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Articles 1  22 of 22
FullText Articles in Engineering
Combined Thermal Weakening And Mechanical Disintegration Of Hard Rock, George Bromley Clark, T. F. Lehnhoff, Gary F. Fenton, M. R. Patel, Jaw K. Wang, Vernon Dale Allen
Combined Thermal Weakening And Mechanical Disintegration Of Hard Rock, George Bromley Clark, T. F. Lehnhoff, Gary F. Fenton, M. R. Patel, Jaw K. Wang, Vernon Dale Allen
Mining Engineering Faculty Research & Creative Works
This investigation of the combined effects of thermal weakening and mechanical disintegration (thermomechanical fragmentation) was initiated with a view toward better understanding of the processes required for more rapidly and economically fragmenting or excavating hard rock. Boring machines for utility tunnels, transportation tunnels or mining operations may be able to utilize the advantages of processes such as thermomechanical fragmentation. Secondary fragmentation or rock crushing processes also can conceivably employ the data obtained from this study.
Design And Preliminary Testing Of A Thermomechanical Rock Fragmentation Apparatus, Gary Earl Fenton
Design And Preliminary Testing Of A Thermomechanical Rock Fragmentation Apparatus, Gary Earl Fenton
Masters Theses
"The design characteristics of equipment to thermally weaken and mechanically fragment hard rock were developed and the apparatus constructed. An initial investigation of thermomechanical fragmentation was conducted on Missouri red granite. The particles from the fragmentation tests were sized and this analysis was used in the Rittinger theory to calculate surface area breakage energy. It was found that the application of thermal energy could reduce the surface area breakage energy per unit volume of material removed by as much as 41 percent. The use of kerfs in the rock increased the amount of material removed and permitted larger particles to ...
Development Of An ElasticPlastic Finite Element Program With The Initial Strain Approach, Vernon Dale Allen
Development Of An ElasticPlastic Finite Element Program With The Initial Strain Approach, Vernon Dale Allen
Masters Theses
"A finite element method is presented for solution of plane stress and axisymmetric elasticplastic problems employing the method of successive elastic solutions with the initial strain approach. The problem of nonconvergence of the initial strain approach for perfectly plastic problems was eliminated by expressing the PrandtlRuess equations entirely in terms of strain. Two examples are presented to demonstrate the validity of the method"Abstract, page ii.
The Thermal Contact Resistance Of Lubricant Films In Vacuum, Garry A. Heizer
The Thermal Contact Resistance Of Lubricant Films In Vacuum, Garry A. Heizer
Masters Theses
"This paper presents the results of an experimental investigation on the thermal contact resistance of lubricant films and bare interfaces. The apparatus and procedure used in the determination of these resistances are described. Twelve series of tests were performed to evaluate the effects of temperature and contact pressure on the thermal resistance of lubricant films. Variations of thermal contact resistance with temperature and contact pressure for four lubricants and for bare interfaces are presented graphically. The thermal resistances of the four lubricants tested in vacuum conditions: lithium grease, graphite grease, molykote grease, and silicone lubricant, were found to lie in ...
Feed Drive Design For Numerically Controlled Machine Tools, Subash Bhatia
Feed Drive Design For Numerically Controlled Machine Tools, Subash Bhatia
Masters Theses
"The various types of feed drive control systems used in numerical control of machine tools have been broadly classified. Further a step by step design has been presented for the feed drive of a numerical contouring control milling machine. The aim has been to develop a consistent strategy for tackling a variety of such problems. Consequently stress has been laid on principles and not on design figures"Abstract, page ii.
Laser Interferometric Holography Investigation Of Free Convection About A Vertical Plate Of NonUniform Temperature, Richard Kenneth Thomson
Laser Interferometric Holography Investigation Of Free Convection About A Vertical Plate Of NonUniform Temperature, Richard Kenneth Thomson
Masters Theses
"An experimental investigation was conducted using a holographic interferometer to detect the temperature variation in a free convection boundary layer about a vertical heated plate. The heated plate was nonisothermal and investigations were conducted for four temperature distributions; the maximum plate temperature ranged from 200F to 493F. Photographs were taken of the fringe patterns and boundary layer thickness measurements, as well as temperature measurements, were made. A theoretical model was constructed by applying the integral method to the energy and momentum equations. The experimental values agree quite well with this model. The advantages of the holographic interferometer over other systems ...
