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 11 of 11 for “"particle detachment"”.
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Force and Energy Measurement of Bubble-Particle Detachment
… for increasing the upper limit of floatable particle sizs in the froth flotation process have been examined since the early beginnings of mineral flotation. The economic implications of such an incresae are far ranging; from decreased grinding costs and increased recoveries to simplified …
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Particle Detachment in Single-Phase and Two-Phase Flows in Porous Media
… This thesis shows that the commonly used single particle-single surface Derjaguin-Landau-Verwey-Overbeek (DLVO) calculations do not always effectively predict particle detachment. Therefore, the mobilisation of clustered structures under particle-particle attraction is investigated. The critical …
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Turbulence-particle interactions on surfaces
The physics of adhesion and detachment of particles in ventilation ducts is important to understand and control contaminant and pathogen dispersal indoors. This thesis presents an experimental characterization of parameters which affect the resuspension of settled micro-particles and spores in a …
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Optimum Processing of 1 mm by Zero Coal
Coal in the finer particle size ranges (below 1 mm) has always suffered from poor cleaning efficiencies. This problem has been exacerbated in recent years with the increased amount of high ash fines due to continuous mining machines and the mining of dirtier coal seams. In the present work, it is …
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Development of a turbulent flotation model from first principles
… (pulp), so that bubbles coated with hydrophobic particles rise to the top and form a froth phase while hydrophobic particles stay in suspension. The selectivity of the flotation process is determined by the hydrophobicity of the particulate materials involved, while the kinetics of the process is …
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A Simple Computational Model for Particle Resuspension Behind a Normal Moving Shock
The simulation of particle resuspension from a surface due to shock passage and subsequent piston flow presents a means to analyze the post-shock conditions of an environment, such as after a dirty' bomb is detonated. This computational model is based on the 'Rock'n Roll' models of particle …
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The effect of energy input on flotation kinetics
… literature and to fundamental models for particle-bubble contacting. The third objective was to determine whether the experimental results from the laboratory OGC are consistent with those from a pilot-scale OGC operating on a platinum ore. Galena, pyrite, pentlandite (-150 μm), apatite …
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Salt marsh substrate composition and responses to applied stress
… in marsh composition. This research finds that particle size is a key control on marsh resistance to particle detachment, with root- and organic content providing an important secondary influence on marsh resistance, particularly to bulk failure processes. By comparing the angle of internal …
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Model electrode structures for studies of electrocatalyst degradation
… catalyst in these systems consists of nanoparticles of Pt or Pt-based alloys on carbon supports. Understanding the role of the nanoparticle size and structure on the catalytic activity and degradation is needed to optimize the fuel cell performance and reduce the noble metal loading. …
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Pt and Pt-Pd cluster interaction with graphene and TiO₂ based supports: A DFT study
… the durability of the catalyst by limiting particle detachment. The electronic properties of the cluster are modified differently depending on the identity of the defect present on the support. On the graphene based supports, OH functionalisation is expected to result in weaker binding …
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Understanding Mechanisms of Water Lead Contamination by Nitrate Spallation Corrosion and Lead Removal by Point-of-Use (POU) Filters
… water by a process of corrosion, dissolution or particle detachment from lead bearing plumbing materials. Preventing contamination of water from lead-tin solder corrosion and achieving effective removal of particulate lead by point-of-use (POU) filters are important public health goals. These …