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Charges On Jet Drops Produced By Bursting Bubbles, Robert A. Medrow, B. T. Chao

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The sizes and charges of jet drops produced by bursting air bubbles are examined experimentally. The variation in charge for bubble lifetimes of up to 200 sec in NaCl and KCl solutions is reported. Jet drops refer to drops produced by a jet rising from a cavity left in a liquid surface by a bursting bubble; bubble lifetime is the interval during which a bubble is in motion between generation and rupture. With other variables held constant, drop charge shows a characteristic variation of a rise to a maximum followed by a decrease to an asymptotic value, as bubble lifetime …

Floating Bubble Configurations, Robert A. Medrow, B. T. Chao

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The configurations of bubbles floating at a vapor-liquid interface are investigated both analytically and experimentally. The differential equations governing the shape of a single bubble at rest in a liquid of infinite extent are deduced under the assumption of zero dome thickness, uniform surface tension, and equal gas densities within the bubble and above the interface. These equations show that nondimensional bubble shapes depend upon the value of a single parameter. An analytical solution, valid for small bubbles, is developed and shown to be in good agreement with the general numerical solution. Good agreement with theory is demonstrated for floating …

Heat Transfer From An Oscillating Horizontal Wire, Bassem F. Armaly, D. H. Madsen

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The effect of vibration on heat transfer by natural convection has been investigated experimentally using a thin wire, 0.010 in. in diameter, and air as a convection medium. Horizontal reciprocating motion of varying amplitudes, peak-to-peak values of 0-2.655 in., and frequencies, 0-20 cps, was applied to an electrically heated horizontal wire. The average wire velocity (frequency times total path length traveled per cycle by the wire) was used to correlate and predict the experimental results. © 1971 by ASME.

An Approximate Model For The Static Operation Of A Fluidic Amplifier Employing Axisymmetric Jets, Richard T. Johnson

Mechanical and Aerospace Engineering Faculty Research & Creative Works

An approximate mathematical model for the static, no-load (blocked receiver) operation of a fluidic amplifier employing axisymmetric jets is developed. The amplifier is similar in concept to the three-terminal modulator developed by the Johnson Service Co. The approach used in developing the model assumes that the complex flow phenomena can be represented by the combination of several elementary flow problems. The model employs the concept of an equivalent power nozzle in describing downstream flow with a control signal present. Experimental results are presented to justify assumptions and evaluate parameters. © 1971 by ASME.

Effects Of Molecular Characteristics Of Polymers On Drag Reduction, Gin‐Chain ‐C Liaw, Jacques L. Zakin, Gary Kent Patterson

Chemical and Biochemical Engineering Faculty Research & Creative Works

Turbulent measurements in capillary tubes and in pipes were made on nonpolar solutions of seven polymer species, three at more than one molecular weight, over wide concentration ranges. A critical concentration, Cc, was taken as the minimum concentration for disappearance of the turbulence transition region. Above this concentration, friction factor‐generalized Reynolds number data show only a gradual deviation from extension of the laminar line. Cc increases with tube diameter and decreases with molecular weight. The critical dimensionless volume friction Cc [η] is less dependent on molecular weight. The levels of Cc [η] for different polymer species in a given tube …

Organic Desorption From Carbon-I. A Critical Look At Desorption Of Unknown Organic Materials From Carbon, S. C. Allen, R. H. Pahl, Kenneth G. Mayhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Open-Channel Profiles By Newton's Iteration Technique, D. L. Fread, Terence E. Harbaugh

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Computation of surface profiles for steady gradually varied flow can be accomplished by use of Newton's Iteration Technique. The magnitude of error is controlled and the profile depth can be conveniently calculated at selected distances upstream or downstream from a control point. A Fortran IV program is provided for utilizing the technique in a trapezoidal channel. © 1971.

