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 23 for “"Surface texturing"”.
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Micro Surface Texturing for Friction Control
Recently, surface texturing has gained momentum as a way to control the friction which is involved in various applications and systems, such as components of internal combustion engines, dies and punches of the metal forming processes and Micro-electrical-mechanical Systems (MEMS). This …
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Laser Surface Texturing To Create Biomimetic Surface Topographies For Marine Antifouling Efficacy Testing
… of organisms on a living or artificial surface. Convergent evolution has led to the development of antifouling textures on many marine species. This thesis provides novel investigation into creating biomimetic antifouling surface directly onto marine grade stainless steel using laser …
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Laser Surface Texturing, Crystallization and Scribing of Thin Films in Solar Cell Applications
… conical and pillar-shaped spikes formed on the surface of a-Si:H films by irradiation of both femtosecond (fs) infrared and nanosecond (ns) excimer lasers enhanced light absorption, while the formation of a mixture of hydrogenated nanocrystalline silicon (nc-Si:H) and a-Si:H after …
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Tribological studies of surface texturing for application in air-conditioning and refrigeration compressors
… efficiency. Also, protection from beneficial surface layers, such as ferrous chlorides, on the critical interfaces is compromised as the refrigerants industry is moving from traditional (CFC/HFC) to environmentally friendly refrigerants. Thus, there is a need to have a closer look at the …
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Effects of lubricant viscosity and surface texturing on ring-pack performance in internal combustion engines
… combustion engine. Both lubricant viscosity and surface texturing were investigated in an effort to reduce this ring-pack friction and increase engine efficiency. While both optimizing viscosity and surface texturing are predicted to cause a reduction in ring/liner friction individually, a …
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Design of Surface Texture for the Enhancement of Tribological Performance
Surface texturing is a method of surface modification that fabricates micro patterns on the contacting surfaces to improve the tribological performance in sliding, lubricated system. It is found that the geometric design of textures has a significant influence on the performance of textured …
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A tribological study of the interaction between surface micro texturing and viscoelastic lubricants
… study is performed on micro textured surfaces using both elastic and Newtonian fluids in order to understand the effect of surface texturing and fluid rheology on sliding friction under lubricated conditions. Nickel micro textured surfaces containing 50 to 125 micron diameter pores and …
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Femtosecond-laser irradiation as a platform for tailoring the optoelectronic properties of silicon
… and p-type doping, has a naturally passivating surface oxide, and long minority carrier lifetimes. The major drawback of silicon is that it has an indirect band gap at 1.1 eV. It is therefore a poor light absorber and is naturally transparent to light in the infrared. Femtosecond (fs) laser …
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Innovative Heat Transfer Augmentation Techniques in Mechanical Face Seal
… heat transfer augmentation techniques - surface texturing and built-in phase change device - have been developed in our laboratory to effectively enhance the heat transfer in mechanical face seal. Surface texturing can increase the surface area, change the near boundary flow structure and …
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Investigation of Light Induced Degradation in Promising Photovoltaic Grade Si and Development of Porous Silicon Anti-Reflection Coatings for Silicon Solar Cells
… wafers inhibit the formation of an effective surface texturing using conventional techniques. The other main substrate used is single crystalline Czochralski wafers (~30% of the market share). Czochralski silicon material is known to suffer from the formation of a metastable defect under …
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Synthesis and Characterization of Titanium Zirconium Based Alloys for Capacitor Use
… creep of Ti25Zr38Be37 metallic glass for surface enhancement. A variety of mechanical and electrical properties were measured. Leakage current through the anodic dielectric was found to decrease with increasing zirconium content. Alloy treatments which produce concentration gradients (a, …
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Friction characteristics of microtextured surfaces under hydrodynamic lubrication
Surface microtexturing has shown significant promise over the past decade as one of the surface engineering methods to modify friction performance. We tackle two important problems associated with surface texturing – developing low cost scalable manufacturing technique and engineering design rules …
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Experimental Investigations on Non-Wetting Surfaces
Superhydrophobic (SHS) and lubricant-infused 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 …
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Optical properties of black silicon - an analysis
… is based on a quarter-wavelength coating. Surface texturing is a technique, by which the reflectivity is reduced. Black Silicon is a material with surface roughness in the micron scale. Black Silicon, when used instead of Crystalline Silicon, offers the possibility to increase the …
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Defining the role of elastic lubricants and micro textured surfaces in lubricated, sliding friction
… and adding a micro-scale texture to the sliding surfaces, but the mechanism of how lubrication properties and surface texturing interact is poorly understood. This thesis presents a study of lubricant elasticity and surface micro texturing and explains the mechanisms for the resulting altered …
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Structural Functional Surface Design and Manufacture
… the potential benefits of structural functional surfaces using facilities available within the University. The potential benefits were demonstrated by applying functional surfaces to a set of particular engineering applications. The thesis mainly concentrated on improving the frictional …
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Cupisnique, Tembladera, Chongoyape, Chavín? A Typology of Ceramic Styles from Formative Period Northern Peru, 1800-200 BC
… of different kinds of paint, and the use of surface-texturing techniques, amongst others. The recurring of specific and mutually exclusive combinations of traits strongly indicates distinct manufacturing processes (chaînes opératoires) that in turn point to separate cultural traditions of …
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Laser micro-processing of silicon using nanosecond pulse shaped fibre laser at 1 μm wavelength
… high quality, high efficiency micro drilling and surface texturing applications. A secondary aim is to develop a greater understanding of the laser material interactions and material removal mechanism when using fast rise-time nanosecond laser pulse envelopes. The IR fibre laser was able to …
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Surface textures and non-Newtonian fluids for decreased friction in full film lubrication
Surface texturing has been studied extensively to decrease friction in lubricated sliding contact. The majority of the previous experimental work has focused on symmetric-depth-surface textures. This work examines both symmetric and asymmetric surface textures in order to determine the effects of …
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The effect of texture granularity on turbulence
We study the effect of surface texture on an overlying turbulent flow for the case of textures made of an alternating slip/no-slip pattern, a common model for super- hydrophobic surfaces. For texture sizes L⁺ ≤ 20, it has been previously discussed that turbulence remains smooth-wall-like, other …
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