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Hydrodynamics And Flow Structure Gas And Solids Mixing Behavior And Choking Phenomena In Gas Solid Fluidization
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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 Hydrodynamics of Gas-solids Fluidization by : Nicholas P. Cheremisinoff
Download or read book Hydrodynamics of Gas-solids Fluidization written by Nicholas P. Cheremisinoff and published by Butterworth-Heinemann. This book was released on 1984 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas-Liquid-Solid Fluidization Engineering by : Liang-Shih Fan
Download or read book Gas-Liquid-Solid Fluidization Engineering written by Liang-Shih Fan and published by Butterworth-Heinemann. This book was released on 2013-10-22 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive mechanistic interpretation of the transport phenomena involved in various basic modes of gas-liquid-solid fluidization. These modes include, for example, those for three-phase fluidized beds, slurry columns, turbulent contact absorbers, and three-phase fluidized beds, slurry columns, turbulent contact absorbers, and three-phase transport. It summarizes the empirical correlations useful for predicting transport properties for each mode of of operation.Gas-Liquid-Solid Fluidization Engineering provides a comprehensive account of the state-of-the-art applications of the three-phase fluidization systems that are important in both small-and large-scale operations. These applications include fermentation,biological wastewater treatment, flue gas desulfurization and particulates removal, and resid hydrotreating. This book highlights the industrial implications of these applications. In addition, it discusses information gaps and future directions forresearch in this field.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of Gas-Solids Fluidization by : Nicholas P. Cheremisinoff
Download or read book Hydrodynamics of Gas-Solids Fluidization written by Nicholas P. Cheremisinoff and published by . This book was released on 1984-01-01 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics and Mass Transfer Studies in High Pressure Gas-liquid and Gas-liquid-solid Fluidization by : Wai Man R. Lau
Download or read book Hydrodynamics and Mass Transfer Studies in High Pressure Gas-liquid and Gas-liquid-solid Fluidization written by Wai Man R. Lau and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Slurry bubble columns and gas-solid fluidized bed reactors are some of the most commonly used industrial processes. Considerable interests have been recognized in the field of physical, chemical, petrochemical, electrochemical, and biochemical operations (Fan, 1989). In these reactor systems, large axial dispersion of phases and high flow patterns can be achieved by the excellent macromixing characteristics. It also provides excellent heat and mass transfer without the aid of external mechanisms and relatively easy operation. Despite the advantages of operations, the transport behavior in these systems is very complex and a comprehensive knowledge of the hydrodynamics, heat and mass transfer and mixing are required for successful application of these systems. Some aspects of the fundamental characteristics of evaporative liquid jets in gas-liquid-solid flows are studied and some pertinent literature is reviewed. It is found that the injection of an evaporative liquid jet decreases the minimum fluidization velocity at a high pressure due to the additional gas flow generated from liquid evaporation. Fluidizing gas velocities have no significant effect on the jet penetration length in a dense phase fluidized bed while it reduces the radial dispersed distance of the evaporative liquid. The tomographic images of liquid nitrogen injection in a dense phase fluidized bed indicate a distribution of reduced bubble sizes compared to a dry bed. The hydrodynamics, gas-liquid mass transfer properties and liquid entrainment phenomena in a high pressure and high temperature bubble column is investigated. Effects of pressure on hydrodynamics and mass transfer properties are mainly through the change in gas and liquid physical properties, which in turn changes the bubble dynamics that govern the transport phenomena. Experimental results show that liquid velocities have a direct influence on kl while other factors have a dominant effect on the interfacial area over kl. Liquid entrainment in bubble columns is controlled by the droplet formation during bubble bursting at interface. Effect of pressure on liquid entrainment is to due to the higher drag force exerted on the liquid droplet with higher gas density and the formation of smaller droplet by the smaller bubbles at high pressure.
Book Synopsis Directory of Graduate Research by : American Chemical Society. Committee on Professional Training
Download or read book Directory of Graduate Research written by American Chemical Society. Committee on Professional Training and published by . This book was released on 2005 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.