Design Of A SemiAutomatic Transmission, Yogendra Prahladray Buch
Design Of A SemiAutomatic Transmission, Yogendra Prahladray Buch
Masters Theses
"Design of a semiautomatic fourspeed transmission for automotive engines with moderate horsepower is described. The basic configuration consists of main and countershafts and five pairs of constantmesh gears. Engine torque is transmitted through an input gear pair to the countershaft, and finally to the output shaft through a selected output gear pair. Selection is accomplished by engaging one of five hydraulically operated clutches located on the countershaft. Engagement fixes the desired gear to the countershaft and engine torque is then transmitted to the mating gear, which is fixed to the output shaft. Fourth speed is obtained by coupling the input ...
An Investigation Of Subsequent Yield Phenomena, Joseph George Hoeg
An Investigation Of Subsequent Yield Phenomena, Joseph George Hoeg
Doctoral Dissertations
"A method utilizing high pressure fluid environments is described whereby a threedimensional subsequent yield surface was determined for 304 stainless steel. Cylindrical parent specimens of this material were prestrained in axial compression under fluid pressure and then small subspecimens were sectioned from these parent specimens. Finite element techniques were used to optimize the parent specimen size so that a zone of uniform axial stress would result during the prestraining. Longitudinal strains in this zone were monitored during the prestraining and the subspecimens were cut from this region in a manner that did not allow the machining to appreciably affect the ...
A Study Of Radiative Heat Transfer From A Spherical Layer, Hakimuddin Kalimuddin Khalil
A Study Of Radiative Heat Transfer From A Spherical Layer, Hakimuddin Kalimuddin Khalil
Masters Theses
"The problem of radiative heat transfer from a spherical layer of absorbingemitting gas has been studied. First, the medium is assumed to be gray and then nongray. A thorough survey of literature from fields other than heat transfer, such as astrophysics and neutron transport has been made to stimulate further interest in this important area. To gain some insight into the effect of various parameters on the heat transfer, simple physical situations involving isothermal medium are considered. Comparison of the results obtained for the flux from the spherical and planar layers reveal that the curvature becomes increasingly important as the ...
Two Component Heat Pipe, Surapol Chandsawangbhuvana
Two Component Heat Pipe, Surapol Chandsawangbhuvana
Masters Theses
"A two component heat pipe with water and ethanol as the working fluid was investigated at different angles of inclination and various ethanol concentration for two power loads. The heat pipe was 15 inches long and 0.75 inches in diameter with a 100 mesh stainless steel screen wick. The wall and the vapor temperatures were measured at different stations along the length of the heat pipe by copperconstantan thermocouples. The results were used to evaluate an existing model which includes the constraint of thermodynamic phase equilibrium of the solution on the governing equations. Based on the measured pressure and ...
Radiant Interchange In A NonIsothermal Rectangular Cavity, Tilak Raj Sawheny
Radiant Interchange In A NonIsothermal Rectangular Cavity, Tilak Raj Sawheny
Masters Theses
"Radiant interchange between nonisothermal, gray diffuse surfaces with nonuniform radiosity has been determined for a rectangular cavity. Temperature distribution and heat flux as thermal specifications for the parallel surfaces of the cavity have been considered separately. Ambarzumian's method has been used for the first time to solve a radiant interchange problem. According to the method, the integral equation for the radiosity is first transformed into an integrodifferential equation and then into a system of ordinary differential equations. Initial conditions required to solve the differential equations are the Hfunctions. The Hfunctions represent the radiosity at the edge of the cavity ...
