Engineering Commons^™

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 …

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 …

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 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.