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 120 for “"superhydrophobic"”.
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Condensation on superhydrophobic copper oxide nanostructures
… generation and water desalination technologies. Superhydrophobic nanostructured surfaces have unique condensation properties that may enhance heat transfer through a mechanism driven by surface tension. The increased droplet removal rate and reduced size of departing droplets facilitates …
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ADDITIVE MANUFACTURING OF SUPERHYDROPHOBIC STAINLESS STEEL COMPOSITES
… that achieve these goals by demonstrating superhydrophobic surface behaviors. Composite materials made up of 316L stainless steel powders and various concentrations of boron nitride nanotubes (BNNT) were mixed and printed via laser powder directed energy deposition (LP-DED). The additively …
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Superhydrophobic membranes for membrane distillation and crystallization
… form of low permeate flux and membrane wetting. Superhydrophobic modifications to the membrane surface could potentially overcome this issue. While superhydrophobic surfaces have been known to display anti-fouling properties, how this affects membrane distillation performance is still not well …
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Hierarchical superhydrophobic aluminum surfaces for condensation applications
… dropwise condensation is the implementation of superhydrophobic structures and chemistries on condensing surfaces. Aluminum, being a heavily utilized material in many condensing systems and other industrial applications, is the subject of the present study. This thesis presents methods for …
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Experimental studies of liquid marbles and superhydrophobic surfaces
… of water droplets with hydrophobic or rough, superhydrophobic solid surfaces has been studied. Such surfaces may be found in the natural world and their potential applications range from waterproof and self-cleaning surfaces to droplet microfluidics. A measure of hydrophobicity is obtained …
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Specialized Inter-Particle Interaction Lbm For Patterned Superhydrophobic Surfaces
… INTER-PARTICLE INTERACTION LBM FOR PATTERNED SUPERHYDROPHOBIC SURFACES</p> <p>by</p> <p>AMAL S. YAGUB</p> <p>ABSTRACT:</p> <p> Superhydrophobic surface characteristics are important in many industrial applications, ranging from the textile to the military. It was observed that surfaces …
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Enhanced Laminar Convective Heat Transfer using Microstructured Superhydrophobic Surfaces
… One such example is a micropatterned, superhydrophobic surface, which has been shown to enable slip resulting in a decrease in drag and pressure loss for both laminar and turbulent flow. The hydrodynamic effects of these surfaces have been studied in depth, but the effects on heat …
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Droplet behavior on superhydrophobic surfaces: Interfaces, interactions, and transport
… dynamics on smooth hydrophobic and textured superhydrophobic surfaces, and to understand the dependence of interfacial interaction mechanisms on surface morphology. ^ A detailed understanding of the dynamics of droplet response to an applied electric field is essential for implementation of …
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The influence of superhydrophobic surfaces on near-wall turbulence
Superhydrophobic surfaces are able to entrap gas pockets in-between surface roughness elements when submerged in water. These entrapped gas pockets give these surfaces the potential to reduce drag due to the overlying flow being able to locally slip over the gas pockets, resulting in a mean slip at …
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Characterization of the robustness of superhydrophobic surfaces during condensation
… power plants in their power generation cycles. Superhydrophobic surfaces can potentially improve the heat transfer due to condensation when compared to the untreated surfaces typically used in condensers. This can improve the efficiency of power plants by up to 3%. These surfaces are made by …
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Skin friction drag reduction in turbulent flows using superhydrophobic surfaces
The use of randomly textured superhydrophobic surfaces have recently gained interest as a potential approach for the passive reduction of skinfriction on the hull of ships, submarines and underwater projectiles. When submerged in water, these surfaces trap a layer of air (or 'plastron') within …
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Investigations on Multiscale Fractal-textured Superhydrophobic and Solar Selective Coatings
… is presented on various hydrophobic and superhydrophobic surfaces generated on several materials under different processing conditions. Superhydrophobic surfaces have myriad industrial applications, yet their practical utilization has been severely limited by their poor mechanical …
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Numerical Prediction of Drag Reduction and Interfacial Shapes Over Superhydrophobic Surfaces
… developed to study the drag-reducing effects of superhydrophobicity for realistic surfaces. A multiphase Navier--Stokes volume-of-fluid based approach is developed to investigate the effect of interface curvature, and turbulence on drag reduction in the presence of realistic roughness. A Gibbs …
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Condensation heat flux measurements in ambient conditions on superhydrophobic nanostructured surfaces
… anti-icing and self-cleaning. Recently, superhydrophobic coatings have gathered attention with jumping droplets with the potential for self-cleaning applications and spot cooling on high powered applications. With new coatings being used on different materials, a need has developed for …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… consisting of hydrophobic and nanostructured superhydrophobic regions, showing excellent agreement with the simulations for both constant base area and constant contact angle growth regimes. Our results demonstrate the importance of resolving local heat transfer effects for the fundamental …
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Fabrication and robustness testing of superhydrophobic nanostructured surfaces for enhanced jumping condensation
… will require advanced heat transfer materials. Superhydrophobic micro- and nano-structured surfaces which promote a jumping droplet mode of condensation have been shown to enhance heat transfer over conventional film wise condensation surfaces, but limited robustness testing has been reported …
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Heat transfer rates for filmwise, dropwise, and superhydrophobic condensation on silicon substrates
… (DWC) occurs, and even further optimized using superhydrophobic surfaces. For superhydrophobic condensation, a structured silicon surface with pillars 2.1 p.m tall, 200 nm in diameter, and a 400 nm pitch was tested. By removing noncondensable gases (NCG) from the system by means of a steam trap, …
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Investigation of the Effect of Superhydrophobic Coatings on the Performance of Heat Exchangers
… of this project was to investigate the effect of superhydrophobic coatings on the performance of aluminium louvered fin heat exchangers. A method was developed to prepare superhydrophobic coatings on the exchangers by applying layer of metallic zinc and then reacting the zinc-coated exchanger with …
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