Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"film rupture"”.
-
Surface Analysis Applied to Thin Films of Molecular Solids
Finally, some preliminary results with polymer film assemblies were presented. Although the major problems of charging and film rupture were avoided, the research was handicapped by a loss of the components of interest, which were low concentration of organic compounds dispersed in the polymer …
-
Hydrodynamic studies and mathematical modeling of fine coal flotation
… column diameter, air flow rate and critical film rupture thickness. The last parameter is a measure of the hydrophobicity of the particles to be floated. Using the theoretically determined rate constant, a population balance model has been developed for the flotation of fine coal in a column. …
-
The influence of vapor pressure on droplet contact dynamics on smooth surfaces.
… to gain insight into the mechanism for the air film failure of volatile liquids. Several parameters were varied including the impact velocity and droplet volatilities to understand the relationship between the fluid properties and the air film rupture. It was observed that while increasing the …
-
Viscous fluid sheets
… terms of a coordinate system that moves with the film. Special attention is given to incorporating inertia and the curvature forces that arise from the thickness variations along the film. Exploiting the slenderness of the film, we assume that the transverse fluid velocity is small compared to the …
-
Integrated environmental degradation model for Fe-Ni-Cr alloys in irradiated aqueous solutions
… rate at the crack tip following passive film rupture. The results of each of these models are combined to determine the crack advance rate for the given conditions. Environmentally assisted cracking (EAC) is a phenomenon where a combination of aggressive environment, susceptible material, …
-
Studies on the stability of thin films in bubble-particle adhesion
The critical rupture thicknesses (H<sub>C</sub>) of thin liquid films between air bubbles and solid surfaces have been measured using an optical interferometry technique. The results of the measurements show that H<sub>C</sub> increases with the increasing hydrophobicity of a solid and varies …
-
Effect of aqueous environments on the fatigue behavior of 90-10 copper nickel
… nickel increased due to the retardation of film formation and repassivation. These studies showed that three different mechanisms of corrosion fatigue were likely: localized anodic dissolution, surface film rupture and hydrogen embrittlement. The dominance of one mechanism over the other two …
-
Linear and nonlinear vibrational characteristics of oil lubricated journal bearings
… different cavitation boundary conditions at film rupture and the effect of oil film behaviour during journal vibration. An analysis of the single axial groove journal bearing is presented and the effects of groove location and oil supply pressure on the vibrational characteristics of the …
-
Applications of CO2 in CO2-responsive foams and pyrochlore froth flotation
… the close packing of the surfactant which led to film rupture. The second project compares the effect of CO2 used as an acid instead of HCl or oxalic acid in pyrochlore mineral flotation. In micro-flotation testing it was found that at a pH of 4, the use of CO2 led to recoveries of pyrochlore and …
-
Stress corrosion cracking of austenitic stainless steels
… but in zone 1 the behavior was not clearly HE. Film rupture and active path corrosion were found to proceed in zone 3. In zone 2, SCC seemed to proceed by a mixture of models. The HE characteristics in 301 alloy was believed to be related to the rate of accumulation of hydrogen at the crack tip. …
-
Surface structure enhanced microchannel flow boiling of low surface tension fluids
… correlated with the capillary-limited thin-film dryout heat flux. The same semi-analytical model suggested that thin-film dryout would occur at approximately one and two orders of magnitude smaller heat fluxes when switching from water to methanol and HFE 7000, respectively. In this thesis, …
-
Influence of side walls and undulated topography on viscous gravity-driven film flow
While a gravity-driven viscous film flow down an inclined flat plane of infinite extent can be described by an easy analytical solution, flow problems in nature, like glacier movements or the liquid film on the human eye are much more complex. Also to optimize a large number of technical …
-
Development of a turbulent flotation model from first principles
… and the disjoining pressures in the thin aqueous films between air bubbles and particles. In the present work, a mathematical model for the flotation process has been developed by considering both the hydrodynamic and surface chemical parameters. The model can describe the events occurring in both …