Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 90 for “"Fluidization"”.
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Fluidization of nanoparticles
… phase. These processes are ideally suited to a fluidization process. However, in order to successfully use these applications, it is necessary to understand how nanoparticles can be fluidized. This dissertation demonstrates that the fluidization of nanoparticles is indeed possible and in fact, …
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Gas fluidization of nanoparticles
… to perform a systematic investigation on the gas fluidization of various nanoparticle agglomerates. Firstly, the gas fluidization characteristics and regime classifications without any additional external force fields are identified using both experimental measurements and modeling. Secondly, the …
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Enhanced fluidization of nanoparticle agglomerates
Gas fluidization of nanoparticle agglomerates has recently received much attention due to the excellent way in which these novel nanornaterials can be dispersed in a gaseous medium. Nanopowders have a very high surface area to volume ratio which allows them have unique chemical and physical …
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Jet assisted fluidization of nanoparticle agglomerates
Fluidization serves as a primary operation used to disperse, handle and process nanoparticles, but due to the complications involved with achieving homogenous fluidization of the agglomerates of nanoparticles, several methods have been developed to assist their conventional mode of fluidization. In …
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Water Based Soil Fluidization using a Soft Eversion Robot
… of underwater vine-like movement and soil fluidization, a process where granular materials are converted from a solid-like state to a fluid-like state, to create an underwater eversion robot capable of burrowing into sand. This was done with the goal of providing a future platform for …
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Fluidization and Segregation in Confluent Models for Biological Tissues
… collective behavior. I begin with the process of fluidization in ordered monolayers. By perturbing beyond the linear regime, I show that in confluent tissues the linear response does not correctly predict the non-linear behavior, which, in this case, is the ability to exchange neighbors and …
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Fluidization and soot filtration in a rotating fluidized bed
… necessitating an understanding of the nature of fluidization, particle mixing and filtration in the RFB. In an RFB, particles are subject to a centrifugal force which can be much larger than the force of gravity. Therefore the Geldart classification for conventional fluidized beds must be …
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Enhancement of fluidization and filtration using nanoparticle agglomerates and aerogels
Previous works have classified the fluidization behavior of nanoparticles as Agglomerate Particulate Fluidization (APF) and Agglomerate Bubbling Fluidization (ABE). These fluidization behaviors are quite different in regard to the fluidized bed expansion, the presence of bubbles and the smoothness …
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Impulsive fluidization of bi-disperse mixture in an expanding volume
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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The application of dimensional and statistical analysis to fluidization studies
… the fluidized system were studied. Copper fluidization columns were used having internal diameters of 2 and 4 inches. Standard testing grade of Ottawa sand were employed as the solid. The sand ranges studied were 20 to 30-, 30 to 50-, and 50 to 70-mesh (Tyler standard) with an absolute …
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Multiscale continuum simulations of fluidization : bubbles, mixing dynamics and reactor scaling
… scales. The thesis is focused on the bubbling fluidization of Geldart B particles (typically 103<Ar<105 and 100<Re<102) for application to biomass gasification reactors. 3D CFD simulations are conducted using the Two-Fluid framework, representing the solids phase as a continuum and optimally …
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Improvement of Fluidization Ability for Group A Powders by Fine Powder Additives
… in the industry because of the great quality of fluidization, which can be affected by the fine content. This project investigates the feasibility that employing the fine powders (≤ 20 μm) as additives to further improve the fluidization ability of Group A powders. Three additives, Coal-15, GB-6, …
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TWO-DIMENSIONAL FLUIDIZATION OF NANOMATERIALS VIA BIOMIMETIC MEMBRANES TOWARDS ASSISTED SELF-ASSEMBLY
<p>Materials that take advantage of the exceptional properties of nano-meter sized aggregates of atoms are poised to play an important role in future technologies. Prime examples for such nano-materials that have an extremely large surface to volume ratio and thus are physically determined by …
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Inverse solid-liquid fluidization of aerogel granules and its application in removing oil from water
Fluidization is a very well known unit operation used in the chemical industry for various purposes. Inverse solid-liquid fluidization, where the solid particles to be fluidized are less dense than the fluid, is one of the several different kinds of fluidization being studied for its potential in …
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Numerical Modeling and Prediction of Bubbling Fluidized Beds
… are used to determine pressure drop, minimum fluidization velocity and segregation for bubbling fluidized beds. The computational fluid dynamics (CFD) code Multiphase Flow with Interphase eXchange (MFIX) is used to study a two-stage reactor geometry with a binary mixture. MFIX is demonstrated …
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Exploring the timescale limitations of RoboClam : a biologically inspired burrowing robot
… movements of Ensis and has achieved localized fluidization in environments similar to that of the animal. This paper tests the theoretical timescale limits for running RoboClam while still achieving the soil fluidization that Ensis achieves. Needle valves were used on the robot's pneumatic …
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Some Aspects of the Performance of Rotating Fluidized Beds
… combustor and that most work had concentrated on fluidization conditions. This thesis describes investigations into the design, construction and operation of rotating fluidized bed combustors. Experiments to determine the fluidization and combustion characteristics were performed in which many …
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A comparison of the fluidized bed drying technique with conventional methods of drying tablet granulations
… engineering areas has become apparent.</p><p>Fluidization operations, although relatively unexplored in pharmacy, have been firmly established on a broad scale in other industries. Fluidization may be defined as the suspension and agitation of a bed of particulate solids by a vertically rising …
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PERFORMANCE ANALYSIS AND THE EFFECTS OF KEY PARAMETERS IN SOLID PARTICLE BEDS
… numerical models for determining minimum fluidization velocity (u_mf), the effects of the key parameters in bed optimization, the turbulence-like behavior initiating from three-dimensionality, quantification of bed performance, and jet-like patterns in uniform inflow. The Eulerian 2D model …
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