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 …

The Genesis Of Cellular Precipitation In Copper Rich Copper-Indium Alloys, Raymond Albert Fournelle

Doctoral Dissertations

"The morphology of cellular precipitation in a Cu-9.5at.%In alloy has been investigated by light and electron microscopy and x-ray and electron diffraction. Both cellular and general precipitation were observed to occur simultaneously in quenched and aged alloys while only cellular precipitation was observed to occur in isothermally aged alloys. Because of the presence of wide, vacancy depleted precipitate free zones in the vicinity of grain boundaries, general precipitation was observed to have no effect on the early development of cellular precipitation. Hence, the early development of cellular precipitation was found to be identical for both types of heat treatment. By …

Analysis Of Light Gage Steel Shear Diaphragms, Albert R. Ammar, Arthur H. Nilson

CCFSS Library (1939 - present)

INTRODUCTION: It has long been recognized by structural engineers, that light gage steel cladding floor and roof decking systems have a considerable stiffening and strengthening effect on building frameworks. The beneficial contribution of these diaphragm systems is most pronounced when the structure as a whole is subjected to loads which result in an in-plane shear action of the cladding. This occurs, for example, when the rigidity of a floor or roof diaphragm acting as a membrane is utilized to transmit lateral forces to stiff end walls. Another example of diaphragm action is found in pitched roof portal sheds under vertical …

Analysis Of Light Gage Steel Shear Diaphragms, Arthur H. Nilson

CCFSS Library (1939 - present)

A method is presented for the elastic analysis of shear diaphragms composed of standard light gage steel panels. A finite element approach is adopted, in which the mechanical properties of the diaphragm components are incorporated in an analytical model of the assemblage, using the direct stiffness method of matrix structural analysis. Results are compared against experimental values.

Sufficiency Conditions For Constrained Optima, Ju-Chang Huang, Robert M. Wellek

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Sufficiency conditions for constrained optimization problems were derived by the use of constrained second total derivatives. The results are in a simpler form than the Schechter and Beveridge relation. The sufficiency conditions of Phipps were corrected. © 1971, American Chemical Society. All rights reserved.

Detection Of Delay Time And Filtering Using Sequency Domain Technique, Earl F. Richards

Doctoral Dissertations

"A procedure is presented by which it is possible to detect a known signal of unknown delay in a noisy medium contaminated by noise. From the results the characteristics of a sequency digital filter which would be required to remove the noise contamination is indicated. The Walsh functions are discussed and the sequency domain, which is analogous to the continuous frequency domain, is used in the spectral analysis of signals. The binary nature of the Walsh functions and their ease of generation makes processing of signals easier than the Fourier analysis approach. The applications of fast forward and inverse Walsh …

The Analysis And Behavior Of Thin-Steel Hyperbolic Paraboloid Shells, Peter Gergely, P. V. Banavalkar, J. E. Parker

CCFSS Library (1939 - present)

An extensive experimental and analytical investigation of thin-steel hyperbolic paraboloid (hypar) structures was carried out to provide design information. As a result of this work, empirical data is provided regarding the behavior of such structures and computer programs are presented for the analysis of thin steel hypar structures. Hyperbolic paraboloid structures possess a unique combination of structural and architectural properties, some of them are the following 1) Due to the double curvature of the surface the internal stresses in the deck are generally low and the deflections are small. 2) Since a hyper surface can be generated by straight lines, …

Column Research Council: Proceedings 1971, Column Research Council

CCFSS Library (1939 - present)

One of the purposes of the Council is to maintain a forum where problems related to the design and behavior of columns and other compression elements in metal structures can be presented for evaluation and discussion. The Annual Technical Session provides opportunity to carry out this function. The 1971 Annual Technical Session was held on May 25 and 26 at the Pick-Rosseve1t Hotel in Pittsburgh, Pennsylvania. Seventy-seven persons attended the Session and twenty-two papers were delivered. A panel discussion on "Fire Effects on Structural Stability" was held in the evening of May 25. In conjunction with the Technical Session, an …

Analysis Of Light Gage Steel Shear Diaphragms, Albert R. Ammar, Arthur H. Nilson

CCFSS Library (1939 - present)