A StepWise Gray Approximation Of The Radiative Absorption Coefficient For An Isothermal Hydrogen Plasma, Keith Harlan Browne
A StepWise Gray Approximation Of The Radiative Absorption Coefficient For An Isothermal Hydrogen Plasma, Keith Harlan Browne
Masters Theses
"The radiative absorption coefficient of an isothermal hydrogen plasma is calculated using a stepwise gray approximation. The approximation retains a high degree of accuracy while significantly reducing the numerical computer time. The accuracy of the approximation depends on the spacing of the steps taken in the frequency spectrum as well as the number or steps used; 135 steps are used in this study. Plasma conditions of interest in this study are for temperatures between 5000 and 60,000ºK, densities between 10⁻⁵ and 10⁻⁷ gm/cm³, and thicknesses between 0.1 and 100 cm. Flux and intensity calculations are ...
A Study Of A Nitrogen Heat Pipe, Jay Dudheker
A Study Of A Nitrogen Heat Pipe, Jay Dudheker
Masters Theses
"An experimental heat pipe, 33.25 inches long and 0.75 inches in diameter, with modacrylic fiber wick and liquid nitrogen as its working fluid was constructed to study the operating characteristics of a cryogenic heat pipe. The effective thermal conductivity and the axial temperature distribution were determined for various levels of power input. The effect of inclination angle on the above parameters was also measured"Abstract, page ii.
The Effect Of Diameter On The Film Boiling Behavior Of Liquid Nitrogen, William Joseph Wafer
The Effect Of Diameter On The Film Boiling Behavior Of Liquid Nitrogen, William Joseph Wafer
Masters Theses
"A film boiling heat transfer study was conducted for liquid nitrogen at atmospheric pressure. The heat transfer surfaces used were cylinders with outside diameters of 0.450, 0.650, 0.850, and 1.000 inches. The temperature differences covered were from approximately 150ºF to approximately 600ºF. The data indicate that the heat flux will decrease to a minimum then increase slightly as the diameter of the heat transfer element is increased at constant temperature difference. The heat transfer coefficient is expected to approach a flat plate correlation as the diameter approaches infinity"Abstract, page ii.
A Triangular Element For Numerical Solutions Of Axisymmetric Conduction Problems In Cylindrical Coordinates, Prafulla Chandra Mahata
A Triangular Element For Numerical Solutions Of Axisymmetric Conduction Problems In Cylindrical Coordinates, Prafulla Chandra Mahata
Masters Theses
"The triangular element is one of the many suitable elements which are used in finite difference methods as applied to conduction heat transfer. Such elements find many applications in conduction problems in Cartesian coordinates. This work proposes a new triangular element for axisymmetric conduction problems in cylindrical coordinates. The validity and workability of the networks formed by the proposed triangular elements are strengthened by selected examples. The work is completed by the application of the triangular element to an industrial problem having irregular boundaries. The results are compared with the solution obtained by the finite element method"Abstract, page ii.
An Experimental Determination Of The Effect Of The Axisymmetric Turbulent Wake On The Pressure Distribution On A Sphere, Martin Gardner Bowin
An Experimental Determination Of The Effect Of The Axisymmetric Turbulent Wake On The Pressure Distribution On A Sphere, Martin Gardner Bowin
Masters Theses
"A study of the effect of the turbulent wake of a water drop on the motion of a smaller droplet is essential in order to gain an understanding of the behavior associated with the collision coalescence phenomena. The use of spheres of macroscopic size proves to be a valuable method in observing these effects. This experimental investigation centers on (1) a check on the validity of the instrumented sphere as a device to measure normal static pressure, and (2) the study of the effect of the turbulent wake of the test model sphere upon the instrumented sphere. Measurements were made ...
