeling of the hydrodynamics of gas fluidized beds by : Yusan Wang
Download or read book Numerical modeling of the hydrodynamics of gas fluidized beds written by Yusan Wang and published by . This book was released on 1988 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Effects of Liquid Injection on Hydrodynamic Behavior in Gas-Solid Fluidized Bed Under Elevated Pressure by : Raymond Lau
Download or read book Effects of Liquid Injection on Hydrodynamic Behavior in Gas-Solid Fluidized Bed Under Elevated Pressure written by Raymond Lau and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling and Numerical Simulation of Hydrodynamics in Pressurized Fluidized Beds by : Hans Löfstrand
Download or read book Modelling and Numerical Simulation of Hydrodynamics in Pressurized Fluidized Beds written by Hans Löfstrand and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies on the Stochastic Behavior of the Gas-solid Fluidized Bed by : Yee-Wei Huang
Download or read book Studies on the Stochastic Behavior of the Gas-solid Fluidized Bed written by Yee-Wei Huang and published by . This book was released on 1984 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of a Gas-solid Fluidized Bed at High Temperature in the Presence of Interparticles Forces by : Jaber Shabanian
Download or read book Hydrodynamics of a Gas-solid Fluidized Bed at High Temperature in the Presence of Interparticles Forces written by Jaber Shabanian and published by . This book was released on 2015 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to a lack of proper measurement techniques at elevated temperatures, we approached this study by dividing it into two parts. The first part was aimed at exploring the fluidization behavior of a gas-solid fluidized bed at different levels of IPFs from global and local points of view. The second part focused on the hydrodynamic characterization of a gas-solid fluidized bed at high temperature while different levels of IPFs were deliberately introduced into a bed of otherwise fresh coarse particles. (Abstract shortened by ProQuest.).
Book Synopsis Modelling and Numerical Simulation of Hydrodynamics in Pressurized Fluidized Beds by : Hans Enwald
Download or read book Modelling and Numerical Simulation of Hydrodynamics in Pressurized Fluidized Beds written by Hans Enwald and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
