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.
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Showing 1 to 20 of 49 for “"non-wetting"”.
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Experimental Investigations on Non-Wetting Surfaces
… surfaces (LIS) exhibit exceptional non-wetting characteristics that make them attractive for energy production applications including steam condensation and fouling mitigation. The dissertation work focuses on application of non-wetting surfaces to energy production using a …
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Evaporation-induced non-wetting droplets on superhydrophilic surfaces
… in spontaneous spreading and hence complete wetting. However, in this thesis, we demonstrate that this wetting behavior can be altered by superheating the substrate such that droplets can reside in a non-wetting state due to evaporation. Photolithography and deep reactive ion etching were …
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Analysis of Interfacial Processes on Non-Wetting Surfaces
Non-wetting surfaces mainly categorized into superhydrophobic (SHS), lubricant-infused (LIS) and solid-infused surfaces (SIS), by virtue of their superior water repellant properties have wide applications in several energy and environmental systems. In this dissertation, the role of non-wetting …
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Tailoring hydrodynamics of non-wetting droplets with nano-engineered surfaces
… to achieve better efficiency. Firstly, the wetting transition on textured super-hydrophobic surfaces is explored. The careful investigation of Cassie-Baxter to Wenzel transition of a pendant drop during the deposition explains that the rapid deceleration-induced water hammer pressure causes …
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A Study of Dew Harvesting and Freezing Performance of Non-Wetting Surfaces
Non-wetting surfaces offer enhanced capabilities over bare metal substrates for condensation with or without phase change. This trait can be utilized to broaden strategies in combating water scarcity in water stressed areas. Slippery lubricant infused surfaces have the ability to shed water …
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The use of silicone resins as non-wetting files on heating surfaces
The effect of a single spray coating of 60.9% D.C. 801 silicone resin, with a 0.3% cobalt on the dry resin basis, on (1) the initial overall heat transfer coefficient, (2) the overall heat transfer coefficient under accelerated scale forming conditions, and (3) the corrosion resistance of 1.5” o.d. …
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Exploring plastron stability and fluid friction reduction on robust micro-textured non-wetting surfaces
Non-wetting surfaces are characterized by the presence of stable pockets of vapor trapped within the asperities of the surface morphology. The utility of these surfaces in reducing skin friction in viscous laminar and turbulent flows is experimentally and theoretically investigated and is the main …
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Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media
… if this discontinuity is a physical phenomenon that truly occurs or a mathematical anomaly that does not manifest physically at porous interfaces through which a non-wetting phase flows. The study uses mathematical models and experiments applied to water transport in the gas diffusion layer …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… mechanisms governing vapor condensation on non-wetting surfaces is crucial to a wide range of energy and water applications. In this thesis, we reconcile classical droplet growth modeling barriers by utilizing two-dimensional axisymmetric numerical simulations to study individual droplet …
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Dropwise condensation on hydrophilic surfaces
… has shown dropwise condensation heat transfer on non-wetting surfaces to be an order of magnitude higher than filmwise condensation heat transfer on wetting substrates. However, the necessity for non-wetting to achieve dropwise condensation is unclear. Here we report stable dropwise condensation …
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Mechanistic study of menisci motion within homogeneously and heterogeneously wet porous media
… is to model the detailed configuration of wetting and non-wetting phases within homogeneously and heterogeneously wet porous media. We use a dense random pack of equal spheres as a model porous medium. The geometry of the sphere pack is complex but it is known. In homogeneously wet porous …
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Dewetting and Stress Evolution in Thin Films During Ion Irradiation
This project studies the morphology evolution of non-wetting metal films on a substrate during ion irradiation. It reveals that the mobility of the solid atoms is significantly improved during irradiation and the non-wetting films can dewet as if they are melted. The ion induced dewetting process …
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Positive pressure drop-on-demand printhead for Three-Dimensional Printing
In drop-on-demand printing, wetting out of the binder fluid onto the orifice face typically has been prevented by some combination of the following: coatings on the orifice face, high surface energy fluids, and negative pressure. This non-wetting approach is not practical for low surface energy …
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Lattice-Boltzmann modeling of multiphase flow through rough heterogeneously wet fractures
… input parameters. The relationships of different wetting/non-wetting patterns and surface roughness, with interfacial areas, capillary pressure, and residual fluid saturation were quantified. It has been shown that there is an effective heterogeneous feature size related to the fracture dimensions …
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Studies on Corrosion, Fouling and Durability of Advanced Functional Nonwetting Surfaces
… porous surfaces are two classes of non-wetting surfaces that are inspired by the adaptation of natural surfaces such as lotus leaves, pond skater legs, butterfly wings, and Nepenthes pitcher plant. This dissertation focuses on fabrication and in depth study of bioinspired functional …
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Droplet repellency of microfabricated surfaces in saturated environments
… Micro scale pillar surfaces maintain the non-wetting Cassie-Baxter regime for drops of water over a range of saturation temperatures while micro scale waffles transition into a partially wetted state under the same conditions. Micro scale mushroom and waffle surfaces are able to maintain …
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Coalescence Behaviour of Liquid Drops at Solid Surfaces
… coalescence, and characterisation of 'wetting' or 'non-wetting' behaviour in liquid-vapour-solid systems by contact angles are summarised. Contact angle measurements have been extended to liquid-liquid- solid systems. Five organic liquids and water were investigated using both high and …
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Wetting of non rigid surfaces
In the world of anti-wetting surfaces, many superhydrophobic substrates comprise rigid structures on rigid substrates. The development of a thin flexible substrate would allow new avenues to be explored to fully take advantage of the non-wetting properties of superhydrophobicity. This thesis …
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