The Influence Of Member Length On Thermal Contact Resistance In A Vacuum Environment, Larry Martin Cooper
The Influence Of Member Length On Thermal Contact Resistance In A Vacuum Environment, Larry Martin Cooper
Masters Theses
"An investigation was conducted to determine the influence of member length on thermal contact resistance in a vacuum environment. A model was created which consisted of a center rod axially loaded between two other members. It was assumed that circular macroscopic constriction areas were formed at the contact interface when the rods were loaded. Macroscopic modeling of the contact surfaces makes the thermal contact analysis a function of the mechanical and thermal boundary conditions of the total body. The method of finite differences was employed to calculate the temperature distribution, heat flows, and thermal contact resistance of each member. Data ...
Laminar Heat Transfer For Small Prandtl Number Fluids Including Step Change In Wall Temperature, Shiny Ting
Laminar Heat Transfer For Small Prandtl Number Fluids Including Step Change In Wall Temperature, Shiny Ting
Masters Theses
"The object of this investigation is to provide a simple means of determining the heat transfer from a flat plate which has an unheated leading length x₀. The case of steady, twodimensional, laminar flow of an incompressible fluid with a Prandtl number of less than one is considered. Since there exists an unheated length and the Prandtl number of the fluid is less than one, the thermal boundary layer intersects the flow boundary layer. Thus, the solution of the problem divides into two regions. In this study, the problem is solved analytically by employing the energy integral equation. The temperature ...
An Investigation Of A Bistable Oscillator Used In A Phase Modulated Control Circuit, YuFang Yen
An Investigation Of A Bistable Oscillator Used In A Phase Modulated Control Circuit, YuFang Yen
Masters Theses
"A primary component in the investigation of phase modulated control systems is bistable oscillator which converts a constant oscillation signal to control the system. The oscillator is feedback type that utilizes a feedback capacitance and resistance in each feedback path to change its frequency. The theoretical behavior of bistable oscillator was investigated and the nondimensional results were set for convenience in determining the oscillation period. The control circuit which based on the oscillator was also presented a form of suitable circuit for direct application to practical control problems"Abstract, page ii.
Use Of The Turbulence Kinetic Energy Equation In Analyzing Turbulent Near Wakes, James Edward Auiler
Use Of The Turbulence Kinetic Energy Equation In Analyzing Turbulent Near Wakes, James Edward Auiler
Doctoral Dissertations
"A general method is presented for analyzing turbulent flow fields in the near wake regions of twodimensional and axisymmetric bodies. The governing partial differential equations of continuity, momentum and turbulence kinetic energy are expressed in elliptic form in terms of the dependent variables stream function, vorticity and turbulence kinetic energy. An iterative finitedifference technique is used to solve the governing equations simultaneously. Numerical solutions are obtained for the following physical problems: 1. Laminar near wake: Only stream function and vorticity are considered for laminar flow. Solutions are compared with available analytical results for uniform flow over a sphere. 2. Turbulent ...
Identification Of Centers Of Influence For Urban Areas, Robert W. Meyer
Identification Of Centers Of Influence For Urban Areas, Robert W. Meyer
Doctoral Dissertations
"A method is developed for the identification of the spatial locations about which urban population densities tend to be distributed. The identification of these "influence centers" is based upon the use of available census data. The method is developed for application to any population characteristic which can be logically represented in terms of spatial density. Examples of such characteristics are; total population, population by race, and population by income group. The method is empirically developed and verified for restricted spatial distributions using artifically generated census tract information. These spatial distributions are compatiable with population distributions that are most readily modeled ...
Report On The School Of Mechanical Engineering National Technical Center Saigon, South Vietnam, Myrne R. Riley
Report On The School Of Mechanical Engineering National Technical Center Saigon, South Vietnam, Myrne R. Riley
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
"Training in the discipline of Mechanical Engineering is offered in South Vietnam by the School of Mechanical Engineering, one of four engineering schools and a Merchant Marine School composing the National Technical Center located presently in the Phu Tho region of Saigon, South Vietnam. The school was established in 1956 for the training of engineers, for mechanical and industrial activities. It became part of the National Technical Center, established by Decree No. 213Gd by the President of the Republic of Vietnam on June 29, 1957 and graduated the first class of 20 in the summer of 1960. The KS Degree ...