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Creep and creep-rupture of Alloy 617
Wright, J.K.,Lillo, T.M.,Wright, R.N.,Kim, Woo-Gon,Sah, In-Jin,Kim, Eung-Seon,Park, Ji-Yeon,Kim, Min-Hwan Elsevier 2018 Nuclear engineering and design Vol.329 No.-
<P><B>Abstract</B></P> <P>The Ni-Cr-Mo-Co material Alloy 617 is the leading candidate for VHTR intermediate heat exchangers operating above 750°C. Time-dependent properties are an important consideration in qualifying the alloy for construction of nuclear components. Creep behavior of several different heats of Alloy 617 has been evaluated in the temperature range of 800–1000°C. Power law creep behavior was observed for the minimum creep rate, with a stress exponent of 5.6 and activation energy of approximately 400kcal/Mol. The Monkman-Grant approach relating minimum creep rate to time to rupture gave a reasonable representation of the data for all of the testing with a slope of −0.84. Similarly, a modified Monkman-Grant fit the strain to failure data reasonably well. A Larson-Miller analysis was carried out to compare rupture behavior determined in the current experiments and historical data with well-known provenance over a wide range of conditions. It appears that the properties of modern heats of material are near the lower bound of rupture behavior when all of the data are considered in the same analysis.</P>
Christina Huang Wright,James Wright,Anish Badjatiya,Sunil Manjila,Steven Reed,Robert Geertman 대한뇌혈관외과학회 2015 Journal of Cerebrovascular and Endovascular Neuros Vol.17 No.4
Pseudoaneurysms of the superficial temporal artery are rare and may be treated by manual compression, surgical intervention, coil embolization, or percutaneous thrombin injection. We present a novel technique of local ultrasound guided low-profile coil embolization of the superficial temporal artery with both satisfactory cosmetic and surgical results
UV Disinfection of Wastewater : Key Factors for Effective System Design
Wright, H.,Brunet, R.,Sakamoto, G.,Cairns, W. 영남대학교 환경문제연구소 2000 環境硏究 Vol.19 No.2
UV disinfection causes cross-linking of the DNA of micro-organisms, preventing their replication. The UV dose determines the level of disinfection, and is the product of UV germicidal intensity and reactor retention time. Reactors size depends on the flow and required dose for the water quality to be treated. Water quality is a function of the upstream treatment process, as shown through lab and pilot scale analysis of the UV dose response of effluent from primary, secondary, and tertiary plants. The most important water quality parameters are the ultraviolet transmittance (UVT) of the wastewater, and both the size and number of particles produced. As the level of treatment increases, the total suspended solids (TSS) generally decrease and UVT improves, reducing the reactor size. The use of ferric based flocculating agents decreases UVT and negatively impacts disinfection performance as compared with alum. Fouling of the quartz sleeves is increased with ferric flocculants.
Development and validation of a non-linear k-ε model for flow over a full-scale building
Wright, N.G.,Easom, G.J.,Hoxey, R.J. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.3
At present the most popular turbulence models used for engineering solutions to flow problems are the $k-{\varepsilon}$ and Reynolds stress models. The shortcoming of these models based on the isotropic eddy viscosity concept and Reynolds averaging in flow fields of the type found in the field of Wind Engineering are well documented. In view of these shortcomings this paper presents the implementation of a non-linear model and its evaluation for flow around a building. Tests were undertaken using the classical bluff body shape, a surface mounted cube, with orientations both normal and skewed at $45^{\circ}$ to the incident wind. Full-scale investigations have been undertaken at the Silsoe Research Institute with a 6 m surface mounted cube and a fetch of roughness height equal to 0.01 m. All tests were originally undertaken for a number of turbulence models including the standard, RNG and MMK $k-{\varepsilon}$ models and the differential stress model. The sensitivity of the CFD results to a number of solver parameters was tested. The accuracy of the turbulence model used was deduced by comparison to the full-scale predicted roof and wake recirculation zone lengths. Mean values of the predicted pressure coefficients were used to further validate the turbulence models. Preliminary comparisons have also been made with available published experimental and large eddy simulation data. Initial investigations suggested that a suitable turbulence model should be able to model the anisotropy of turbulent flow such as the Reynolds stress model whilst maintaining the ease of use and computational stability of the two equations models. Therefore development work concentrated on non-linear quadratic and cubic expansions of the Boussinesq eddy viscosity assumption. Comparisons of these with models based on an isotropic assumption are presented along with comparisons with measured data.
Wright, N.G.,Easom, G.J. Techno-Press 1999 Wind and Structures, An International Journal (WAS Vol.2 No.4
Accurate turbulence modeling is an essential prerequisite for the use of Computational Fluid Dynamics (CFD) in Wind Engineering. At present the most popular turbulence model for general engineering flow problems is the ${\kappa}-{\varepsilon}$ model. Models such as this are based on the isotropic eddy viscosity concept and have well documented shortcomings (Murakami et al. 1993) for flows encountered in Wind Engineering. This paper presents an objective assessment of several available alternative models. The CFD results for the flow around a full-scale (6 m) three-dimensional surface mounted cube in an atmospheric boundary layer are compared with recently obtained data. Cube orientations normal and skewed at $45^{\circ}$ to the incident wind have been analysed at Reynolds at Reynolds number of greater than $10^6$. In addition to turbulence modeling other aspects of the CFD procedure are analysed and their effects are discussed.