INTRODUCTION It has long been recognized by structural engineers, that light gage steel cladding floor and roof decking systems have a considerable stiffening and strengthening effect on building frameworks. The beneficial contribution of these diaphragm systems is most pronounced when the structure as a whole is subjected to loads which result in an in-plane shear action of the cladding. This occurs, for example, when the rigidity of a floor or roof diaphragm acting as a membrane is utilized to transmit lateral forces to stiff end walls. Another example of diaphragm action is found in pitched roof portal sheds under vertical …

Empirical Bayesian Learning, David R. Cunningham, Arthur M. Breipohl

Electrical and Computer Engineering Faculty Research & Creative Works

It is shown that a certain weighted average of the prior distribution and the empirical distribution yields an estimate of the posterior distribution that is consistent with Bayes' theorem. Acomparison of this approach and conventional parametric Bayesian estimation is made for some specific cases. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.

A Gamma-Level Portable Ring-Core Magnetometer, Stanley V. Marshall

Electrical and Computer Engineering Faculty Research & Creative Works

A four-transistor circuit is described for a battery-operated magnetometer that has 0.1 γ resolution using t-in diameter 4–79 or 6–81 Mo-Permalloy tape cores of 20–40 Mx capacity. The center-tapped drive winding also serves as the sense winding, simplifying the sensor assembly. Some signal-to-noise results are presented to illustrate the fairly wide difference that may exist between cores of the same cross section and to demonstrate the advantage of reducing core area. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.

A State Assignment Procedure For Asynchronous Sequential Circuits, Gary K. Maki, James H. Tracey

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a new procedure for constructing nonuniversal shared-row internal state assignments for asynchronous sequential circuits. The method consists basically of establishing an initial code with the minimum number of variables required to dis. © 1971, IEEE. All rights reserved.

Electrical Engineering Education In An Industrial Laboratory, J. Derald Morgan

Electrical and Computer Engineering Faculty Research & Creative Works

This paper describes a unique electrical engineering laboratory course. This laboratory is an example of industry-uni-versity cooperation in engineering education. The organization and operation of the course is outlined and explained. The educational benefits derived from such cooperation between industry and the university are briefly detailed. These benefits are extended to the students, the university, the faculty, and the participating industry. This paper provides the framework and challenge to industry from which other laboratory experiences can be conceived and developed. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.

Industry Participation In Electrical Engineering Education-Extra High Voltage Laboratory, J. Derald Morgan

Electrical and Computer Engineering Faculty Research & Creative Works

A unique electrical engineering laboratory course is described. This laboratory is an example of how industry can cooperate with universities in engineering education. The organization and operation of the course as well as the course material is outlined and explained, including the ways in which the industry participates in the operation of the laboratory. The educational benefits derived from such a cooperation between industry and the university are briefly detailed. These benefits are extended to the student, the University, the faculty, and the participating industry. This article provides the framework on which other laboratory experiences could be conceived and developed …

A Measurement Of Complex Viscosity With Large Amplitudes, Kuo-Shein Shen

Doctoral Dissertations

"In order to study the viscoelastic properties of polymer solutions and greases, a dynamic apparatus was built for making measurements of complex viscosity. Characteristic impedance was measured by a force transducer, an accelerometer and a phase meter. Large amplitudes to 0.5 inch can be obtained with this apparatus. The largest amplitude used was 1.27 x10⁻¹ cm. The frequency range was 30 Hz - 1500Hz. The lowest dynamic viscosity to be measured was 0.5 poise. In order to determine the capabilities of the instrument, complex viscosities of polymer solutions and greases were measured. The polymer solutions studied were polyisobutylene (PIB) L-80, …

An Experimental Study On Heat Transfer Coefficient For Carbon Laden Gas, Jacob Chi-Kwong Huang

