Engineering Commons^™

The Relation Of Heat Transfer To Power Consumption Of Liquids In Turbulent Flow, John D. Bien

Theses

The relationship between the heat transfer ability and the power input requirement of liquid coolants in a turbulent heat transfer condition was investigated. A correlation in terms of the liquid physical properties and the required volumetric flow was proposed and the use of this correlation in selection of liquids as coolant was discussed. The optimum condition for a high heat transfer/power input ratio was also discussed.

Phosphate Removal From Sewage Using A Combination Of Ferric Chloride And A Polymeric Flocculant, Ravindra C. Patel

Theses

The present work is concerned with a newer technique and approach to the problem of phosphate removal from waste water. This includes the removal of phosphate from the sample of activated sludge, i.e., a sample from the aeration tank of the secondary sewage treatment. The phosphate is removed by using ferric chloride as a precipitating agent and a cationic polyelectrolyte (P.E.) as a flocculating agent. Results of this study showed that: (a) P.E. addition gives a significant improvement in phosphate removal over that obtained by ferric chloride alone. In some cases the phosphate removal increased from 92 to 96.5 per …

The Transferability Of Force Constants Among Olefins, John Martin Comerford

Theses

A normal coordinate analysis of the in-plane vibrations of ethylene was performed using a modified valence force field, a modified Urey-Bradley force field and a hybrid orbital force field. The B_2u species of isobutene was also analyzed. An attempt was made to transfer force constants from ethylene and thereby solve the A₁ species of isobutene, but a solution could not be obtained. This suggests that simple transference of force constants is not feasable in this case.

The potential energy distributions obtained for ethylene are discussed. The normal coordinates calculated in this work are appended.

A Modified Redlich-Kwong Equation For Nonpolar And Slightly Polar Gases, David G. Skamenca

Theses

The PVT prediction capability of the Redlich-Kwong equation is substantially improved through the use of a generalized correlation based on the acentric factor. No experimental data is required to obtain the improved constants. Only the acentric factor and the critical properties of the pure gas are needed. The correlation of improved constants is limited to non-polar and slightly polar pure gases and mixtures in the supercritical temperature range.

The correlation applies to a reduced temperature range 1.00 le; T_R le; 1.60 and a reduced pressure range of 0.030 le; P_R le; 3.00. The correlation reduces deviations by as …

A Simplification Heuristic For Large Flow Tables, R. J. Smith, James H. Tracey

Electrical and Computer Engineering Faculty Research & Creative Works

Flow tables specifying large asynchronous sequential circuits often contain more internal states than are required to specify desired circuit behavior. Known minimization techniques appear unsuited for reduction of such large (rows X columns > 250) flow tables, because of excessive computation and intermediate data requirements for problems of this size. The algorithm described here is intended to rapidly produce a simplified-but in general non-minimal-flow table. It is most economical when applied to extremely large tables and was devised primarily for automated design applications. The procedure has been programmed in PL/1 and has been incorporated into an asynchronous sequential circuit design automation …

Production Attachment For Wood Turning, Julian A. Olson

Graduate Research Papers

As an industrial arts instructor for the short period of three years the writer has recognized a definite shortcoming in his instruction of the woodworking lathe. Instruction related to the woodworking lathe by the conventional "hand tool" methods is most important in leading to the students' understanding of basic turning ideas. This instruction, however, falls short of providing an up-to-date picture of the woodworking lathes used by industry.

As a means of overcoming this problem, the writer undertook the study of lathes as a project for the course, "Projects in Industrial Arts". This research provided information necessary in the construction …

Plastics: Mold Design And Fabrication, Duane H. Rippe

Graduate Research Papers

Students have often asked if additional molds were available which would make different objects other than golf tees. Literature provided with the injection molder described several methods of mold construction which could be fabricated in the school shop. The writer considered the possibility of making another mold, however, a time factor and limited experience prohibited construction.

The problem seemed to be appropriate for the Projects Course 33:270 at the University of Northern Iowa. The course and research involved would assimilate the needed information to construct a mold and to teach plastic injection mold construction more effectively.

The Microstructure Of Hardened Gypsum Pastes, Raafat Ishak Abdel Malek

Archived Theses and Dissertations

No abstract provided.

Temperature Protection For Fruit Trees By Air-Supported Plastic Structures, Ram T. Gadhavi

Theses and Dissertations

The greatest weather enemy in all fruit destruction is the late spring frost which moves across the country under the high pressure areas that are occasionally seen on the weather maps, and kills the fruit buds.

Traps And Trap Distribution In Commercial Zinc Sulphides Phosphors Silver Activated And Poisoned With Cobalt, Zohra Safinaz El Calamawy

Archived Theses and Dissertations

No abstract provided.

Switching Characteristics Of Calcium Borate Glasses Containing Iron, Mahmoud Aly El Hamamsy

Archived Theses and Dissertations

No abstract provided.

A Comparative Study Of The Inorganic Composition In Body Fluids Of Four Egyptian Tick Species, Samir Fouad Araman

Archived Theses and Dissertations

No abstract provided.

