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Micro-scale mass-transfer variations during electrodeposition

Description: Results of two studies on micro-scale mass-transfer enhancement are reported: (1) Profiled cross-sections of striated zinc surfaces deposited in laminar channel flow were analyzed with fast-fourier transforms (FFT) to determine preferred striation wavelengths. Striation frequency increases with current density until a minimum separation between striae of 150 {mu}m is reached. Beyond this point, independent of substrate used, striae meld together and form a relatively smooth, nodular deposit. Su… more
Date: August 1, 1991
Creator: Sutija, D.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Numerical analysis of laminar forced convection in a spherical annulus

Description: Calculations of steady laminar incompressible fluid-flow and heat transfer in a spherical annulus are presented. Steady pressures, temperatures, velocities, and heat transfer coefficients are calculated for an insulated outer sphere and a 0/sup 0/C isothermal inner sphere with 50/sup 0/C heated water flowing in the annulus. The inner sphere radius is 13.97 cm, the outer sphere radius is 16.83 cm and the radius ratio is 1.2. The transient axisymmetric equations of heat, mass, and momentum conser… more
Date: July 21, 1980
Creator: Tuft, D.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Three-dimensional temperature history of a multipass filled weldment. Part 2. [HEATINGS]

Description: Computer simulation of the three-dimensional temperature history in a multipass filled weldment was attempted by modifying a transient heat transfer code, HEATING5. The model includes temperature-dependent physical parameters, radiation and convection heat losses, turbulent and laminar convection in the molten pool, and variable arc velocity, intensity, and weld geometry. The model requires approximately 28 CPU min to simulate one second of welding. 15 figures, 8 tables.
Date: December 21, 1976
Creator: Pinkowish, J.A. & Whitman, P.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental two-phase liquid--metal magnetohydrodynamic generator program. Annual report, August 1975--September 1976

Description: The revised ambient-temperature NaK-nitrogen facility is described. The maximum liquid flow rate and generator inlet pressure are 10.9 kg/s 200 gpm) and 1.48 MP/sub a/ absolute (200 psig), respectively, compared with the previous values of 6 kg/s (110 gpm) and 0.72 MPa absolute (90 psig). Satisfactory loop operation has been obtained, and new experiments with the second diverging-channel generator were completed. The principal experimental results were a higher power density for the same genera… more
Date: September 1, 1977
Creator: Petrick, M.; Fabris, G.; Pierson, E. S.; Carl, D. A.; Fischer, A. K. & Johnson, C. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improvement and Verification of Fast Reactor Safety Analysis Techniques. Progress Report, October 1, 1979-March 31, 1980. [Lmfbr]

Description: Several of the time dependent properties of the dimethyl sulfoxide-acetyl chloride reaction system were determined. The volume of a wax cylinder melted by conducting a dimethyl sulfoxide-acetyl chloride reaction in the vessel was compared with the melted volume calculated using several different heat transfer correlations. It was found that a laminar flow at the wall model provided the most accurate calculation of the observed melted volume.
Date: January 1, 1980
Creator: Barker, D. H. & Wiberg, D. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Catalyzed combustion in a flat plate boundary layer. II. Numerical calculations

Description: A computer program has been developed to solve the boundary layer equations for laminar flow over a heated plate with H/sub 2//air combustion. The objectives are to investigate the importance of homogeneous as opposed to catalytic surface reactions during the combustion process, and to determine the roles of heat and mass transfer and their effect on combustion. Results are presented for combustion of H/sub 2//air at an equivalence ratio of 0.1 for flow over a noncatalytic plate at a surface te… more
Date: September 1, 1977
Creator: Schefer, R. & Robben, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis, scientific computing and fundamental studies in fluid mechanics

Description: Progress is reported on work in the following areas: vortex dynamics and turbulence, fingers and bubbles in Hele-Shaw cells and unbounded fluid, vortex reconnection, pattern selection in solidifying systems, Richtmyer-Meshkov instability, Wavy-Taylor vortex flows, high reynolds number laminar flows, and lastly numerical analysis and dynamical systems. (GHH)
Date: January 1, 1991
Creator: Keller, H.B. & Saffman, P.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Validity of cubic law for fluid flow in a deformable rock fracture. Technical information report No. 23

Description: The validity of the cubic law for laminar flow of fluids through open fractures consisting of parallel planar plates has been established by others over a wide range of conditions with apertures ranging down to a minimum of 0.2 ..mu..m. The law may be given in simplified form by Q/..delta..h = C(2b)/sup 3/, where Q is the flow rate, ..delta..h is the difference in hydraulic head, C is a constant that depends on the flow geometry and fluid properties, and 2b is the fracture aperture. The validit… more
Date: October 1, 1979
Creator: Witherspoon, P.A.; Wang, J.S.Y.; Iwai, K. & Gale, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Target design optimization for an electron accelerator driven subcritical facility with circular and square beam profiles.

