Engineering Commons^™

Heat Transfer Coefficients Of Non-Newtonian Slurries In Laminar Flow, Robert Frederick Roth, David B. Swanson

Theses

A total of 51 heat transfer runs were made in the first 25 runs, slurries of half micron and finer kaolin at 3.0, 5.6, 9.6 and 12.9% solids were used. Slurries of two microns and finer kaolin at 10.1, 13.7, 20.4 and 23.1% solids were used in the remaining 26 runs.

The Reynolds Numbers ranged from 0.9 to 2,020 for the 51 runs.

The data was correlated by the following equation:

H_f/C_bV_bP_b C_bR_b/K_b ^2/3 = 0.70 DV_bP_b/R_b ^-2/3

for an L/D ratio of …

Heat And Momentum Transfer Within The Thermal Entrance Region For Non-Newtonian Fluids In Laminar Flow, George Marshall Drake Jr.

Doctoral Dissertations

It was felt that a technique of experimentally evaluating thermal conductivities of liquids from a dynamic flow system was necessary for the analysis of functional relationships between thermal conductivity and shear stress for non-Newtonian fluids, and the present work was undertaken in an attempt to develop such a technique. Specifically, the objectives were: (a) to develop an experimental and mathematical method to evaluate point values of thermal conductivity as a function of temperature and shear stress, and (b) to evaluate the effect of liquid thermal conductivity variation on temperature profiles observed in laminar non-isothermal flow.

To achieve these objectives, a …

Evaluation Of The Thermal Properties Of Plastic Laminates, Luciano Sedillo

Chemical and Biological Engineering ETDs

To insure the proper application of newly developed materials, it is necessary to evaluate their physical and chemical properties. In the case of plastic laminates for use as heat barrier material, thermal diffusivity is an important property. Thermal diffusivity is the parameter which governs the rate of temperature change through a material. Its value depends upon the chemical composition and the physical structure of the material and its temperature.

Liquid Thermal Diffusion: The Prediction Of Separations; Experimental Data For Cuso4-Coso4-H2O Using A Soret Cell Of New Design, Daniel Hershey

Doctoral Dissertations

Investigation of the thermal diffusion phenomenon has transcended the merely academic phase. It is recognized that in some cases thermal diffusion can represent an effective means of separating components, such as isotopes in gases, close boiling components and isotopes in the liquid phase, and electrolytes in aqueous solution. If the separation in a thermal diffusion column could be predicted, it would be possible to scale up, make economic feasibility studies and other pertinent calculations. Thus thermal diffusion would join the mass transfer operations such as distillation, extraction, and the relatively new ion exchange.

Thermal diffusion in gases has been adequately …

An Experimental Study Of The Production Of Metallic Impregnations And Coatings -- A Vacuum Process, Engle D. Southard

Chemical and Biological Engineering ETDs

The purpose of this study undertaken was threefold, (1) to design and construct an experimental vacuum apparatus to produce a metal impregnated or coated material; (2) to study some of the variables which affect the process; then (3) to examine the physical characteristics of the resultant materials. Described herein is the development and operation of a vacuum system capable of producing conditions to permit the evaporation of metals to impregnate and coat various materials. The fundamental principle involved in this process is that a rarified atmosphere reduces the temperature required for metal evaporation and protects the metal vapor from reacting …

The Effects Of Operating Variables On The Adsorption Of Water From Iso-Propyl Alcohol Using Molecular Sieves, Warren P. Johnson

Chemical and Biological Engineering ETDs

The purpose of this paper is to present a study made on the effects of (1) feed concentration, (2) liquid flow rate, (3) column dimensions and (4) absorbent particle size on the selective absorption of water from iso-propyl alcohol with molecular sieves in a semi-continuous or fixed-bed operation.

Effect Of Cleaning Methods Upon Electrochemical Behavior Of High-Carbon Steel Cathodes In A Chromic Acid Electrolyte, George Chaplenko

Theses

The quality of electrodeposited coatings is to a great ex- tent determined by cleaning or surface-conditioning methods employed in preparing the basis metal for plating. Cleaning pro- cedures are usually established empirically, by trial and error. Little or no experimental work was devoted to a quantitative stu- dy of measurable parameters that are influenced by the relative effectiveness of individual cleaning processes. The present ex- periment was designed in an attempt to establish a correlation between one such parameter (namely, the single-electrode poten- tial of polarized cathode) and the quality of subsequent plating.

High-carbon steel cathodes, -a material that is …

Thermodynamic Properties Of Formaldehyde, Raymond H. Koo

Theses

The thermodynamic properties of saturated and superheated formaldehyde were evaluated at ten degree temperature intervals from -19°C. to 400°C. and at various pressures up to 150 atmospheres.

