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Free-convection effects on heat transfer for turbulent flow through a vertical tube

Description: Report presenting experimental heat-transfer data for the turbulent flow of fluids through stationary vertical tubes with both small and large length-to-diameter ratios compared for the case where the acceleration of gravity is opposite in direction to the mean velocity in the tube and where the heat flows from the tube wall into the fluid.
Date: December 1955
Creator: Eckert, E. R. G.; Diaguila, Anthony J. & Livingood, John N. B.
Partner: UNT Libraries Government Documents Department

Impingement of Water Droplets on a Sphere

Description: Droplet trajectories about a sphere in ideal fluid flow were calculated. From the calculated droplet trajectories the droplet impingement characteristics of the sphere were determined. Impingement data and equations for determining the collection efficiency, the area, and the distribution of impingement are presented in terms of dimensionless parameters. The range of flight and atmospheric conditions covered in the calculations was extended considerably beyond the range covered by previously reported calculations for the sphere.
Date: November 1955
Creator: Dorsch, Robert G.; Saper, Paul G. & Kadow, Charles F.
Partner: UNT Libraries Government Documents Department

The One-Dimensional Theory of Steady Compressible Fluid Flow in Ducts With Friction and Heat Addition

Description: "Steady, diabatic (nonadiabatic), frictional, variable-area flow of a compressible fluid is treated in differential form on the basis of the one-dimensional approximation. The basic equations are first stated in terms of pressure, temperature, density, and velocity of the fluid. Considerable simplification and unification of the equations are then achieved by choosing the square of the local Mach number as one of the variables to describe the flow" (p. 1).
Date: July 1947
Creator: Hicks, Bruce L.; Montgomery, Donald J. & Wasserman, Robert H.
Partner: UNT Libraries Government Documents Department

Fluid Flow Through Packed and Fluidized Systems

Description: From Introduction: "Examination of published correlations revealed that considerable uncertainty existed in the correlation of the operating variables of such equipment with the pressure drops which could be expected through packaged and fluidized systems; correlations proposed in the literature differed from each other frequently by as much as 75 to 100 percent. The following study was begun in 1946 to develop correlations that would be suitable for the design of new equipment in which fluids are brought into contact with granular materials."
Date: 1951
Creator: Leva, M.; Weintraub, M.; Grummer, M.; Pollchik, M. & Storch, H. H.
Partner: UNT Libraries Government Documents Department

Measurement of Fracture Aperture Fields Using Ttransmitted Light: An Evaluation of Measurement Errors and their Influence on Simulations of Flow and Transport through a Single Fracture

Description: Understanding of single and multi-phase flow and transport in fractures can be greatly enhanced through experimentation in transparent systems (analogs or replicas) where light transmission techniques yield quantitative measurements of aperture, solute concentration, and phase saturation fields. Here we quanti@ aperture field measurement error and demonstrate the influence of this error on the results of flow and transport simulations (hypothesized experimental results) through saturated and partially saturated fractures. find that precision and accuracy can be balanced to greatly improve the technique and We present a measurement protocol to obtain a minimum error field. Simulation results show an increased sensitivity to error as we move from flow to transport and from saturated to partially saturated conditions. Significant sensitivity under partially saturated conditions results in differences in channeling and multiple-peaked breakthrough curves. These results emphasize the critical importance of defining and minimizing error for studies of flow and transpoti in single fractures.
Date: May 6, 1999
Creator: Detwiler, Russell L.; Glass, Robert J. & Pringle, Scott E.
Partner: UNT Libraries Government Documents Department

A Computer Program for Calculating One-Dimensional Hydrodynamic Flow: KO Code

Description: A computer program is described for the solution of shock, detonation, and spall problems for one-dimensional linear, cylindrical, or spherical hydrodynamic flow. The Flume option is used for calculating flow- through arbitrary cross sections. (R.J.S.)
Date: July 2, 1962
Creator: Wilkins, M.; French, J. & Giroux, R.
Partner: UNT Libraries Government Documents Department

Results of a coupled fracture-flow test at the 0.5-m scale

Description: This report presents progress made on two experiments on 0.5-meter-scale blocks to determine thermohydromechanical (THM) behavior of fractured rock. We first present results for an experiment on sample SB3, including data for flow measurements through a horizontally oriented, artifical (saw-cut) fracture at a series of differential fluid pressures and temperatures under uniaxial stress conditions up to 14 MPa. We then present the experiment design and a progress report on the assembly of experiment SB4, flow through a vertically oriented fracture intersected by a line heat source.
Date: August 14, 1998
Creator: Costantino, M. S.
Partner: UNT Libraries Government Documents Department

A Combined Experimental and Computational Approach for the Design of Mold Topography that Leads to Desired Ingot Surface and Microstructure in Aluminum Casting.

Description: Solidification of Aluminum alloys is modeled on uneven surfaces characterized by sinusoidal curves. Wavelengths and amplitudes of these surfaces are varied to study the effect of changing surface topography on fluid flow, macrosegregation and inverse segregation in the solidifying alloy. Solidification is initiated by convective heat removal from the uneven surfaces and simulations are carried out in both vertical and horizontal configurations. Stabilized finite element methods, recently used for modeling solidification in the presence of shrinkage and buoyancy driven flows, are used to discretize and solve the governing transport equations derived by volume averaging. The effect of varying amplitudes and wavelengths is observed in heat transfer, fluid-flow, macrosegregation and inverse segregation processes. In vertical solidification, inverse segregation, that usually occurs at the bottom of the cavities, is studied for different sinusoidal topographies quantified by a particular wavelength and amplitude. The fluid flow here is driven by a combination of shrinkage and thermosolutal buoyancy. Shrinkage driven flow arises due to different densities of solid and liquid phases. During horizontal solidification of an Aluminum alloy from uneven surfaces, thermosolutal buoyancy plays a dominant role in fluid flow and the effect of shrinkage is neglected by assuming the individual phase densities to be equal. Convection in this case is much stronger than that in the vertical case and large scale redistribution of the solute element occurs. To measure variation in macrosegregation with changing surface topography, global extent of segregation and difference between maximum and minimum solute concentrations are calculated for different amplitudes and wavelengths. In both the cases, the main aim is to quantify changes in macrosegregation due to changing surface topography accomplished by varying amplitudes or wavelengths or both.
Date: August 8, 2005
Creator: Dr. Zabaras, N., Samanta, D.
Partner: UNT Libraries Government Documents Department