Description: A subcritical facility driven by an electron accelerator is planned at the Kharkov Institute of Physics and Technology (KIPT) in Ukraine for medical isotope production, materials research, training, and education. The conceptual design of the facility is being pursued through collaborations between ANL and KIPT. As part of the design effort, the high-fidelity analyses of various target options are performed with formulations to reflect the realistic configuration and the three dimensional geome… more
Date: October 30, 2008
Creator: Gohar, M. Y. A; Sofu, T.; Zhong, Z.; Belch, H.; Naberezhnev, D. & Division, Nuclear Engineering
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Origin of Scale-Dependent Dispersivity and Its Implications For Miscible Gas Flooding

Description: Dispersive mixing has an important impact on the effectiveness of miscible floods. Simulations routinely assume Fickian dispersion, yet it is well established that dispersivity depends on the scale of measurement. This is one of the main reasons that a satisfactory method for design of field-scale miscible displacement processes is still not available. The main objective of this project was to improve the understanding of the fundamental mechanisms of dispersion and mixing, particularly at the … more
Date: September 30, 2008
Creator: Bryant, Steven; Johns, Russ; Lake, Larry & Harmon, Thomas
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral dissolution kinetics at the pore scale

Description: Mineral dissolution rates in the field have been reported to be orders of magnitude slower than those measured in the laboratory, an unresolved discrepancy that severely limits our ability to develop scientifically defensible predictive or even interpretive models for many geochemical processes in the earth and environmental sciences. One suggestion links this discrepancy to the role of physical and chemical heterogeneities typically found in subsurface soils and aquifers in producing scale-dep… more
Date: May 24, 2007
Creator: Li, L.; Steefel, C.I. & Yang, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Temporal Entropy Generation in the Viscous Layers of Laterally-converging Duct Flows

Description: Since insight into entropy generation is a key to increasing efficiency and thereby reducing fuel consumption and/or waste and -- for wall-bounded flows -- most entropy is generated in the viscous layer, we examine the transient behavior of its dominant contributor there for a non-canonical flow. New measurements in oil flow are presented for the effects of favorable streamwise mean pressure gradients on temporal entropy generation rates and, in the process, on key Reynolds-stress-producing eve… more
Date: December 1, 2008
Creator: McEligot, Donald M.; Brodkey, Robert S. & Eckelmann, Helmut
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conjugate heat transfer analysis using the Calore and Fuego codes.

Description: Full coupling of the Calore and Fuego codes has been exercised in this report. This is done to allow solution of general conjugate heat transfer applications that require more than a fluid flow analysis with a very simple conduction region (solved using Fuego alone) or more than a complex conduction/radiation analysis using a simple Newton's law of cooling boundary condition (solved using Calore alone). Code coupling allows for solution of both complex fluid and solid regions, with or without t… more
Date: September 1, 2007
Creator: Francis, Nicholas Donald, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydraulic testing of simulated DWPF waste slurries at the Georgia Iron Works Hydraulic Laboratory

Description: Pipeline tests of current simulations of Defense Waste Processing Facility (DWPF) waste slurries were performed during August 1982 at the Georgia Iron Works Hydraulic Laboratory (GIW). Measurements of pressure gradient versus flow in 3-inch pipes and fittings were made for various concentrations of unformated sludge and formated sludge with frit. All slurries were shown to behave generally as Bingham Plastic fluids. Formated sludge/frit slurries behaved generally like unformated sludge slurries… more
Date: December 31, 1982
Creator: Lewis, D.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculation of laminar incompressible fluid flow and heat transfer during spherical annulus filling

Description: A method of computing laminar incompressible fluid-flow and heat transfer during the filling of a spherical annulus is presented. Transient fluid temperatures and heat flux rates in the spherical annulus are calculated for an insulated outer sphere and a constant temperature inner sphere with heated water filling the annulus from the bottom. To achieve a solution, laminar axially symmetric flow is assumed and the Marker-and-Cell (MAC) free surface computational method is applied to this problem… more
Date: April 1, 1979
Creator: Tuft, D.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Application of COBRA*GCFR to the CFTL bundle

