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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 20 of 33 for “"Sand particles"”.
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Investigation of Erosion and Deposition of Sand Particles within a Pin Fin Array
… for erosion. Similarly, the higher Stokes number particles have more erosion potential while the lower Stokes number particles have a higher potential for erosion.
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Comparing Turbulent Dispersion Models for RANS Simulations of Particle-Laden Flows
The ingestion of sand-particles into turbomachinery decreases their longevity and perfor- mance and can even lead to failure. To address these problems, studying particle-laden flows is of high interest in the field. Due to their low computational cost, RANS simulations remain the preferred method …
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Particle breakage in sand blasting due to impact on ductile materials
… such applications are done by several processes. Sand blasting is one of them, where a stream of sand particles is forcefully projected onto a surface, with compressed air or steam. These sand particles break up into very small pieces upon impact, which are inhaled by workers to cause silicosis. …
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Modeling and Simulation of Bubbles and Particles
… of motion was applied to air bubbles and sand particles of several different diameters. Particle-fluid interactions observed through flow-visualization, particle concentration, particle-wall interactions, and Lagrangian statistics were all considered. These results were interpreted and …
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The Coefficient of Earth Pressure at Rest and Deformation and Densification of Granular Soils Subjected to Static and Dynamic Loading
… Lake Michigan Beach, Niigata, and Toyoura sand. Reconstituted dry sand specimens were subjected to 7 different loading histories, and the maximum effective vertical stress was 341 kPa. Different characteristics of dynamic vertical stresses, including periodic impulse stresses (f = 61 Hz, fp …
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A Computational Framework for Fluid-Thermal Coupling of Particle Deposits
… that models the coupled behavior between sand deposits and their surrounding fluid. Particle deposits that form in gas turbine engines and industrial burners, can change flow dynamics and heat transfer, leading to performance degradation and impacting durability. The proposed coupled …
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Kinetics and reactor design in the pyrolysis of tar sands
… thermal decomposition of bitumen from Utah tar sands was obtained and analysed with both isothermal and non-isothermal chemical reaction models. The use of a power rate law to describe the complex kinetics of pyrolysis gave agreement with the experimental data that was approximate, but adequate …
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Optimization of indentification of particle impacts using acoustic emission.
… in various industrial applications. Solid particles transported at severe operating conditions such as high-flow velocity can cause concerns for structural integrity, through wear originating from particle impacts with the structure. To apply Acoustic Emission (AE) in particle-impact …
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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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Sedimentology and Shallow Groundwater Responses of a Coastal Marsh Along a Salinity Gradient: A Case Study In Grand Bay National Estuarine Research Reserve, Mississippi
… increases seaward. The relative abundance of sand particles is a controlling factor for permeability in the clay and silt rich marsh sediments. Shallow groundwater levels fluctuate corresponding to diurnal tidal cycles, seasonal cycles, and short-term storm influences. Temperature and salinity …
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Resistance of a granular medium to normal impact of a rigid projectile
… projectiles into dry granular soil (Ottawa sand). Rigid projectiles were impacted into the soil at velocities less than 1000 ft/sec. Past theories for predicting penetration in soils have almost exclusively been based upon the impact velocity and the corresponding maximum penetration. In …
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Developing a novel mechanistic model for four-phase oil-water-gas-sand stratified flow in a horizontal pipe.
Presence of sand and solid particles in untreated petroleum sometime is inevitable. Although many techniques have been developed to prevent sand particles from entering the pipeline, such as downhole gravel packs, these downhole sand control devices can cause significant production loss due to the …
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Computational fluid dynamics modelling of multi-phase flow transition in presence of solid particles.
… contain mixtures of oil, gas and water with sand particles from sandstone reservoirs. Accurate design of oil and gas production equipment greatly depends on detailed understanding of this flow phenomena. Previously, multi-phase studies relied upon empirical correlation and mechanistic …
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Analysis and optimization of coalbed methane gas well production
… occurring phenomena, the amount of proppant sand used to hold fractures open within the well system after stimulation was shown to have the most impact During the well stimulation procedure, the proppant sand is carried into the fractures in the strata by a foam fracturing fluid. The sand …
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Interactions Between Supersonic Gas Jets and Gas-Solid Fluidized Beds
… fluidized beds for two applications: green sand reclamation and particle size control in fluid cokers. These two applications make use of the same attrition principles, and the main difference between them is that for green sand reclamation fragmentation is not desired, since its goal is …
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Evaluation and Enhancement of the Performance of Drop Inlets
… significant since large quantities of traction sand are routinely applied to this section of highway during winter storm events. This sand accumulates in DIs and may clog the outlet culvert piping because the configuration of the DI and the culvert piping does not allow an adequate scour …
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DETERMINATION OF THE SYNERGISM BETWEEN EROSION AND CORROSION IN POTASH-SAND SLURRY CORROSION OF CARBON STEEL
… Experiments were performed using saturated sand-potash slurries over a wide range of solids concentrations, velocities, and two particle sizes. A flow loop apparatus circulated the slurry through an AISI 1018 carbon steel elbow. An additional apparatus was developed to apply cathodic …
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Species and Cultural Management of Earthworms on Golf Course Turf in Arkansas and Oklahoma
… must be managed through cultural practices. Sand topdressing is one method of earthworm control studied for use on golf courses, with the supposition being that the abrasive sand particles will deter the soft-bodied earthworms from remaining in the system; however, effects have been varied. …
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Rheology of grout for preplaced aggregate concrete. Investigation on the effect of different materials on the rheology of Portland cement based grouts and their role in the production of preplaced aggregate concrete.
… and amount of powder materials, admixtures, sand and water content on the properties of fresh and hardened grout for the production of PAC have been investigated. Tests on hardened grout and PAC properties have also been carried out to investigate the most important effects. A correlation …
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Advanced Composites for Design and Rehabilitation of Hydraulic Structures
… and abrasive forces generated from barge and sand particles on tainter gates at Heflin Lock & Dam near Gainesville, Alabama. In this research, six different types of abrasion resistant coating materials/systems were applied on sand blasted metallic plates in order to perform comparative …
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