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 20 of 72 for “"Particle interaction"”.
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Specialized Inter-Particle Interaction Lbm For Patterned Superhydrophobic Surfaces
<p>SPECIALIZED INTER-PARTICLE INTERACTION LBM FOR PATTERNED SUPERHYDROPHOBIC SURFACES</p> <p>by</p> <p>AMAL S. YAGUB</p> <p>ABSTRACT:</p> <p> Superhydrophobic surface characteristics are important in many industrial applications, ranging from the textile to the military. It was observed that …
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Mode conversion and wave -particle interaction processes in the solar wind
… the theoretical study of wave coupling and wave-particle interaction processes in the solar corona and wind. We first investigate the effect of an inhomogeneous velocity field on the propagation of waves in the solar atmosphere. We find that coupling between Alfven waves and fast magnetosonic …
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Measurement of particle interaction properties for the incorporation into Discrete Element Methods
… the dynamics of charge motion with in a mill. Particle interactions in DEM are calculated by contact force and force displacement laws at each particle contact. These contact events are characterized by parameters that are often fitted or estimated due to the lack of accurate experimental …
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A bubble-particle interaction model for flotation combining hydrodynamic and surface forces
It is generally recognized that the recovery of particles from a flotation pulp is controlled by (i) the flotation rate constant and (ii) the residence time distribution of the particles. In the present work, theoretical and experimental analyses have been carried out to develop methods for …
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Dynamic behavior of unsteady turbulent motion in pipe flows of dense gas-solid suspensions
… lacking. For a dense suspension, the effects of particle-particle interaction, the damping of fluid motion by particles and the phase interactions between the dense phase and dilute phase have to be studied by relating both averaged and statistical properties of the phases. A complete set of …
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Dislocation -Obstacle Interactions in Aluminum Alloys
… examines two types of dislocation-obstacle interactions: dislocation-particle interactions during creep deformation, and dislocation-loop interactions during deformation at room temperature. Dislocation-particle interaction studies in Al-Zn-Mg-Cu-Zr, Al-4Mg-0.3Sc, and Al-0.3Sc showed that …
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Validation and Application of a First Principle Flotation Model
… from the basic mechanisms involved in the bubble-particle and bubble-bubble interactions occurring in flotation. It is a kinetic model based on the premise that the energy barrier (E1) for bubble-particle interaction can be reduced by increasing the kinetic energy (Ek) for bubble-particle …
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Electron Bernstein wave current drive modeling in toroidal plasma confinement
… of EBWs, the physics of resonant wave-particle interaction, and the CD mechanisms are investigated in detail. The CD efficiency and the current deposition profile are calculated using the numerical code DKE, which solve the drift-kinetic equation. Two scenarios for EBWCD are identified. …
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Observation of nonlinear tunneling of a Bose-Einstein condensate in a single Josephson junction
… because the difference between the on-site particle interaction energies in the two wells exceeds the tunneling energy splitting. As a consequence, the atomic distribution becomes self-locked and the relative phase evolves unbound in time. This regime of prohibited tunneling, which has no …
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A coupled DEM/CFD analysis of die filling process
… employs a Discrete Element Method (DEM) for the particles and Computational Fluid Dynamics (CFD) for the air with a two-way air-particle interaction coupling term. The effects of air and particle properties (size, density, size distribution, cohesion etc.) on powder flow are explored. The results …
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Bauschinger effect in Nb and V microalloyed line pipe steels
… The dislocation density and (Ti,Nb,V,Cu)-rich particle diameter, volume fraction and number density were measured for as-rolled and annealed (30 min. at 400 \(^0\)C and 550 \(^0\)C) steels. The Bauschinger effect was measured during compression-tension testing for the same steel conditions. The …
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Detailed Studies of Drying and Crack Formation in Aggregated Colloidal Suspensions
In this thesis we present evidence that particle interaction forces play an important role in the cumulative drying behavior of suspensions of aggregated colloidal particles. In particular, they control the shape and deformation behavior during drying of these suspensions. We identify a single …
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The Diffuse Bounce Back Lattice Boltzmann Method and its Applications on the Study of Fluid-Particle Interactions
<p>Fluid-structure interaction is very broadly seen and widely used in many industrial, engineering and environmental processes. The lattice Boltzmann method has been preferred for simulating particulate flows due to its advantages of easy implementation, micro- and mesoscopic physical insights and …
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Surfactants in nonpolar oils: agents of electric charging and nanogel templates
… observable surface charge of suspended polymer particles. Both types of surfactant are found to generate mobile ions in solution as well as particle charge; and in the more surprising case of nonionic surfactants, the occurrence of particle charge and screening ions is confirmed independently by …
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Radiation reaction in strong fields from an alternative perspective
… By exploring radiation reaction effects on a particle colliding with an ultra-intense laser pulse we show that the regime where there is a significant deviation of these two approaches can never be reached with existing or proposed laser facilities. The methods used to explore single particle …
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Nanocrystalline Fe-Pt alloys: phase transformations, structure and magnetism
… enhancement due to large effects of exchange interactions between the crystallites of the phases. The structure, magnetic properties and magnetisation reversal processes of these alloys are investigated. Experimentally observed phenomena are understood on the basis of a simple two-particle …
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Adhesion of silver nanoparticle amendments to ceramic water filters
Silver nanoparticles (Ag NPs) are frequently added as a disinfectant to ceramic filters used for household drinking water treatment. To provide suspension phase particle stability, Ag NPs can be synthesized using a number of different molecules to cap the metal core. The goal of this doctoral work …
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Physical modelling of colloidal slurry flows
… the continuous phase. The strength of the particle-particle interaction is significantly influenced by the electrolyte concentration. An increase in the electrolyte concentration from 10 4M to IM results in the formation of aggregates, thus influencing the sedimentation, sediment bed …
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Development of detectors for the monitoring of mixed radiation fields
… efficiency. The integration of detailed particle interaction modeling with advanced charge transport simulations enables an efficient exploration of detector geometries and accurate estimation of performance metrics. The results provide valuable guidelines for optimizing neutron detection …
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Investigation of the hydrodynamics and scale-up of advanced TRISO nuclear fuel manufacturing using sophisticated measurement techniques
… on the quality of the TRISO nuclear fuel coated particles. However, the coating of the TRISO particles is delicate process and impacted by the hydrodynamics of spouted beds. Therefore, in this work, we applied advanced non-invasive measurement techniques which are gamma-ray computed tomography …
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