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Viscous effects on a turbulent jet near nozzle exit

Description: Analysis is made of the viscous effects on changes in the velocity profile of an incompressible turbulent jet exhausting into an immiscible ambient medium. Under some simplifying conditions, a closed-form solution is obtained. The results demonstrate possible retardation of turbulent jet breakup due to viscous effects.
Date: January 1, 1979
Creator: Kang, S.W.
Partner: UNT Libraries Government Documents Department
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Jet stability in the lithium fall reactor

Description: A preliminary analysis has been made of the various hydrodynamic aspects involved in the stability of a liquid-lithium jet in a laser-fusion reactor, which comprises a part of LLL's laser fusion power-generation concept. Various physical factors that may affect the jet breakup are delineated, and some approximate calculations are performed to determine their relative influences. Areas of uncertainty are pointed out, along with plans for experimental verification or further theoretical analysis.
Date: May 4, 1978
Creator: Kang, S.W.
Partner: UNT Libraries Government Documents Department
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Lithium fall reactor concept: the question of jet stability, with recommendations for further experiments

Description: The stability of a liquid-lithium jet flow is of importance in a laser fusion reactor design. In this report we analyze and discuss jet stability with respect to fluid dynamics, delineating physical factors that may affect the jet breakup and performing some simple calculations to determine quantitatively the relative influences of various parameters. We define areas of uncertainty and recommend possible experimental verification, theoretical analysis, or both.
Date: August 21, 1978
Creator: Kang, S.W.
Partner: UNT Libraries Government Documents Department
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Unsteady jet-slug dynamics. [BWR]

Description: The present analysis treats the transient load characteristics at the wet-well bottom during the vent-clearing event under loss-of-coolant accident conditions. A conceptual model is introduced wherein the liquid-jet inertia and the net momentum-efflux are the two dominant physical factors. The derived load-history equations were found to be functions of the vent-clearing characteristics and of the jet-decay mode in the liquid pool. The theoretical results obtained by a physical modelling of the… more
Date: September 9, 1977
Creator: Kang, S. W.
Partner: UNT Libraries Government Documents Department
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Manufacturing and coating by kinetic energy metallization

Description: The purpose of this effort was to theoretically model the underlying metal-coating phenomena when metal particles impact a metal surface at high velocities under room temperature conditions. The physical processes involved in the novel metal-coating process called Kinetic Energy Metallization (KEM) have been theoretically and numerically analyzed. A bonding model between the incident and the target metals has been proposed and preliminary numerical results agree reasonably well with the laborat… more
Date: February 9, 1998
Creator: Kang, S.W.
Partner: UNT Libraries Government Documents Department
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Analysis of large urban fires

Description: Fires in urban areas caused by a nuclear burst are analyzed as a first step towards determining their smoke-generation chacteristics, which may have grave implications for global-scale climatic consequences. A chain of events and their component processes which would follow a nuclear attack are described. A numerical code is currently being developed to calculate ultimately the smoke production rate for a given attack scenario. Available models for most of the processes are incorporated into th… more
Date: November 1, 1984
Creator: Kang, S. W.; Reitter, T. A. & Takata, A. N.
Partner: UNT Libraries Government Documents Department
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Literature survey of blast and fire effects of nuclear weapons on urban areas

Description: The American literature of the past 30 years on fire and blast effects of nuclear weapons on urban areas has been surveyed. The relevant work is briefly sketched and areas where information is apparently lacking are noted. This report is intended to provide the basis for suggesting research priorities in the fire and blast effects area for the Federal Emergency Management Agency. It is also intended to provide entry into the literature for researchers. over 850 references are given.
Date: June 1, 1982
Creator: Reitter, T.A.; McCallen, D.B. & Kang, S.W.
Partner: UNT Libraries Government Documents Department
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Fire initiation and spread in urban areas due to nuclear attack

Description: Calculation of fire development in urban areas is a critical step in estimating the global effects of nuclear warfare with regard to smoke production and transport. As part of the first phase of a program to improve our ability to calculate fire starts and spread in urban areas, we have performed a parameter sensitivity analysis using the three codes originally developed for civil defense planning by the IIT Research Institute. We have added graphics and made slight improvements to the codes an… more
Date: September 1, 1984
Creator: Reitter, T. A.; Takata, A. N. & Kang, S. W.
Partner: UNT Libraries Government Documents Department
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Analysis of interaction phenomena between liquid jets and materials [preprint]