Lydersen's correlations were used to estimate the critical constants.

Vapor pressure data were calculated using Riedel's method.

The generalized thermodynamic correlations of Hougen, Lydersen,'and Greenkorn were employed to obtain values of the thermodynamic properties in the saturated and superheated regions.

The values for temperature, pressure, specific volume, enthalpy, and entropy for saturated and super-heated formaldehyde are presented in the form of tables and graphs.

A Flotation Process For The Concentration Of New Mexico Oolitic Iron Oxide Ores., William C. Rahmig

Chemical and Biological Engineering ETDs

The vast expansion in the production of steel in the twentieth century has turned the eyes of the steel industry toward sources of low grade iron ore. Evidence of this is dramatically presented in a recent issue of Steel Facts. Fifty two percent of the iron ore mined in the United States was concentrated before shipment to the consumers. This is an increase of 25 percent over the amount concentrated a decade ago. The marked increase will continue as technological advances light the way for economical are treatment.

The Dynamics Of A Packed Gas Absorber By Frequency Response Analysis, Robert I. Gray

Doctoral Dissertations

Summary

The unsteady state behavior of physical gas absorption in a packed bed was studied by comparing the results of experimental frequency response tests of such a system with theoretical frequency responses determined for several postulated flow models.

Rapidly expanding automatic process control technology has resulted in a great increase in the number of experimental and theoretical studies of process dynamics in the last five years. Countercurrent, diffusional operations in distributed systems, however, have received little attention. Therefore, this study was undertaken to provide a more thorough understanding of the dynamic behavior of such an interphase mass transfer process and …

A Heterocyclic Alkyd Resin, Bhailalbhai M. Patel

Masters Theses

" 'Alkyd’ is a word coined by Kienle in 1927 to designate a class of synthetic resins which include the complexes resulting from the reaction of polyhydric alcohols and resinifying carboxylic organic aromatic acids or their anhydrides. The word in a broad sense is generally considered to apply to many modifications of these resins - drying, semi-drying and non-drying oil-modified alkyds. It was derived from the words alcohol and acid by combining “al” and “cid” and for euphony changing the ”cid” to “kyd” – al(cid)kyd.

Compounds having rings composed solely of carbon atoms are called homocyclic compounds or carbocyclic compounds. …

A Study Of Invert Emulsion Drilling Fluids, Edward R. Tegland

Masters Theses

"Since invert emulsions are being applied as drilling fluids to cope with special drilling and completion problems, evaluations of existing and new types of emulsions are needed. Three types of emulsions are evaluated in this study: (1) type A emulsions prepared with a commercial emulsifier, (2) type B emulsions prepared by adding clay to the external phase, and (3) type C emulsions containing no externally added emulsifier.

Standard testing procedures were used to measure the viscosity and filtration properties of the emulsions studied. Interfacial tension measurements were made using a technique described in the literature. The degree of stability for …

A Study Of The Dissolution Of Hafnium In Hydrofluoric Acid, James W. Johnson

Doctoral Dissertations

"The purpose of this investigation was to obtain kinetic and electrochemical information concerning the reaction of hafnium with hydrofluoric acid in order to establish the mechanism of dissolution. This included the determination of dissolution rates, the difference effect, and dissolution potentials of hafnium in hydrofluoric acid"--Abstract, page 1.

Evaluation Of Protective Paint Films On Steel By X-Ray Diffraction Techniques, Donald Charles Knobeloch

Masters Theses

"Paints and related organic materials provide the most widely used means of protecting metals against corrosion. While corrosion measurements are based on a full range of quantitative methods in physical and analytical chemistry, the basic problem of evaluation work in the field of paint chemistry has been characterized by empirical testing procedures. Field tests are still of major importance and secondly, the relative value of paints may be predicted through exacting laboratory tests. However, the results of accelerated exposure tests have never successfully been correlated with service experience despite the efforts of many laboratories over a period of 35 years …

Design, Construction And Operation Of Equipment For The Study Of Evaporation Of Aqueous Solutions Using A Simplified Reactor Design Approach, Virendra Kumar Mathur

Masters Theses

"The study of simultaneous heat and mass transfer in flow reactors has attracted the attention of many workers for a long time due to its wide application in the industrial field. These heat and mass transfer studies play an important role in determining the rate equations and in turn the size of the reactor itself. A large number of chemical reactions have been studied by various workers….

The purpose of this work comprised only the initial or exploratory phase of this overall project, and deals with the design, construction and assembling of the equipment necessary to carry out the vaporization …