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Buoyancy considerations in a fluidized bed of ground particles
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Rao, Prakash R.. Buoyancy considerations in a fluidized bed of ground particles. Retrieved from https://doi.org/doi:10.7282/T35H7GF3

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TitleBuoyancy considerations in a fluidized bed of ground particles
NameRao, Prakash R. (author); Muller, Michael (chair); Cook-Chennault, Kimberly (internal member); Bagchi, Prosenjit (internal member); Rutgers University; Graduate School - New Brunswick
Date Created
Other Date2009-10 (degree)
SubjectMechanical and Aerospace Engineering, Fluidization, Fluid dynamics
Extentvi, 79 p. : ill.
DescriptionThe research conducted for this thesis determines and quantifies the forces acting on a large submerged object in a gas-solid fluidized bed of Geldart A ground particles at the onset of bubbling. In particular, the additional load from the previously reported de-fluidized region of particles found above submerged objects in fluidized beds is quantified. A force model was developed and comparisons between this and the experimental data yielded properties of the de-fluidized region, such as the shape and height of the hood, and the angle to which it rises. Drag is measured by comparing forces on objects of different geometries subject to the same conditions. Buoyancy was measured by summing the pressure force acting to push the submerged object out of the bed and the counteracting pressure force of the bed over the submerged object pushing it deeper into the bed. The de-fluidized region is found to have a significant impact on the buoyancy of the object by creating an additional weight force above the object thus increasing the pressure in this region. Explanations for the hood shape and size are made through phenomenological results obtained through visual observations. Particle transport through voidage collapses at the surface, i.e. “bubbling”, create a secondary particle circulation within the bed adding particles to the top of the hood. The size of the bubbles appears to determine the extent of the hood.
NoteM.S.
NoteIncludes bibliographical references (p. 78-79)
Noteby Prakash R. Rao
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T35H7GF3
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work
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