Chemical and Biological Engineering ETDs

Abstract

A complete carbon black pilot plant was employed in this study. Carbon laden gas was produced in a fur­nace and introduced into the outer pipe of a heat ex­changer. Air, at the same time, was introduced into

the inner pipe of the heat exchanger cocurrently with the carbon laden gas. Thus, heat, with temperature dif­ference as driving force, would transfer from the car­bon laden gas to the air stream. The temperatures along the two streams were measured by iron-constantan ther­mal couples and recorded by a multi-reading temperature

recorder. Air supply and fuel (C3H8) supply were intro­duced into the furnace …

Preparation Of Metallic Oxide Aerosols By Vaporization And Degradation Of Organic Compounds, Tom B. Larsen

Chemical and Biological Engineering ETDs

Simple, dependable methods for the generation of aerosols are necessary to many forms of research. Specifically inhal­ation research has a requirement for sub-micron sized insoluble particles.

Two different methods for the production of oxide aerosols from vaporizable compounds were tried. The first method, a mod­ification of the Rapaport-Weinstock generator (R3), consisted of nebulization of a solution into a droplet mist. Next the drop­lets were vaporized, and condensation nuclei formed from the nonvaporizable impurities in the solution. The vapor was allowed to condense on the nuclei in a relatively large chamber, then the resulting liquid droplet aerosol was dried and converted …

A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane - Nitrogen - Helium System, Promod Kumar Taneja

Masters Theses

"The volumetric data for methane, nitrogen, and helium mixtures have been determined experimentally at low temperatures (60ºF to -30ºF) over a pressure range of 1000 to 5000 psig. An attempt has been made to show that the extension of standard techniques viz, "The Law of Corresponding States" for predicting the compressibility factors of pure hydrocarbons and hydrocarbon mixtures is not adequate for mixtures containing even very small amounts of helium. The deviation from the computed compressibility factors is found to be maximum at low temperatures and high pressures (up to 22%) for the mixtures studied"--Abstract, page ii.

Ladder Network Transfer Function Characteristics, Thomtavanit Hatayodom

Masters Theses

"This thesis investigates the network characteristics and synthesis procedure previously developed. As a result of this investigation, location of the absolute minimum values of Navot's method is determined; a procedure is given for obtaining more desirable component values for a given ladder network without changing its transfer function; a procedure is given for obtaining the source location in a ladder network that yields the desired numerator degree of its transfer function; and a computer program for helping to obtain the above result is presented"--Abstract, page ii.

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.

A Method For Studying Sequential Faults On A Three Phase Distribution Transformer, Shashi Kant Pandey

Masters Theses

"A method has been presented for studying sequential faults on opposite sides of a three-phase distribution transformer using the theory of symmetrical components and Alpha, Beta, and Zero components of three-phase systems. The effect of the faults on the distribution system has also been analyzed and improvements in the protection scheme suggested. The sequential faults occurred, one after the other, on the distribution system of the Central Electric Power Cooperative of Jefferson City in the state of Missouri resulting in a double unbalanced fault condition. The data used in the example problem has been supplied through the courtesy of the …

The Design Of A Lightning Data Interface, Larry Lee Hosto

Masters Theses

"A system for the processing of lightning stroke location data has been designed. The system will be used for studying the correlation of lightning and thunderstorm precipitation. The lightning stroke location system has been developed to gain further information about the cause-effect relationship between lightning stroke activity and thunderstorm precipitation. The system will consist of an analog computational network to find the tangent of the azimuth of the lightning stroke, an analog-to-digital converter, and a computer program which will process and store data on magnetic tape. This paper will discuss the design of the analog computational network and the computer …

Normal Mode Method Applied To The Transient Longitudinal Vibrations Of A Finite Rod With Material Damping And Viscoelastic Dispersion, David Arthur Levene

Masters Theses

"Longitudinal vibrations of a finite rod with material damping and frequency dependent material properties are examined. The normal mode method is used to investigate the transient response of a rod which is free to move in the longitudinal direction and is subjected to a transient longitudinal loading condition at one end. The equations of motion are derived and solved using both the differential equations approach and the energy methods approach of the normal mode method. The effects of material damping and frequency dependent material properties are considered by formulating the stress-strain relation for the material such that the modulus of …