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Showing 1 to 20 of 26 for “"Particle settling"”.
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An Analysis of Multiple Particle Settling for LMR Backup Shutdown Systems
Made available in DSpace on 2017-07-06T18:42:32Z (GMT). No. of bitstreams: 3 Brock_Richard_W_MS.pdf: 40782738 bytes, checksum: 5617f77bae0a8346e76d9f4196e7d93a (MD5) Brock_Richard_W_MS_ABS.pdf: 541598 bytes, checksum: 34fc07d7a58af0c820f0039e08f41c54 (MD5) license.txt: 4813 bytes, checksum: …
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Multiscale environmental flow dynamics: particle settling, turbulence modulation, and tornadic vortices
… a predictive, mechanistic description of how particles, non‑Newtonian carrier fluids, and coherent vortical structures interact across scales remains an open problem. This dissertation addresses key gaps through three interrelated laboratory investigations. The first study examines the …
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Experimental and Analytical Study on the Particulate Entrainment and Dispersion From a Porous Emission Source in Wind
… experiment are smoke, magnesia, latex, and glass particles. The scaling results based on the measured data indicate that the effect of particle settling due to gravity force will be significant when the particle settling velocity is greater than 0.03 m/s.
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Primary sedimentation tank model with characterized settling velocity groups
… the separation of solids and liquid in primary settling tanks (PSTs) of wastewater treatment systems. These physical processes are described by various settling conditions such as discrete and flocculent settling, along with other phenomena such as flocculation, coagulation, ammonification or …
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Investigating the use of sodium metasilicate to improve the flotation performance of altered PGE ores
… recoveries. This was supported by slower particle settling rates at high sodium metasilicate dosages during particle settling measurements. Talc micro-flotation tests revealed that the depression of talc occurred at higher sodium metasilicate dosages, which improved concentrate grade. This …
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The underwater separation of diamantiferous marine gravels
… diamond-bearing gravel, using their varying particle settling velocities in an upward flowing fluid. The cyclosieve and spirosieve are two other choices that both use rotational flow to create a centrifugal force, which forces the gravel onto a screening surface. The test work carried out …
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Application of Laser-Doppler Velocimetry to the Study of Coagulation and Sedimentation
… relative stability of dilute polystyrene latex particle (0.198 (mu)m diameter) suspensions was determined by comparing floc settling velocities. These suspensions are found to be stabilized in basic pH; the addition of sodium dodecyl sulfate (SDS) is insufficient to prevent coagulation of …
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Simulation of filtration for suspension transport in porous media
… a novel method for analyzing the filtration of particles transported through a granular porous medium. The proposed analysis considers the deposition of particles through discrete simulations of particle-laden flow in a cylindrical model pore. The pore model assumes that particles collect, mound …
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Direct Simulations of Fluid-Particle Flow in Newtonian and non-Newtonian Fluids Using Coupled Lattice Boltzmann and Discrete Element Methods
… are employed to investigate a suite of fluid-particle flow problems in both Newtonian and non-Newtonian fluids. First, the rheological properties of finer particle suspensions in a Newtonian fluid are investigated, as the particle shape and solid fraction vary. An increase of the relative …
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Sedimentation in a stratified ambient
We study the interaction between settling particles and a stratified ambient in a variety of contexts. We first study the generation of large scale fluid motions by the localised release of a finite mass of particles in the form of plumes or gravity currents. We present the results of a combined …
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Intrusion dynamics of small oil droplets from a deep ocean blowout
… towed in a salt-stratified tank. Non-dimensional particle slip velocity UN ranged from 0.1 to 1.9. While particles of all sizes were affected by the stratification, only those with UN less or equal to 0.5 were observed to enter the intrusion layer. The spatial distributions of beads, collected on …
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Water Treatment: Fundamentals and Practical Implications of Bubble Formation
… conventional treatment, including impaired particle settling, filter air binding, and measurement as false turbidity in filter effluent. Coagulation processes can cause supersaturation and bubble formation by converting bicarbonate alkalinity to carbon dioxide by acidification. A model was …
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Metal sludge thickening characteristics: particle density considerations
… his equation for drag force on a uniform sphere settling in a liquid, researchers have searched for a modification of this equation that would predict particle settling behavior in concentrated suspensions such as sludges. During the 1960’s, researchers such as Michaels and Bolger (1962) and …
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Experimental and Analytical Investigation of Particle Dynamics in Newtonian and non-Newtonian Fluids in a Taylor-Couette Cell
<p>This doctoral dissertation investigates heavy particle sedimentation in Newtonian and non-Newtonian fluids, aiming to understand their behavior in Drilling Fluid (DF) systems used in oil and gas industry, where such phenomenon can lead to operational issues such as lost circulation, well control …
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Determining the Viability of Recent Storms as Modern Analogues for North-Central Gulf of Mexico Paleotempestology Through Sedimentary Analysis and Storm Surge Reconstruction
… systems as a function of transport distance, particle settling velocity, and gravitational acceleration. We collected cores in a pond (3) and adjacent beach (1) in Hancock County, Mississippi. Loss-on-ignition and grain-size analyses were conducted on cores in the context of a Bayesian …
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Evaluation of Hydraulic Separator Applications in the Coal and Mineral Industries
… separators, these units make use of differential particle settling rates to segregate particles according to shape, size, and/or density. As with any equipment, there are inefficiencies associated with its operation, which prompted an industry driven research program to further evaluate two novel …
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Dynamics of particle clouds in ambient currents with application to open-water sediment disposal
… of sediment, which requires knowledge of how particle clouds behave in ambient currents. Flow visualization experiments were performed in a glass-walled recirculating water channel to model open-water sediment disposal by releasing particles quasi-instantaneously into the channel with ambient …
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Multiphase Fountains
… than on the motion of individual bubbles or particles. In chapters 2 and 3 we consider unconfined bubble fountains. We begin by investigating the maximum depth reached by bubbles in turbulent water jets issuing downwards into a reservoir. We compare the experimental data with a theoretical …
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Feedbacks between plants, flow, and particle fate
Environmental flows carry a wide variety of particles that interact with vegetation. Vegetated canopies are anchored by sediment, release pollen and seeds to colonize new ground, rely on nutrients carried by sediment, and may be killed by disease spores. While the influence of vegetation on flow …
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Evaluation of a data-driven primary sedimentation tank model using settleometer data
Data-driven primary sedimentation (or settling) tank (DDPST) model was recently developed to improve the existing primary sedimentation (or settling) tank (PST) models which are largely total suspended solids (TSS) based. The purpose of the DDPST model is to realistically simulate the full-scale …
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