2 edition of Fluid dymanic characteristics of a magentically stabilized liquid-solid fluidized bed found in the catalog.
Fluid dymanic characteristics of a magentically stabilized liquid-solid fluidized bed
Written in English
|Statement||by Laure Honorez.|
|The Physical Object|
|Pagination||81 leaves, bound. :|
|Number of Pages||81|
In Fluid Coking TM, heavy oil is injected with a gas-atomization nozzle into a solid-gas fluidized bed of hot coke particles, where it cracks thermally. Improving the contact between injected liquid and fluidized particles boosts the yields of valuable products in these reactors by minimizing the formation of agglomerates (1). The liquid. An Experimental Study of Liquid-Solid Flow in a Circulating Fluidized Bed of Varying Liquid Viscosity. G. 1. S. Nirmala † and L. Muruganandam2 1Chemical Engineering Division, School of Mechanical and Building sciences VIT University, Vellore, India. 2. Chemical Engineering Division, School of Mechanical and Building sciences VIT.
ORIGINAL ARTICLE Solid holdup in liquid solid circulating ﬂuidized bed with viscous liquid medium Nirmala Gnanasundaram a,*, Muruganandam Loganathan a, Kumar Perumal b a Chemical Engineering Division, School of Mechanical and Building Sciences, VIT University, Vellore , India b Chemical Engineering Department, School of Engineering and Science, Curtin University of Technology, . In liquid-solid systems, if the flow rate is increased above the minimum fluidization velocity, it results in a smooth and progressive expansion of the bed. Such a bed is called a smoothly fluidized bed or homogeneously fluidized bed (Kunii et al, ).
A comprehensive two dimensional numerical model has been developed to simulate the biomass gasification in a fluidised bed reactor. Gas-solid flows as well as the chemical reactions are considered. Euler-Euler model is adopted to describe the multiphase flow regime inside the reactor. The standard k-є model is used to model the turbulence for each by: 3. Liquid-solid two-phase flow with heat transfer is directly simulated, to investigate the effects of the ratios of heat conductivities (solid to liquid) and bulk solid volume fraction from dense to dilute situations. The interaction between fluid and particles is solved by our original immersed solid approach on a rectangular grid system. A discrete element method with a soft-sphere collision Cited by: 9.
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Graduate Thesis Or Dissertation Fluid dymanic characteristics of a magentically stabilized liquid-solid fluidized bed Public Deposited. Analytics × Add to Cited by: 1. The bed-expansion characteristics of liquid–solid micro-fluidized beds were experimentally studied.
Bed columns with inner diameters of, and mm were fabricated based on capillaries. Five particle sizes in a range of 22–58 μm were investigated. Bed-expansion curves were plotted using visually recorded bed-expansion by: 4. A fluidized bed is a physical phenomenon occurring when a quantity of a solid particulate substance (usually present in a holding vessel) is placed under appropriate conditions to cause a solid/fluid mixture to behave as a is usually achieved by the introduction of pressurized fluid through the particulate medium.
This results in the medium then having many properties and. Of the various modelling tools, computational fluid dynamics (CFD) is the most promising for future fluidized bed modelling.
CFD is intended to include the key mechanisms of importance to predict accurate flow and other characteristics of fluidized beds for design, scale-up and by: Abstract: Gas -liquid solid fluidized bed technique has emerged recently as one of the most promising one for three phase operations involved in chemical, biochemical, petrochemical, pharmaceutical processing industries.
Out of the fundamental characteristics of a three-phase fluidized bed, the gas hold up and liquid hold upAuthor: S.N. Saha, G.P.
Dewangan, R. Gadhewal. Use of fluidized bed technology (details later in the course): a. Fluidized bed (catalytic) reactors b.
Ore roasting c. Fluidized bed combustion (for power generation) d. Drying of materials which are granular, free flowing, not agglomerating, not fragile, not vulnerable to File Size: 2MB. The bed transitions from a bubbling fluidized bed to a turbulent fluidized bed in which the gas voids are no longer regularly shaped bubbles, but rather have elongated shapes.
The top of the bed becomes less well defined due to the increase in entrained particles. At even higher gas velocities, all of the particles are entrained out of the bed.
Fundamentals of Fluidized-bed Chemical Processes presents a survey of the design, operation, and chemical processes of fluidized-bed reactors. The book is composed of five chapters. The first chapter examines the basic physics of gas-solid Edition: 1. At high enough velocities fluid drag plus buoyancy overcomes the gravity force and the bed expands.