Description: The interaction phenomena of high-velocity liquid jets impinging on a material surface have been investigated theoretically and experimentally to understand the physics of material removal by jet-machining processes. Experiments were performed to delineate conditions under which liquid jet impacts will cause mass removal and to determine optimum jet-cutting conditions. Theoretical analyses have also been carried out to study the effects of multiple jet-droplet impacts on a target surface as a m… more
Date: April 1, 1995
Creator: Kang, S-W.; Reitter, T. & Carlson, G.
Partner: UNT Libraries Government Documents Department
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Analysis of interaction phenomena between liquid jets and materials. Revision 1

Description: The interaction phenomena of high-velocity liquid jets impinging on a material surface have been investigated theoretically and experimentally to understand the physics of material removal by jet-machining processes. Experiments were performed to delineate conditions under which liquid jet impacts will cause mass removal, and to determine optimum jet-cutting conditions. Theoretical analyses have also been carried out to study the effects of multiple jet-droplet impacts on a target surface as a … more
Date: April 1, 1995
Creator: Kang, S.W.; Reitter, T. & Carlson, G.
Partner: UNT Libraries Government Documents Department
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Analytical and experimental evaluation of joining silicon nitride to metal and silicon carbide to metal for advanced heat engine applications. Final report

Description: This report summarizes the results of Phase 2 of Analytical and Experimental Evaluation of Joining Silicon Nitride to Metal and Silicon Carbide to Metal for Advanced Heat Engine Applications. A general methodology was developed to optimize the joint geometry and material systems for 650{degrees}C applications. Failure criteria were derived to predict the fracture of the braze and ceramic. Extensive finite element analyses (FEA) were performed to examine various joint geometries and to evaluate … more
Date: May 1, 1993
Creator: Kang, S.; Selverian, J. H.; O`Neil, D.; Kim, H. & Kim, K.
Partner: UNT Libraries Government Documents Department
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The influence of grain structure on the reliability of narrow Al- based interconnects

Description: The work reported here concerns the effect of grain structure on electromigration failure in pure A1 and A1-2wt.% Cu-1 wt.% Si lines. The grain structure of fine lines were controlled by annealing after pattering to promote the formation of ``bamboo`` structures. Significant improvements in the median time to failure (MTF) and the deviation of the time to failure (DTF) were observed with the development of near-bamboo structures with polygranular-segment lengths shorter than {approximately} 5 {… more
Date: May 1, 1995
Creator: Kang, S.H.; Kim, C.l Morris, J.W. Jr. & Genin, F.Y.
Partner: UNT Libraries Government Documents Department
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Mechanism of electromigration failure in Al thin film interconnects containing Sc

Description: In order to understand the role of Sc on electromigration (EM) failure, Al interconnects with 0.1 and 0.3 wt.% Sc sere tested as a function of post-pattern annealing time. In response to the evolution of the line structure, the statistics of lifetime evolved. While the addition of Sc greatly reduces the rate of evolution of the failure statistics because the grain growth rate decreases, the MTF variation was found to be very similar to that of pure Al. These observations seem to show that Sc ha… more
Date: May 1, 1995
Creator: Kim, Choong-un; Kang, S.H.; Morris, J.W. Jr. & Genin, F.Y.
Partner: UNT Libraries Government Documents Department
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Screening report on cell materials for high-power Li-Ion HEV batteries.

Description: The Battery Technology Department at Argonne National Laboratory is a major participant in the U.S. Department of Energy's Advanced Technology Development (ATD) program. This multi-national laboratory program is dedicated to improving lithium-ion batteries for high-power HEV and FCEV applications. As part of the FreedomCAR Partnership, this program is addressing the three key barriers for high-power lithium-ion batteries: calendar life, abuse tolerance, and cost. All three of these barriers can… more
Date: April 24, 2003
Creator: Liu, J.; Kahaian, A.; Belharouak, I.; Kang, S.; Oliver, S.; Henriksen, S. et al.
Partner: UNT Libraries Government Documents Department
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Recent Progress in the Use of Synchrotron Radiation for the Analysis of Coal Combustion Products