Description: A thermal-flow analysis of a proposed GCFR fuel bundle is presented for two flow regimes: laminar and turbulent. The ORNL version of the subchannel analysis code COBRA*GCFR, a modification of COBRA-IV-1 for helium coolant and artificially roughened surfaces, was used. Large temperature gradients across the edge rods were calculated for both flow regimes, indicating that the design is deficient.
Date: January 1, 1979
Creator: Conklin, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A theoretical analysis of vertical flow equilibrium

Description: The assumption of Vertical Flow Equilibrium (VFE) and of parallel flow conditions, in general, is often applied to the modeling of flow and displacement in natural porous media. However, the methodology for the development of the various models is rather intuitive, and no rigorous method is currently available. In this paper, we develop an asymptotic theory using as parameter the variable R{sub L} = (L/H){radical}(k{sub V})/(k{sub H}). It is rigorously shown that present models represent the le… more
Date: January 1, 1992
Creator: Yortsos, Y.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flow near the outlet of a geothermal energy reservoir

Description: Steady, incompressible flow converging radially between two stationary, parallel plates was investigated both numerically and experimentally. Flow ranges investigated were laminar, turbulent, and transitional. For laminar flows at dimensionless radii (2r..sqrt pi nu../Qt) much greater than one the velocity profile becomes parabolic and invariant. At radii less than one a boundary layer character evolves with an approximately uniform core region and the boundary layer thickness decreases from on… more
Date: July 1, 1979
Creator: Murphy, H.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flame Fronts With Complex Chemical Networks

Description: For laminar flame fronts with general complex chemistry networks, we present a systematic method to reduce the detailed chemistry in the limit of high-activation-energy asymptotics. We detail the method on a global multistep hydrocarbon model. Generic flame profile structures are discussed, and extensions to networks with zero activation energies are outlined.
Date: January 1, 1983
Creator: Fife, P. C. & Nichols, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Gas-driven fracture propagation

Description: A one-dimensional gas-flow drives a wedge-shaped fracture into a linearly elastic, impermeable half-space which is in uniform compression, sigma/sub infinity/, at infinity. Under a constant driving pressure, p/sub 0/, the fracture/flow system accelerates through a sequence of three self-similar asymptotic regimes (laminar, turbulent, inviscid) in which the fracture grows like an elementary function of time (exponential, near-unity power, and linear; respectively). In each regime, the transport … more
Date: October 1, 1981
Creator: Nilson, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Computational model for optimizing longitudinal fin heat transfer in laminar internal flows

Description: Optimal configurations are identified, based on a numerical model, for fully developed laminar internal flows whose base boundary walls have perpendicular fins extending longitudinally into the fluid. The optimum coolant flow channel, formed between each fin, has an aspect ratio dependent on the coolant to wall thermal conductivity ratio and on the fin to channel width ratio, which is optimally about unity. A base thickness exists which minimizes the base hot-spot temperature, and its value is … more
Date: November 1, 1990
Creator: Landram, C. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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VNAP2: a computer program for computation of two-dimensional, time-dependent, compressible, turbulent flow

Description: VNAP2 is a computer program for calculating turbulent (as well as laminar and inviscid), steady, and unsteady flow. VNAP2 solves the two-dimensional, time-dependent, compressible Navier-Stokes equations. The turbulence is modeled with either an algebraic mixing-length model, a one-equation model, or the Jones-Launder two-equation model. The geometry may be a single- or a dual-flowing stream. The interior grid points are computed using the unsplit MacCormack scheme. Two options to speed up the c… more
Date: August 1, 1981
Creator: Cline, M.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental studies of friction and heat transfer in enhanced passages

Description: The objectives of this research are two-fold; one is to carry out an extensive experimental investigation of pressure drop and heat transfer for internally enhanced passages in laminar, transitional and turbulent flow. The laminar and transition regions have received very meager treatment in the past. In addition to the effects of Reynolds number and the geometric characteristics of the enhanced surfaces, a comprehensive investigation of the effect of fluid properties, which is usually expresse… more
Date: March 1, 1992
Creator: Obot, N.T.; Esen, E.B. & Das, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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