Hydrodynamics, Mixing, Gas-liquid Mass Transfer, and Biological Applications of a Three-phase Fluidized Bed of Low Density Particles PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Hydrodynamics, Mixing, Gas-liquid Mass Transfer, and Biological Applications of a Three-phase Fluidized Bed of Low Density Particles PDF full book. Access full book title Hydrodynamics, Mixing, Gas-liquid Mass Transfer, and Biological Applications of a Three-phase Fluidized Bed of Low Density Particles by Wen-Tzung Tang. Download full books in PDF and EPUB format.
Author: Wen-Tzung Tang
Publisher:
ISBN:
Category :
Languages : en
Pages : 386
Get Book Here
Book Description
Author: Wen-Tzung Tang
Publisher:
ISBN:
Category :
Languages : en
Pages : 386
Get Book Here
Book Description
Author: Wai Man R. Lau
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages :
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The hydrodynamics of three-phase (gas-liquid-solid) fluidized beds has been studied in two columns with inside diameters of 7.62 and 15.2 cm respectively. The minimum gas and liquid velocities necessary to fluidize various types of solids were determined and correlated as a function of the particle size and density and the liquid viscosity; no effect of the initial bed height or column diameter was found. Overall phase holdups, or volume fractions, determined from a homogeneous bed model were combined with similar literature data to yield correlations for the overall gas and solid phase holdups. The overall gas holdup increased as the gas velocity was increased, while the overall solid holdup was decreased by increased liquid velocity and was increased by increased particle diameter or solid/liquid density difference. An electroconductivity technique was developed for use in the three-phase fluidized beds which allowed each of the phase holdups to be determined at any point in the column. The technique has shown the existence of a transition region as the bed goes from a three-phase to a two-phase system. The holdup profiles were fitted using the error function, and the mean and standard deviation of the solid holdup profile, along with the gas and solid holdups in the regions where they were constant, were measured for each set of run conditions. Use of these five parameters, which were correlated with the physical pxrameters of the systems studied, permits each of the three phase holdup profiles to be predicted. This gives the reactor designer more information concerning phase distributions than was available previously; thus it will aid in the design of reactors where local conditions throughout the bed must be considered.
Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 728
Get Book Here
Book Description
Author: H. Benkreira
Publisher: IChemE
ISBN: 9780852953761
Category : Science
Languages : en
Pages : 376
Get Book Here
Book Description
This work details the proceedings of the Fifth Conference on Fluid Mixing, held in Bradford in July 1996.
Author: Wen-Ching Yang
Publisher: CRC Press
ISBN: 0203912748
Category : Science
Languages : en
Pages : 876
Get Book Here
Book Description
This reference details particle characterization, dynamics, manufacturing, handling, and processing for the employment of multiphase reactors, as well as procedures in reactor scale-up and design for applications in the chemical, mineral, petroleum, power, cement and pharmaceuticals industries. The authors discuss flow through fixed beds, elutriation and entrainment, gas distributor and plenum design in fluidized beds, effect of internal tubes and baffles, general approaches to reactor design, applications for gasifiers and combustors, dilute phase pneumatic conveying, and applications for chemical production and processing. This is a valuable guide for chemists and engineers to use in their day-to-day work.
Author: M.F. Edwards
Publisher: Elsevier
ISBN: 1483136248
Category : Science
Languages : en
Pages : 213
Get Book Here
Book Description
Fluid Mixing II documents the proceedings of a symposium organized by the Yorkshire Branch and the Fluid Mixing Processes Subject Group of the Institution of Chemical Engineers and held at Bradford University, on 3-5 April 1984. The conference covers all aspects of mixing including the assessment of mixture quality, experimental and theoretical studies of mixing, chemical reaction and mass transfer, heat transfer, novel experimental techniques, scale-up and optimization. This volume contains 12 papers that deal with topics such as drawdown of floating solids into mechanically agitated vessels; effects of water/cement ratio, intensity of mixing, age and cement particle size and shape upon rheological properties of cement grouts with and without admixture; and mixing of non-absorbent solids with liquids. Other studies cover the flooding transition of a Rushton turbine operating in a gas-liquid system; power consumption in a three phase (liquid-solid-gas) mixing process in a stirred vessel; and an experimental technique for studying the rate of inter-zone mixing.
Author: Guangwen Xu
Publisher: Elsevier
ISBN: 0443187193
Category : Technology & Engineering
Languages : en
Pages : 409
Get Book Here
Book Description
Micro Fluidization: Fundamentals and Applications provides background and history on micro fluidized bed research and development, summarizes and analyzes the hydrodynamic characteristics of gas-solid micro fluidized beds, and delves into areas such as research results of delayed onsets of minimum, bubbling and slugging fluidization regimes, as well as of the advanced transitions to turbulent and fast fluidization regimes. Based on these results, the wall effects – the key mechanism resulting in the unique behavior of micro fluidization – are analyzed. Other sections discuss gas and solid mixing characteristics in terms of gas residence time distribution, gas backmixing, and solids mixing. Final sections focus on presentations of the so-called micro fluidized bed reaction analyzer (MFBRA) – a powerful tool for catalyst screening, process development, optimization of reaction parameters, studies of reaction mechanism and kinetics, among many other purposes. The book describes, in detail, the MFBRA's system design characteristics, analytic methodologies and various applications in thermochemical and catalytic reaction analysis. - Includes up-to-date information (all related research results and insights) on micro fluidized beds, including how they are comprehensively summarized and analyzed - Describes and explains the unique characteristics of micro fluidized beds - Covers the fundamental aspects and applications related to gas-solids, liquid-solids, and gas-liquid-solids micro fluidized beds - Provides up-to-date and potential applications of micro fluidized beds
Author: Akash N. Patwari
Publisher:
ISBN:
Category :
Languages : de
Pages : 107
Get Book Here
Book Description
Author: Ihab H. Farag
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 7
Get Book Here
Book Description
