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 15 of 15 for “"O-ring"”.
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A novel method to evaluate synthetic fuel options for gas turbines in terms of O-ring swelling
… in the tendency of the fuel to swell nitrile O-rings. This is of particular concern as the transition of synthetic fuels to conventional fuels can result in fuel leakage and elastomer shrinkage in fuel distribution systems.
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Effects of O-Ring Elastomers with Conventional and Synthesized Aviation Fuels with a Novel Elastomer Dynamic Compression System
The continual compatibility of elastomer O-ring seals installed in aircraft engines and fuel systems is of upmost importance as novel synthetic aviation fuels are introduced for use in aviation operations. The aim of this research is to investigate the reactions of common aviation O-rings with the …
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The performance of high speed reciprocating polymer seals in water
… High Molecular Weight Polyethylene (UHMWPE) ring, energised to remain in contact with the reciprocating piston, using a nitrile rubber o-ring. The design of the seals is such that they do not facilitate the formation of a lubricating film, and the high contact stresses at the seal face due to …
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Assembly Optimization for Double Row Ball Bearings
… optimal assembly methods for double row ball bearings. As with common single row bearings, double row ball bearings, consist of four general components, namely, an inner ring, an outer ring, a complement of balls and a cage or retainer to keep the balls separate. Unlike single row bearings, …
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Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage
… detection and repair programs. Elastomeric O-rings can be used as valve stem seals, and O-ring manufacturers recommend lubrication of elastomeric seals to prevent damage and to assure proper sealing. In this research, a metallic coating was applied as a lubricant using a vacuum vapor …
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Design, fabrication, and testing of a mechanical timer in application of a stored-heat solar cooker
… a stored-heat solar cooker that may be left during the day and acquired at night to cook meals. Previously, a prototype had been built without much success in the timing of the device. This thesis aims to solve this problem by designing, building, and testing a mechanical timer. Several design …
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Heat resistance of Salmonella typhimurium and Listeria monocytogenes in suspension and in a biofilm matrix
… menstrum. Biofilms were grown on Buna-n rubber o-rings (4.46 mm O.D. x 1.41 mm]. D.) for 36 hours. All other cultures used were in stationary phase of growth. The three treatments tested were: inoculated milk, sterile milk and a biofilm on an o-ring, and inoculated milk with a sterile o-ring. At …
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Hydraulically controlled magnetic bougienage for correction of long-gap esophageal atresia
… neutral gap size between the two magnets. A syringe pump pushes water through the catheter to extend the tip of the bougie. Therefore, the system can stretch the esophageal pouch without changing the gap size between the two magnets, which helps to apply the stretching force in a controllable …
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Modular LEGO brick microfluidics
… enables fluid to pass between bricks via an O-ring with >99.9% sealing reliability. Using the LEGO-based approach, I build systems made of assembled brick units for generating droplets, sensing light, sorting with inertial and magnetic forces, and repeatably positioning a smartphone camera, and …
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Lifetime Prediction and Durability of Elastomeric Seals for Fuel Cell Applications
… gases can leak or mix with each other directly during operation or standby, affecting the overall operation and performance of the FC. The elastomeric gaskets used as FC seals are exposed to a range of environmental conditions, and concurrently, subjected to mechanical compression between the …
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The effect of different chemical classes on the swelling of NBR O-rings in blends with synthetic paraffinic kerosene
… was developed to remove plasticiser for the O-ring seals to provide samples that are more representative of O-rings in service. Experiments were conducted on both new and conditioned (deplasticised) NBR O-ring samples. Materials tested in this investigation included petroleum-derived Jet A-1, …
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Mechanics of swellable elastomeric seals
… seals for the purpose of hydraulic fracturing in oil and gas applications. The first component of the thesis is the development of a laboratory-scale apparatus for the visualization of swellable seals in situ up to the point of leakage. Experiments using this apparatus show that leakage is …
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Investigation on Physics-based Multi-scale Modeling of Contact, Friction, and Wear in Viscoelastic Materials with Application in Rubber Compounds
… and soles, wiper blades, artificial joints, O-ring seals, and so on. In all these applications, the objective is to maximize the friction coefficient to avoid slipping and reduce the wear rate to improve the life expectancy and performance of the products. The first topic in this study focuses …
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MULTI-IONIC LITHIUM SALTS FOR USE IN SOLID POLYMER ELECTROLYTES FOR LITHIUM BATTERIES
… of polar POSS-PEG8, the hydrophobic phenyl rings of POSS-phenyl7(BF3Li)3 aggregate and crystallize, forming a biphasic morphology, in which the phenyl rings form the structural phase and the POSS-PEG8 forms the conductive phase. The -Si-O-BF3- Li+ groups of POSS-phenyl7(BF3Li)3 are oriented …
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Selective oxidation of methane in a trickle bed reactor over a platinum-based catalyst
… were pressurized and flow-metered prior to entering the reactor while the flow of deionized liquid water was controlled through a pump. The reactor assembly consisted of a quartz tube liner sealed at the top with a fluorocarbon O-ring in a stainless-steel shell (545 mm in length and 15.8 mm in …