Description: The formation and build-up of slag deposits on heat transfer surfaces is one of the most serious problems in pulverized coal combustion. This phenomenon, traditionally called wall slagging, is known to cause undesirable effects on heat and mass transfer and in some instances induce corrosion. What is believed to be a major mechanism for the production of slag is the formation of low melting eutectic compounds in the post combustion region, many of which will stick to the heat transfer surface. … more
Date: May 1, 1994
Creator: Manowitz, B.; Kang, S. G.; Bool, L.; Helble, J. J.; Shah, N. & Huffman, G. P.
Partner: UNT Libraries Government Documents Department
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Recent progress in the use of synchrotron radiation for the analysis of coal combustion products

Description: The formation and build-up of slag deposits on heat transfer surfaces is one of the most serious problems in pulverized coal combustion. This phenomenon, traditionally called wall slagging, is known to cause undesirable effects on heat and mass transfer and in some instances induce corrosion. What is believed to be a major mechanism for the production of slag is the formation of low melting eutectic compounds in the post combustion region, many of which will stick to the heat transfer surface. … more
Date: June 1, 1993
Creator: Manowitz, B.; Kang, S. G.; Moore, J.; Helble, J. J.; Shah, N. & Huffman, G. P.
Partner: UNT Libraries Government Documents Department
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Uranium alloy forming process research

Description: The study of modern U-6Nb processes is motivated by the needs to reduce fabrication costs and to improve efficiency in material usage. We have studied two potential options: physical vapor deposition (PVD) for manufacturing near-net-shape U-6Nb, and kinetic-energy metallization (KEM) as a supplemental process for refurbishing recycled parts. In FY 1996, we completed two series of PVD runs and heat treatment analyses, the characterization of the microstructure and mechanical properties, a compar… more
Date: March 1, 1997
Creator: Chow, T.S.; Biesiada, T.A.; Sunwoo, A.; Long, J.; Anklam, T. & Kang, S.W.
Partner: UNT Libraries Government Documents Department
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Analytical and experimental evaluation of joining silicon nitride to metal and silicon carbide to metal for advanced heat engine applications

Description: This report summarizes the results of Phase I of Analytical and Experimental Evaluation of Joining Silicon Nitride to Metal and Silicon Carbide to Metal and Silicon Carbide to Metal for Advanced Heat Engine Applications. A general methodology was developed to optimize the joint geometry and material systems for 650 and 950{degree}C applications. Failure criteria were derived to predict the fracture of the braze and ceramic. Extensive finite element analyses (FEA), using ABAQUS code, were perfor… more
Date: April 1, 1990
Creator: Kang, S.; Selverian, J.H.; Kim, H.; O'Niel, D. & Kim, K. (GTE Labs., Inc., Waltham, MA (USA))
Partner: UNT Libraries Government Documents Department
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Fundamental study of ash formation and deposition: Effect of reducing stoichiometry. Quarterly report No. 2, 1 July 1993--30 September 1993

Description: The technical objectives of this project are: To identify the partitioning of inorganic coal constituents among vapor, submicron fume, and fly ash products generated during the combustion of pulverized coal under a variety of combustion conditions. Fuel lean and fuel rich combustion conditions will be considered. To identify and quantify the fundamental processes by which the transformations of minerals and organically-associated inorganic species occur. Emphasis will be placed on identifying a… more
Date: November 1, 1993
Creator: Helble, J. J.; Srinivasachar, S.: Wilemski, G.; Kang, S. G.; Sarofim, A. F.; Peterson, T. W.; Bool, L. E. et al.
Partner: UNT Libraries Government Documents Department
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Supramolecular Chemistry of Selective Anion Recognition for Anions of Environmental Relevance

Description: The major thrust of this project led by the University of Kansas (Prof. Kristin Bowman-Jones) entails the exploration of the principles of recognition and separation of sulfate by the design, synthesis, and testing of novel sulfate extractants. A key science need for the cleanup of tank wastes at Hanford has been identified in developing methods to separate those bulk waste components that have low solubilities in borosilicate glass. Sulfate has been identified as a particularly difficult and e… more
Date: September 22, 2005
Creator: Moyer, Bruce A.; Bostick, Debra A.; Fowler, Christopher J.; Kang, Hyun-Ah; Ruas, Alexandre; Delmau, Laetitia H. et al.
Partner: UNT Libraries Government Documents Department
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