Particle Dynamics In The Mixing Of A Particle-Laden Stream With A Secondary Stream In A Duct, William Doyle Cranney

Theses and Dissertations

The purpose of this thesis is to review the history and discuss the present work being done in particle-gas flow, with application to air- augmentation of a particle-carrying, fuel-rich gas jet. A drawing of the model considered is shown in Figure 1, with the area of interest labeled. The thesis is intended as a thorough literature review and analysis.

Determination Of Effective Strain For The Strainhardening Of Aluminum Subjected To Completely Reversed Strain Combinations, Navin M. Patani

Theses and Dissertations

It is known that subrecrystallization plastic deformation increases the strength of a metal. The amount of strengthening that may be acquired can be approximated using a strainhardening equation and a simple given strain. The purpose of this thesis was to determine the effective strain for predicting strainhardening for annealed aluminum subjected to completely reversed strain combinations.

A Survey Of Literature On The Pyrolysis Of Wood And Other Cellulosic Solids, Kenneth P. Sasine

Theses and Dissertations

The study of the ignition of wood and other cellulosic materials has resulted in the publication of a large amount of literature. As an aid in the planning and interpretation of future research, it was felt that a survey of a representative body of literature should be made. With this as its motivation, the present work was initiated.

Triaxial Stress Effects In Weldments Associated With The Heat Affected Zone, Rohit A. Mehta

Theses and Dissertations

The welding of steel occupies an important place as a major fabricating process in industry. The welding of steel has been a subject of research for many years, and much information has been obtained about the strength of weldments.

Wood Flour Molding, Charles Reed Snyder

Graduate Research Papers

The purposes of this research are briefly stated in the following:

1. Develop an understanding of the values of an industrial process through the use of raw materials and laboratory equipment.

2. Investigate wood flour molding and its relation to industry.

3. Experiment with materials, laboratory equipment, and wood flour mixtures to produce a molded article.

4. Develop an instructional unit for use in an industrial arts curriculum.

A Feasibility Study Of The Application Of Bondgraph Modeling And Computerized Nonlinear Model Parameter Identification Techniques To The Cardiovascular System, Randall L. Taylor

Theses and Dissertations

Recent years have witnessed an increasing trend for people in the medical and engineering professions to couple their talents in a more united effort to better understand the functioning of the human body. This union of technologies has meant the introduction of new viewpoints and techniques in the field of physiological research. The engineers' basic tool, mathematical modeling, has perhaps been one of the most noticeable additions. There has been a significant amount of work done in recent years along these lines of deriving mathematical models to express the functioning of a subsystem of the body, and then, using analog, …

An Investigation Of A Computer Technique For Determining The Characteristic Parameters Of A Viscoelastic Model With Hysteresis Effects From Transient Experimental Data, Stephen Jack Clark

Theses and Dissertations

The object of this work was to develop a computer technique for determining the characteristic parameters of spring-mass system with hysteresis effects from transient experimental data. The technique was intended to be utilized to determine the parameters of models of systems where complex geometry and rate dependent properties would make a determination of the model parameters most difficult, and where the parameters typically obtained from static test would not characterize the rate dependent properties accurately.

Non-Linear Analysis Of Electrocardiogram Tracings In Detection Of Occult Coronary Artery Disease, Joseph Robert Levitt

Dissertations

The general problem of identifying significant characteristics of a system by analyzing the properties of a signal emitted by that system is common to many disciplines, biological as well as physical. In general, achievement of a satisfactory solution depends on the capability of assigning membership of candidate signals to one of a number of mutually exclusive categories:

In this study, a new technique of processing the standard electrocardiograms from human subjects has been developed. This technique employs a set of non-linear transformations which enable the assignment of electrocardiograms into one of two Mutually exclusive categories. The first category is that …

Extension And Application Of The Sedov-Berdichevskii Variational Principle, Francis X. Prendergast

Dissertations

The Sedov-Berdichevskii variational principle is extended, and this extended principle is employed in the construction of a shell theory.

The extension of the principle is accomplished by the use of Lagrangian multipliers, and a redefinition of terms in order to maintain the original generality of the principle. The Euler equations of the extended variational principle provide, in addition to those obtained in the original principle, elastic and plastic kinematic relations, and, elastic and plastic constitutive relations. Also, the Euler equations of the original principle are obtained in a physically more meaningful form. Examples are given which show how this principle …

Reliability Aspects Of Semiconductor Surface Protective Coatings, Robert Edward Mcmillan

Dissertations

This research was directed towards the occurrence and im-portance of surface leakage in reverse biased semiconductor diodes and the relation of this leakage to the reliability of a device under use conditions. As a result of this study, it is possible to predict one important leakage mechanism after such back-biased diode units have been subjected to long periods of temperature and humidity. This theory is consistent with tests of commercially available units, some of which have very slight surface leakage and others very large surface leakage.

Further, the usefulness of various possible passivating coatings is critically analyzed on the basis …

Dynamic Stress Concentrations About An Epilliptical Discontinuity In An Elastic Solid, Kenneth Roy Schroll

Dissertations

The redistribution of dynamic stresses caused by the presence of an elliptical discontinuity in an infinite isotropic homogeneous elastic solid is examined. The solutions are obtained for the special cases of the rigid immovable inclusion and the vacuous cavity inclusion, and numerical results are presented.

