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 27 for “"hydrogen transport"”.
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Modeling Hydrogen Transport in BABY
… environment. In this context, understanding hydrogen transport phenomena within the BABY system emerges as a crucial aspect of optimizing tritium extraction and ensuring tritium self-sufficiency. By employing advanced modeling techniques simulating fluid flow and heat transfer to inform …
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Hydrogen Transport in and Through Niobium
… roles of bulk diffusion and surface processes in hydrogen transport in and through niobium. Bulk hydrogen and deuterium diffusivities and permeabilities were measured at high temperatures (700 - 1400 K) using diffusion controlled permeation methods. At lower temperatures, surface controlled …
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Hydrogen transport in and through niobium
… roles of bulk diffusion and surface processes in hydrogen transport in and through niobium. Bulk hydrogen and deuterium diffusivities and permeabilities were measured at high temperatures (700 -1400 K) using diffusion controlled permeation methods. At lower temperatures, surface controlled …
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Hydrogen Transport and Hydrogen Embrittlement in Stainless Steels (Diffusion, Permeation, Solubility, Slow Crack Growth)
In order to understand the kinetics of gaseous hydrogen-induced slow crack growth (SCG) in metastable austenitic stainless steels, hydrogen permeation and/or cracking velocity were measured and compared for three types of stainless steels. These included austenitic, ferritic, and duplex …
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HYPERION: A HYdrogen PERmeatION Experiment to Quantify Hydrogen Transport in Fusion-Relevant Molten Salts
The measurement of hydrogen transport properties of molten salts like FLiBe is crucial for the development of advanced nuclear technologies like lithium-bearing liquid immersion breeding blankets for fusion reactors. Tritium production and the quantification of its mobility in these materials is …
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Hydrogen transport in hydride and non-hydride forming metals and the mechanistic implications for fracture behavior
… a complete mechanistic understanding of the hydrogen embrittlement phenomenon has yet to be achieved. Regardless of the specific mechanism of hydrogen embrittlement, a better understanding of hydrogen transport, hydride formation and their mechanistic effects on stress and strain is needed to …
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INNOVATION AND OPTIMIZATION OF THE HYDROGEN TRANSPORT AND DISTRIBUTION CHAIN AS A GREEN AND RENEWABLE ENERGY VECTOR
Because of its enormous energy storage capacity, hydrogen appears to play a significant role in a world where fossil fuel depletion, global warming, and growing energy consumption are the main factors. However, issues with storage and transportation restrict its application. The aim of this thesis, …
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Fatigue crack growth in hydrogen pipeline steels
Pipeline hydrogen transport and distribution are contemplated for hydrogen applications. Hydrogen introduction in the natural gas pipeline systems is also considered in the power to gas (P2G) approach to utilizing excess renewable energy when the supply exceeds the demand. It is well known that …
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Thin film Palladium-Ytrium membranes for hydrogen separation
The permeability of hydrogen in thin film Pd-Y composite membranes has been investigated for the first time. Thin (5 µm) Pd-Y films were deposited onto macroporous 316L stainless steel substrates by magnetron sputtering. Prior to deposition, a novel laser melting technique was employed in an …
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Micromechanics of the Hydrogen Effect on Plasticity and Interfacial Decohesion
… the cohesion of an interface in the presence of hydrogen is suggested and implemented through interfacial cohesive finite elements to study interfacial debonding around an elastic particle imbedded in an elastoplastically deforming matrix, while transient hydrogen transport takes place in the …
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Caratterizzazione di membrane inorganiche per la separazione di idrogeno da gas di reforming
… characterisation of inorganic membranes for the hydrogen purification from steam reforming gas. Composite membranes based on porous inorganic supports coated with palladium silver alloys and ceramic membranes have been analysed. A brief resume of theoretical laws governing transport of gases …
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Hydrogen in metals: a nondestructive test
… nondestructive test to determine the presence of hydrogen in a material system. The feasibility of such a system is examined here. Acoustic emission activity resulting from a microhardness indentation is employed to detect hydrogen in A106 and 4340 steel bars following cathodic, gaseous, and …
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Hydrogen permeation in uncoated and coated X60steel
The sustainable storage and transport of hydrogen represent major challenges for the deployment of renewable energy systems, requiring a comprehensive understanding of hydrogen–material interactions in pipeline steels and effective strategies to limit hydrogen uptake. This PhD research investigates …
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Hydrogen embrittlement: an interfacial phenomenon
Hydrogen transport during a test and hydrogen segregation to twins, second phase particles and precipitation products prior to testing are shown to adversely effect the mechanical properties of metals. Hydrogen embrittlement processes in austenitic stainless steel, mild steel and aluminum occurred …
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Development of a 3D Printer for Oxide-free Aluminum Transportation
Hydrogen as an energy carrier is abundant, has a high caloric value and only produces water when combusted. A challenge is directly transporting hydrogen incurs high costs due to its low density. The low flammability limit also makes it dangerous to transport. Aluminum has been proposed as an …
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Microstructure-informed modeling of hydrogen diffusion in zirconium polycrystals
… water coolant reacts with zirconium and releases hydrogen atoms that ingress into the lattice of the metal alloy. With time, hydrogen concentration exceeds its terminal solid solubility limit in zirconium, and a brittle phase known as zirconium hydride forms. This phase severely deteriorates the …
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Catalytic coatings for vanadium-based hydrogen membranes
… alternative to palladium as a dense metallic hydrogen membrane. However, catalytic surface coatings must be applied to vanadium surfaces to enable the transport of molecular hydrogen. These coatings facilitate dissociation and recombination kinetics of molecular hydrogen and protect vanadium …
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Escape of hydrogen from the exosphere of Mars
After decades of exploration, the martian neutral hydrogen exosphere has remained poorly characterized. The first measurements of this layer by Mariner 6 and 7 revealed it to be optically thick in Lyman α emission, along with a characteristic temperature that was higher than the majority of the …
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Application of hydrogen marine systems in high-speed sea container transport
… barrier in high-speed ship design and the use of hydrogen as a marine fuel to overcome this barrier. Simultaneously, it is now accepted that environmental pollution from ships, particularly large container ships, contributes to climate change. Hydrogen marine utilization provides a solution for …
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