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 13 of 13 for “"Bed expansion"”.
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The behaviour of freely bubbling fluidized beds
Gas fluidized beds have provided fascinating and infuriating problems for both the academic and industrial engineer. Although fluidization phenomena have been the subject of many hundreds of papers we still cannot dispense with experimentation in order to predict bed behaviour even for relatively …
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Bubble Dynamics and Dense Phase Composition in 2-D Binary Gas-Solid Fluidized Bed
Gas-solid bubbling fluidized bed with binary particles is a potential candidate for performing the dry coal beneficiation process due to its advantages such as the ability to adjust separation density and the elimination of process water. A two-dimensional (2D) fluidized bed was used to study …
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Bench-scale two-dimensional fluidized bed hydrodynamics and struvite growth studies
… rather independently of each other, before the bed expansion. It was suggested that bed height measurement could be another promising method to pinpoint minimum fluidization velocity as there is a sharp bed surface "waking episode" during the process of a packed bed being gradually fluidized. …
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Enhanced fluidization of nanoparticle agglomerates
… to the flow structure of the fluidized bed. A more viscous gas minimizes the size of bubbles, thereby extending the regime of homogeneous fluidization by suppressing the onset of the bubbling regime. Laser-based imaging and microscopy techniques were also used to study the agglomerate …
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Improvement of Fluidization Ability for Group A Powders by Fine Powder Additives
… The minimum fluidization velocity (Umf), bed expansion ratio (BER), and dense phase expansion ratio (DER) are tested to evaluate the quality of fluidization. Coal-15 can slightly improve the fluidization quality. High content of GB-6 can make the mixture obtain some characteristics of …
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Inverse solid-liquid fluidization of aerogel granules and its application in removing oil from water
… characteristics (minimum fluidization velocity, bed expansion and pressure drop) of an inverse fluidized bed of aerogel granules and using this system to remove oil from an oil-water mixture. The solid particles employed for this study are low density (100 kg/m^3) surface treated hydrophobic …
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Eulerian-Eulerian Modeling of Fluidized Beds
Fluidized bed reactor technology has been widely adopted within the industry as vital component for numerous manufacturing, power generation and gasification processes due to its enhanced mixing characteristics. Computational modeling of fluidized bed hydrodynamics is a significant challenge that …
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Bed dynamics and heat transfer in shallow vibrated particulate beds
A vibrated bed is a mobile layer of solid particles contained in a vessel that is vibrated vertically. This study investigates bed dynamics and heat transfer from a vertical surface in shallow vibrated beds in absence of aeration. In general, "shallow" means a depth-to-width ratio less than one. In …
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Numerical Simulation of Liquid-Solid Circulating Fluidized Beds
Liquid-solid circulating fluidized bed (LSCFB) reactors are obtaining extensive attraction in the extraction process of functional proteins from industrial broth. A typical LSCFB is comprised of a riser, a downcomer, a liquid-solid separator, a top solids-return pipe and a bottom solids-return pipe. …
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Enhancement of fluidization and filtration using nanoparticle agglomerates and aerogels
… are quite different in regard to the fluidized bed expansion, the presence of bubbles and the smoothness of the bed surface, with APF nanopowders showing a much more homogeneous fluidization and a much better dispersion than ABE nanopowders which are generally very difficult to fluidize and show …
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Shallow vibrated particulate beds - bed dynamics and heat transfer
Particulate beds which are mobilized and expanded by the application of mechanical vibrations are called vibrated beds. These beds are generally defined as shallow, if the depth-to-width ratio is less than unity. The dynamics of shallow vibrated beds and the heat transfer from immersed tubes to …
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Discrete Element Modeling of Granular Flows in Vibrationally-fluidized Beds
… to model granular flow in different vibratory beds, and the results were compared with experimental measurements of bulk flow velocity and bed expansion for the tub finisher. The sensitivity of the model predictions to the contact parameters was considered and the parameters were optimized with …
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Modeling the Hydrodynamics of a Fluidized Bed
… needs. Biomass hydrodynamics in a fluidized bed are extremely important to industries that are using biomass material in gasfication processes to yield high quality producer gas. However, biomass particles are typically difficult to fluidize due to their peculiar shape and a second inert …