Download or read book 多相化学反应工程与工艺(上、下)(清华大学学术专著) written by and published by 清华大学出版社有限公司. This book was released on 2006 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: 本书介绍了流态化科学与工程方面的研究进展,与多相反应工程和工艺相关的粉体、造粒、绿色化工和生态工业等前沿领域的新内容和新进展,以及能源与环境等涉及可持续发展的战略问题。
Book Synopsis Hydrodynamics and Solids Mixing in Liquid-solid and Gas-liquid-solid Fluidized Beds by : Rong-Her Jean
Download or read book Hydrodynamics and Solids Mixing in Liquid-solid and Gas-liquid-solid Fluidized Beds written by Rong-Her Jean and published by . This book was released on 1985 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles of Gas-Solid Flows by : Liang-Shih Fan
Download or read book Principles of Gas-Solid Flows written by Liang-Shih Fan and published by Cambridge University Press. This book was released on 1998-01-13 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses fundamental principles of gas-solid flows and their applications, and includes numerous examples and homework problems.
Book Synopsis An Investigation on the Mixing Hydrodynamics of a Gas-solid Fluidized Bed by : Mario A. Ruvalcaba
Download or read book An Investigation on the Mixing Hydrodynamics of a Gas-solid Fluidized Bed written by Mario A. Ruvalcaba and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Fluidization written by M. Pell and published by Elsevier. This book was released on 2012-12-02 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a much-needed fluidization handbook for practising engineers. There are few plants which do not have a fluid bed process operating somewhere on the site, yet engineers rarely have any formal training in the subject. College courses often emphasize academic issues rather than industrial needs, and a study of the literature reveals an overwhelming abundance of correlations and experimental data.As this is a practical book, the author has minimized theoretical development of fundamental equations in favor of giving correlations which have been developed for large scale equipment. In some cases, where several correlations might apply, the author has chosen one or two which work best according to his own experience. Design procedures are described which should assist the designer and the operator of fluid beds to improve his process and to avoid some often-encountered pitfalls. The material will also be useful as a supplementary text to a course on fluidization, the emphasis on commercial design being a stimulating counterpoint to a strongly academic viewpoint.
Book Synopsis Fundamentals of Gas Particle Flow by : G Rudinger
Download or read book Fundamentals of Gas Particle Flow written by G Rudinger and published by Elsevier. This book was released on 2012-12-02 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Gas-Particle Flow is an edited, updated, and expanded version of a number of lectures presented on the “Gas-Solid Suspensions course organized by the von Karman Institute for Fluid Dynamics. Materials presented in this book are mostly analytical in nature, but some experimental techniques are included. The book focuses on relaxation processes, including the viscous drag of single particles, drag in gas-particles flow, gas-particle heat transfer, equilibrium, and frozen flow. It also discusses the dynamics of single particles, such as particles in an arbitrary flow, in a rotating gas, in a Prandtl-Meyer expansion, and in an oscillating flow. The remaining chapters of the book deal with the thermodynamics of gas-particle mixtures, steady flow through ducts, pressure waves, gas-particle jets, boundary layer, and momentum transfer. The experimental techniques included in this book present the powder feeders, the instrumentation on particle flow rate, velocity, concentration and temperature, and the measurement of the particle drag coefficient in a shock tube.
Book Synopsis Flowing Gas-solids Suspensions by : Roger G. Boothroyd
Download or read book Flowing Gas-solids Suspensions written by Roger G. Boothroyd and published by Chapman & Hall. This book was released on 1971 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Flow of Gas-solids Suspensions in Circulating Fluidized Beds by : Hong Cheng
Download or read book The Flow of Gas-solids Suspensions in Circulating Fluidized Beds written by Hong Cheng and published by . This book was released on 1993 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: CIRCULATING FLUIDIZED BED, SUPERFICIAL GAS VELOCITY, SOLIDS MASS FLUX, SOLIDS CONCENTRATION, SIMILAR PROFILE REGIME, OPTICAL FIBRE PROBE, DILUTE PHASE, L-VALVE, AERATION RATE, SOLIDS FLOW RATE.
Book Synopsis Gas-solids interactions in the distribution zone of a fluidized bed by : Donald J. Kirwan
Download or read book Gas-solids interactions in the distribution zone of a fluidized bed written by Donald J. Kirwan and published by . This book was released on 1981 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas (vapor) Liquid Systems by : N. N. Kulov
Download or read book Gas (vapor) Liquid Systems written by N. N. Kulov and published by Nova Publishers. This book was released on 1996 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas Vapor Liquid Systems
