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in subjects: "Temperature Gradients"  
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450/sup 0/F step transient thermal analysis of the LOFT pressurizer surge and spray line piping

Description: The LOFT pressurizer spray and surge line piping was analyzed for a 450/sup 0/F step change in fluid temperature. This transient was chosen to conservatively represent several pressurizer operating transients that had not previously been analyzed. These include temperature transients resulting from a 300/sup 0/F ..delta..T between pressurizer temperature and cold leg temperature, injection of a cooled (70/sup 0/F) slug of stagnant fluid into the hot (540/sup 0/F) spray line piping, and inflow o… more
Date: July 7, 1977
Creator: Tolan, B.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of Percent On-Cell Reformation of Methane in SOFC Stacks: Thermal, Electrical and Stress Analysis

Description: This report summarizes a parametric analysis performed to determine the effect of varying the percent on-cell reformation (OCR) of methane on the thermal and electrical performance for a generic, planar solid oxide fuel cell (SOFC) stack design. OCR of methane can be beneficial to an SOFC stack because the reaction (steam-methane reformation) is endothermic and can remove excess heat generated by the electrochemical reactions directly from the cell. The heat removed is proportional to the amoun… more
Date: April 7, 2006
Creator: Recknagle, Kurtis P.; Yokuda, Satoru T.; Jarboe, Daniel T. & Khaleel, Mohammad A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Inversion approach for thermal data from a convecting hydrothermal system. Revision 1

Description: Hydrothermal systems are often studied by collecting thermal gradient data and temperature-depth curves. These data contain important information about the flow field, the evolution of the hydrothermal system, and the location and nature of the ultimate heat sources. Thermal data are conventionally interpreted by the ''forward'' method; the thermal field is calculated based on selected initial conditions and boundary conditions such as temperature and permeability distributions. If the calculat… more
Date: June 7, 1985
Creator: Kasameyer, P.; Younker, L. & Hanson, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Examples of the changes in temperature, pressure and flow following a reactor power surge

Description: While it is obvious that a power surge in a Hanford reactor will result in temperature increases of the fuel and water, it is also true that there will be changes in the coolant flow rate and the pressures in each process tube. In addition, if the power increase is of sufficient magnitude, a self-induced flow reduction will occur as a result of pressure changes due to boiling within the process tube. The relations between power, temperatures, flow and pressure following a power surge are diffic… more
Date: June 7, 1962
Creator: Kreiter, M. R. & Batch, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Central Calorimeter Thermal Gradient Module Connection Analysis

Description: Two 20 kW condensing and one 10 kW steady state cooling coils will be used to cool and condense gaseous argon in the Central Calorimeter (CC) Cryostat. Since this cool down (300K to 90K) will inevitably cause shrinkage in the modules contained inside the cryostat, the connections between the modules have to be designed to withstand the increase in forces and moments induced by this contraction. This paper presents finite element analysis (ANSYS{reg_sign}) results to aid in the design or modific… more
Date: August 7, 1987
Creator: Rudland, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulations of Target Interactions with Pulsed High Energy Solid State Lasers

Description: In a solid-state heat capacity laser (SSHCL), waste heat is stored in the lasing slabs, minimizing temperature gradients and optical distortions. After the maximum number of pulses is reached, the slabs are cooled or rapidly exchanged with cool slabs. During the past several years, our laboratory at LLNL has built a number of SSHCLs, demonstrating powers beyond 10 kW. In this paper, we model target interactions produced by a 10 kW device (500 J/pulse and 20 Hz), operating at a wavelength of 1.0… more
Date: May 7, 2004
Creator: Boley, C & Rubenchik, A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stellar Opacity

Description: The monochromatic opacity, {kappa}{sub v}, quantifies the property of a material to remove energy of frequency v from a radiation field. A harmonic average of {kappa}{sub v}, known as the Rosseland mean, {kappa}{sub R}, is frequently used to simplify the calculation of energy transport in stars. The term ''opacity'' is commonly understood to refer to {kappa}{sub R}. Opacity plays an important role in stellar modeling because for most stars radiation is the primary mechanism for transporting ene… more
Date: November 7, 1999
Creator: Rogers, F J & Iglesias, C A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Temperature measurements on a HSLA-100 steel confinement vessel

Description: Temperature measurements have been made on HSLA-100 steel confinement vessel number 6-2-3-1. These measurements are intended to give a view of the vessel temperature response under conditions similar to operational conditions, starting from worst case. The vessel`s temperature must be above the minimum operating temperature when used to contain an explosive event to ensure that the vessel material has the desired crack arrest properties. Several series of temperature measurements have been cond… more
Date: May 7, 1998
Creator: Lohsen, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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