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 “"glass spheres"”.
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Behavior of low-frequency sound waves in porous media
… gravel, large and small sifted pea gravels, and glass spheres. A standing wave curve fitting algorithm was applied to data taken from a vertical impedance tube to determine the propagation and reflection parameters of the materials. Physical characteristics considered include porosity, …
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Studies in vibrofluidized beds and synthesis of silica catalysts
… beds of Master Beads (spherical alumina) and glass spheres was studied. Solid piles were observed to form at specific bed locations. Solid-circulation paths were directed from the shallowest toward the deepest region of the vibrated bed. For beds in which the solid pile formed above the …
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Bioremediation of ethanol in air using a gas-fluidized bioreactor
… to the poor fluidization properties of sawdust, glass spheres were added. A mixture of sawdust and glass spheres remained well mixed during fluidization. In the mixture, interparticle forces increased with increasing moisture in the sawdust, eventually causing defluidization of the bed. In the …
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Mechanics of Liquid Transport and Swelling in Porous Media
… cellulose foam and in a dense random packing of glass spheres are studied in this thesis. Specifically, the capillary and diffusion mechanisms are investigated by critical experiments, and appropriate theoretical models are developed for both porous media. Finally, a coupled diffusion-actuation …
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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… vessels were: 52 mm in diameter using 5 mm glass spheres in the upflow bed at 8 bara, 27 mm with 5 mm glass spheres in the trickle bed at 6.75 bara, and 52 mm using 1.2 mm poppy seeds as the fluidised particles at 8.5 bara. The experiments were conducted at a laboratory temperature of 25.0 ± …
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Visualization of Near-Surface Flow Patterns for Air-Water Gas Transfer
… convergence is observed. Experiments with glass spheres (d = 70 μm-2 mm, Sc → ∞) were conducted for further comparison. Tracking of individual particles allows for a precise measurements of the surface velocity and investigations of the local momentum transfer.
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Toughening mechanisms in polypropylene filled with rigid particles
… of composites of isotactic polypropylene and glass spheres.
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Studies of the Coalescence of Dispersions in Particulate Packings
… inlet dispersion with a packing of equal sized glass spheres. Four systems were studied and a correlation was developed using a dimensional analysis to evaluate the parameters affecting the exit drop size of a packed bed. A technique was developed to evaluate the mean exit drop size by producing …
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Ultrasound propagation in colloidal dispersions
… of a[alpha] and c for model dispersions of glass spheres in Newtonian Iiquids are shown to be in good agreement with the relevant theory when particle polydispersity is taken into account. For structured fluids as the continuous phase, the a[alpha] and c data for suspensions of spheres are …
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Microplastic deformation of polycrystalline silver chloride containing a small volume fraction of hard inclusions
… (CuC1) and 0.01 volume percent of 1 to 5 micron glass spheres and particles. After rolling, recrystallizing and tensile testing, composite samples are exposed to UV light. This "decorates" dislocations in the top 40 microns of a sample with metallic silver so they can be seen with an optical …
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Investigating multi-directional inhomogeneous granular suspensions
… approximation in DEM, used 10 mm diameter glass spheres and glycerol/water mixtures in a drum. The second configuration was simulated with DEM using the Hertz-Mindlen contact model for particle-particle interactions. The effect of a viscous force between particles in close proximity to each …
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Discrete Element Modeling of Granular Flows in Vibrationally-fluidized Beds
… and growth of circulation in beds of steel and glass spheres as a function of bed depth, inter-particle and wall friction coefficients, and the amplitude of vibration. While the values from the DEM showed an error of up to 50% in the predicted circulation strength, depending on the type of the …