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 39 for “"particle impact"”.
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Computational model of ductile erosion by single particle impact
Erosion by solid particle impact is a common problem in many industrial applications. It results due to mechanical contact between the particle and the metal surface, which in turn result in potential material losses. Erosion of machine parts by the small solid particle entrained in liquid or …
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The erosion of ductile metals by solid particle impact
… of high localised stresses. Erosion by solid particle impact is a problem of great practical significance which can result in component failures in, for example, turbines and energy conversion systems. This dissertation describes experiments in which ductile metal surfaces were eroded with …
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Laser-Induced Particle Impact Testing in High-Pressure Oxygen Environments
Particle impact ignition is an important source of metal fires in the high-pressure oxygen environments found in the turbines of oxygen-rich turbopumps. Understanding of particle impact ignition has been hindered by experimental challenges in reproducing this phenomenon under controlled laboratory …
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Effect of 3D Architecture on Energy Dissipation during High-speed Particle Impact
… largely unexplored. Here, using supersonic microparticle impact, the impact response of different 3D-printed microscale architectures are compared to each other and a non-architected mass equivalent sample to examine the effect of architecture on material impact response. This response is …
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ULTRA-HIGH STRAIN RATE CONSTITUTIVE MODELING OF PURE TITANIUM USING PARTICLE IMPACT TEST
… advanced testing strategies like laser-induced particle impact test, it is possible to study materials mechanics under extremely high deformation rates, i.e., above 10^6 s^-1, a relatively less explored regime of strain rates. In this study, we accelerate microparticles of commercially pure …
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Impact and melting dynamics of micron-sized particles on a liquid pool
… transparent model system was designed, in which impact and subsequent melting of paraffin wax particles (melting point: ≈60°C, diameter: 200-800 μm, impact velocity: 0.3-1.9 m/s) onto a pool of liquid paraffin with temperatures 100-130<sup>o</sup>C was investigated. The micron-sized paraffin …
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Characterisation and prediction of particle attrition in lean phase pneumatic conveyors: the influence of particle concentration
This thesis aimed to determine the influence of particle concentration on the magnitude of measured particle attrition within horizontal, homogeneous lean phase pneumatic conveying systems. Furthermore, to propose a characterisation method for predicting the magnitude of particle attrition in such …
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Characterization of microparticle velocities in converging-diverging nozzle systems
… may cause damage to them. Ongoing work in particle impact damage modeling, aerosol deposition methods, and fundamental studies of particle impact dynamics require acceleration of particles to high speeds and associated measurements, models, and simulations to characterize particle …
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Development and validation of a novel hybrid CFD slurry model
… one phase for the fluid, one phase for the particles.;The two phase models can, broadly speaking, be separated into two categories: Euler-Euler (EE), and Euler-Lagrange (EL). EE models the fluid and particles as two continua, is fast to run, but lacks particle impact data which is required …
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CFD-based erosion modelling of simple and complex geometries
… reducing their product's susceptibility to solid particle erosion. A CFD-based erosion modelling tool is achieved by first solving the fluid flow through the component of interest; tracking particles through the fluid and extracting impact data on all solid surfaces; and finally relating the …
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Abrasion Prediction at Kayraktepe Sediment Bypass Tunnel in Turkey
… stress term gives much higher values than its particle impact term does. However, when examining the effect of particle impact term by neglecting the grinding stress, the model predicts consistent results. The model by Auel at al. (2015) demonstrates reasonable predictions in case of regulated …
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The solid particle erosion of WC-Co alloys
… involving the erosion of WC-Co alloys by solid particle impact erosion was undertaken to determine the mechanism by which material is removed. For this purpose a simple particle-gas stream erosion apparatus was employed. The nineteen different WC-Co alloys studied were initially characterised …
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Structure-property relationships of earth and engineered materials
… the properties inherent in atmospheric mineral particles and their consequences on aerospace-grade material are investigated. The mineralogy and particle-based characteristics of test dusts are comprehensively described using a detailed mineralogical characterization workflow. The morphologies …
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Experimental Investigation of Temperature Effects on Microparticle Sand Rebound Characteristics at Gas Turbine Representative Conditions
When a gas turbine operates in a particle laden environment, such as a desert, small solid particles are ingested into the engine. The ingested sand particles can cause damage to engine components and reduce the service life of the engine. Particle ingestion causes the erosion of metal blades and …
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Erosion - corrosion mechanisms of stainless steel UNS S31603
Solid particle erosion-corrosion is the wear caused by the combined action of the mechanical process of solid particle erosion and the electrochemical process of corrosion. This joint action leads to a synergistic interaction that enhances the wear rate of the material, causing severe problems to …
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Optimization of indentification of particle impacts using acoustic emission.
Air-borne or liquid-laden solid particle transport is a common phenomenon 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 …
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Structural and Thermal Properties of Ignition Resistant Coatings for Reusable Rocket Engines
… RD-180 engines, which prevents ignition due to particle impact on ox-turbopump turbine. Ignition resistant environmental barrier coatings are of particular interest for reusable rocket systems, which have recently suffered oxygen compatibility failures. The study details the fabrication and …
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Energy dissipation in shape memory zirconia particles, packings, and composites
… dissipation in a granular packing. Various particle size distributions were selected to study mechanisms of energy dissipation in a granular packing including particle friction, fracture, and martensitic phase transformation. To study the behavior of encapsulated shape memory and …
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