Fluidized Bed. Low Velocity High Velocity Ap for Increasing u 0 Until onset of fluidization Ap increases, then becomes constant. Bed Length for Increasing u 0 L is constant until onset of fluidization and then begins to increase.
R Fluidized-Bed Reactors1 “When a man blames others for his failures, it’s a good idea to credit others with his successes.” –– Howard W. Newton The fluidized-bed reactor has the ability to process large volumes of fluid. For the catalytic cracking of petroleum File Size: KB. Fluidized Beds A fluidized bed is a packed bed through which fluid flows at such a high velocity that the bed is loosened and the particle-fluid mixture behaves as though it is a fluid.
Thus, when a bed of particles is fluidized, the entire bed can be transported like a fluid, if desired. Both gas and liquid. Mohammed Hydrodynamic Studies of Bed Expansion In Liquid Solid Fluidized Bed 0 1 2 3 0 10 20 30 40 50 Re p H 0 0% glycerol 10% glycerol 20% glycerol 30% glycerol Fig.2 Bed expansion of the bed as a function of Reynolds number.
Although Coulson et al.,provided I s 0. Holdup and Flow Behavior of Fluidized Solid Particles in a Liquid-Solid Circulating Fluidized Bed Korean Chem. Eng. Res., Vol. 52, No. 3, June, increasing liquid velocity. However, the decrease of particle holdup is not severe compared with that in the conventional liquid-solid fluidized beds , since the particles are circulated.
characteristics of liquid-solid fluidization of binary mixtures of size ratios ranging from to using sand of different sizes in tapered beds of apex angles 5 0, 10 0 and 15 0. (1) liquid–solid systems and (2) gas–solid systems. For liquid–solid systems, the hydrodynamic characteristics of fluidization of conical beds, i.e.
the fixed bed, partially fluidized bed and fully fluidized bed regimes, have been described by Kwauk  according to his theory of bubble less fluidization. The fluidization of particles in upwards and inverse Liquid-Solid Circulating Fluidized Bed is carried out to investigate the hydrodynamic characteristics when using “heavy” and “light” particles, whose densities are higher and lower than that of the surrounding liquid respectively.
Generally, the solids are fluidized upwards in the former case, whereas, the downwards fluidization is Cited by: 5. • The rate of heat transfer between a fluidized bed and an immersed object is high, hence heat exchangers within fluidized beds require relatively small surface areas.
Disadvantages of Fluidized Beds • The difficult-to-describe flow of gas, with its large deviation from plug flow and the bypassing of solids by bubbles, represents an. Abstract.
The random motion of mono-dispersed particles in a liquid fluidized bed was measured and processed from video recordings, using a refractive index matching method.
3D trajectories of coloured particles have been collected in a wide range of solid fraction, and statistical quantities have been derived in the range of high particle Reynolds number (O(10) Author: Alicia Aguilar-Corona, Olivier Masbernat, Roberto Zenit-Camacho, Bernardo Figueroa-Espinoza.
Although this method was developed for the scale-up of gas-solid fluidized beds, including bubbling beds and circulating fluidized beds [3, 53, 54], the same methodology can be extended to the liquid-solid fluidization, because of the similar governing mechanisms in fluid Cited by: 1.
Part 5 of the series Magnetic Field Assisted Fluidization is devoted to liquid-solid fluidized beds. The article is a systematic analysis of this branch of magnetically controlled fluidization Author: Jordan Hristov.
Semi-fluidized bed hydrodynamics, including minimum and maximum semi-fluidization velocities, packed bed formation and pressure drop across the bed, have been studied in a m ID liquid–solid.The performance of several important industrial processes, such as fluid coking or fluid catalytic cracking, is dependent on the good distribution of liquid feed sprayed into a fluidized bed of hot inert or catalytic particles, respectively.
Liquid injected into a fluidized bed is distributed in three different ways: (i) free moisture, or liquid coating individual particles; (ii) wet micro Cited by: 8.Index Terms— Fluidization, inclination, fluidized bed, flow regimes.
I. INTRODUCTION The unit operation in which solid particles exhibit a fluid like behavior by suspending in a fluid is known as fluidization. The fluidized beds have some unusual characteristics that led to their wide adaptability in industry.
The advantages include.