AGGLOMERATION OF PARTICLES IN FLUIDIZED BEDS (LIQUID BRIDGES).
Item
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Title
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AGGLOMERATION OF PARTICLES IN FLUIDIZED BEDS (LIQUID BRIDGES).
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Identifier
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AAI8611367
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identifier
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8611367
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Creator
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MAZZONE, DOMINICK NICHOLAS.
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Contributor
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Gabriel I. Tardos
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Date
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1986
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Chemical
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Abstract
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An experimental and theoretical study of the agglomeration phenomenon which causes destabilization of certain low and high temperature fluidized beds was performed. A theoretical model was proposed to determine the conditions under which defluidization occurs in fluidized beds in which cohesion forces between granules arise due to the presence of sticky fluids and/or high temperatures. Bonding mechanisms between particles such as solid-liquid bridges, viscoelastic flattening and high temperature sintering were all considered. The model predicts breakup of aggregates by bubble motion and was compared to limiting fluidization-defluidization experiments performed by the author and others. An experimental method to measure surface softening of small particles heated to high temperatures was developed which consisted of using a dilatometer to measure the surface viscosity of the particles from rate of deformation data. Experimental methods to determine minimum sintering temperatures of a variety of granules were also presented. Lastly, experiments were performed to study the dynamic strength of two spheres coated with liquid moving away from one another. It was shown that the strength of the dynamic bridge was at least one order of magnitude greater than the corresponding strength of the static bridge between the two spheres.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Engineering