The solutions to the wave equations in elliptical coordinates are expressed in series of the elliptical geometry eigenfunctions. Application of the boundary conditions, vanishing displacements for the rigid immovable inclusion and vanishing stresses for the cavity inclusion, yields in each case two infinite sets of linear algebraic equations for the expansion coefficients of the series …

Oscillations In Pulse Frequency Modulated Control Systems, Warren Joseph Guy

Dissertations

This dissertation is concerned with oscillations and their stability which occur in a control system containing two nonlinearities, separated by linear elements. Specifically the nonlinearities are Integral Pulse Frequency Modulators and the linear elements are described by ordinary differential equations which are linear. The IPFM can be modelled by a quantizer with hysteresis and many other PFM laws are related to IPFM, thus the study applies to more than just IPFM alone.

Boundaries on the system parameters are identified within which free oscillation may be possible. These boundaries give sufficient conditions for stability and necessary conditions for instability. Also since …

The Oxidation Of Sulfur Dioxide In A Regenerative Reactor, Raymond Henry Edgecomb

Theses

A novel dual-unit sulfuric acid converter is depicted that performs in cyclic operation in unsteady state. A mathematical model and IBM 1130 Computer program were developed to show the temperature and conversion profiles in commercial-sized vanadium oxide catalyst beds. In the catalytic oxidation of sulfur dioxide conversions of 95-97% were attained without benefit of conventional heat exchangers. A single exchanger operating in conjunction with the dual-unit system might attain conversions as high as 99%.

Batch Heat Transfer To Suspensions In An Agitated Vessel, John Philip Horzepa

Theses

Batch heat transfer data was experimentally determined for two phase (solid?liquid) systems in a baffled agitated vessel. Three iron oxide and water and two kaolin and water suspensions were evaluated and were found to be pseudoplastic. A total of 231 heating and cooling data points were examined. Each suspension was evaluated using anchor, paddle, propeller and turbine impellers. Various sizes of the latter three impellers were used.

The experimental heat transfer results for suspensions were compared with the Hagedorn and Salamone correlation for pseudoplastic liquids. Only partial agreement with the more dilute suspensions was obtained. Overall, the data for suspensions …

Determination Of The Electronic State Of Aryl Nitrenes In An Intramolecular C-H Insertion Reaction, Ali Mohammad Khonsari

Theses

β,γ-Dideuteriopropylbenzene was obtained in 84% yield from deuteration of allylbenzene. Nitration of this compound resulted in o-nitro (β,γ-dideuteriopropyl)-benzene. Reduction of this compound gave o-(β,γ-aideuterio-propyl)aniline. o-(β,γ-Dideuteriopropyl)phenyl azide was prepared by dizotization of the aniline compound, followed by treatment with sodium azide.

Decomposition of the azide in isooctane solution by photolysis at room temperature gave no trace of deuterio-2-methylindoline (intramolecular insertion product).

Photolysis of the azide at the reflux temperature of the solvent (99?C) resulted in the formation of deuterated-2-methylindoline as the major product (40%) yield. The reaction is presumed to proceed through an aryl nitrene intermediate. Analysis of the nuclear magnetic …

A Comparative Analysis Of Multicomponent Distillation Minimum Reflux Methods, Joesph H. F. Loozen

Theses

One of the most important factors to know in the design of distillation columns is the minimum reflux ratio. Numerous procedures have been developed for the determination of the value of the minimum reflux ratio for multicomponent mixtures requiring various degrees of computational effort. Shortcut techniques are obviously advantageous with respect to computation time. After reviewing the available methods, those by Underwood, Colburn, Scheibel and Montross, Murdoch and Holland, and Shiras et al. were selected for further evaluation, mainly on the basis of practical potential.

Comparison of these procedures was accomplished by calculating the minimum reflux ratio for a large …

An Economic Evaluation Of A Pressure Sulfuric Acid Manufacturing Plant, Daniel A. Marlin

Theses

The production of Sulfuric Acid at elevated pressures is presented with the economics for operating at one, three, five, seven, nine and thirteen atmospheres. The conventional and pressure plants are compared operating on the same basis.

The basis for a pressure plant design is obtained from an I.B.M. 1130 computer program developed for One Thousand Net Tons per Day of Sulfuric Acid. Recognized operating conditions for a conventional acid plant are incorporated in the pressure plant design program.

Sulfuric Acid manufacture with operating pressures higher than atmospheric, but less than five atmospheres, results in maximum rate of return on investment …

A Computer Program For The Optimization Of Binary Distillation In A Dual-Column System, Richard Vincent O'Lenick

Theses

A computer program is presented for the optimization of a two-column distillation system involving a two-component mixture. The economic reflux ratios in each column are determined using the McCabe-Thiele Method. Activity coefficients are computed by either the Wilson equation, the Margules equation, or both. The program is general and may be used for any binary system where the assumption of constant molal overflow is valid.

Options in the program permit use of either column in separate calculation schemes.

While the optimization effort was prepared in general terms, the initial work was directed toward the acetone-water system. Full data for this …