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 89 for “"surface wettability"”.
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Influence of Surface Wettability on Drop Dynamics and Condensation
… by the chemistry and physical texturing of the surface. At the two theoretical extremes, a liquid drop on a surface can completely spread to a film or bead to a perfect sphere. In practice, some form of intermediate or partial wetting is obtained with the liquid adopting a spherical cap shape. …
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Surface wettability studies of PDMS using flame plasma treatment
… studied in this thesis was able to oxidize the surface of Polydimethylsiloxane (PDMS) in a fraction of a second. It was found to be a much faster way to modify PDMS surface wettability than the current technologies. The surface wettability of Polydimethylsiloxane (PDMS) treated with flame plasma …
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Nanostructured multifunctional materials for control of light transport and surface wettability
Biological surfaces have evolved to optimize their structures and physical and chemical properties at the micro/nanoscale for adaptation to different environments, exhibiting a wide variety of beneficial functions, ranging from optical properties to wettability, such as anti-reflection coatings in …
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The effect of surface wettability on frost growth and densification on flat plates
… surrounding air temperature and humidity, and surface temperature, frost growth and densification rates on cold, flat surfaces subject to forced convective heat and mass transfer depend on surface wettability and cooling rate during the condensation phase. If the cooling rate is high during the …
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Effects of air-side surface wettability on the performance of dehumidifying heat exchangers
Wettability manipulation is investigated as a method to enhance condensate drainage from the air-side surface of dehumidifying heat exchangers. The attendant impact on the thermal-hydraulic performance of a heat exchanger is also explored, with the goal of improving energy efficiency of heat …
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Impact of heat exchanger surface wettability on condensation, frosting, and defrosting performance under practical testing conditions
… strategy to address these challenges is through surface engineering, where coatings and treatments are designed to alter wettability and control droplet dynamics, frost nucleation, and ice adhesion. Prior studies have mainly concentrated on hydrophobic and hydrophilic coatings applied to flat …
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Molecular Dynamics Studies of Thin-Film Evaporation: The Effect of Graphene-Coated Silicon on Water Evaporation Behavior
… between interfacial thermal resistance, surface wettability, and thin-film evaporation behavior. In this study, non-equilibrium molecular dynamics simulations are used to study mass and heat transfer in thin-film evaporation of water on a silicon substrate, and equilibrium molecular …
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Droplet manipulation on structured shape memory polymer surface
While methods for dynamic tuning of surface wettability to manipulate water droplets have been widely explored for many applications including digital microfluidics, those based on dynamically changeable surface morphology have remained challenging to achieve. In this work, we present a structured …
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Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling
… in commercial nuclear reactors may affect the surface wettability of fuel rods through the Radiation Induced Surface Activation (RISA) effect, and present power limits on nuclear reactors may be underestimated. Recent studies have focused on the influence of surface wettability on the departure …
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Wettability of candidate Accident Tolerant Fuel (ATF) cladding materials in LWR conditions
… water reactor (LWR) operating conditions. The surface wettability is particularly important, as it affects the dynamics of the boiling heat transfer process, and consequently, the critical heat flux (CHF) and rewetting temperatures, which are important thermal limits for LWRs. Surface …
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Development of a novel chip-based platform for long-term neuronal culture, stimulation, and imaging
… studied in this thesis was able to oxidize the surface of Polydimethylsiloxane (PDMS) in a fraction of a second. It was found to be a much faster way to modify PDMS surface wettability than the current technologies. The surface wettability of Polydimethylsiloxane (PDMS) treated with flame plasma …
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Pool boiling heat transfer characteristics of nanofluids
… point, viscosity, thermal conductivity, and surface tension) were measured and, consistently with other nanofluid studies, were found to be similar to those of pure water. However, pool boiling experiments showed significant enhancements of CHF in the nanofluids. Scanning Electron Microscope …
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3D cyclic olefin copolymer (COC) microfluidic chip fabrication using hot embossing method for cell culture platform
… hot embossing technique, and amenability to surface treatments. Here the fabrication process is described and the new systems are characterized. Surface wettability, bond strength between the system body and a covering plastic film, and cell viability data are presented and compared to …
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Wettability on nanoparticle modified surface: for thermal engineering
… strategy. Hydrophilicity, implying better wettability of liquid on solid surface, is preferred in some processes of air-conditioning and power-generation systems, such as dehumidification, evaporative cooled condensers, and pool boiling at high heat flux. Recent research in nanofluid …
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Novel hydrogel copolymers and semi-interpenetraing polymer networks
… glass transition temperatures, mechanical, surface, water binding and oxygen permeability properties samples were assessed for their suitability for use as biomaterials. In addition copolymers containing tris-(trimethylsiloxy)-y-methacryloxypropyl silane, commonly abbreviated to 'TRlS', have …
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Growth and characterisation of multifunctional nanocomposite coatings
… electron microscopy, X-ray diffraction, surface wettability, nanoindentation and nanowear testing, have been utilised effectively to study the coating structure and evaluate their performance. The origin of such a unique microstructure is attributed to the thermodynamic immiscibility of …
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Phase-field modeling of liquids splitting between separating surfaces and its application to high-resolution roll-based printing technologies
… release of liquid ink to the substrate surface is achieved through the transport of the liquid ink through a series of ink transfer rollers in the form of splitting liquid bridges. An in-depth understanding of the liquid transport process through the ink transfer rollers is essential for …
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Shedding of Multiple Sessile Droplets
A droplet which is placed on a surface and is exposed to an airflow, can be shed, if the drag force overcomes the droplets adhesion force. Presence of other sessile droplets, in proximity, changes the drag force, so the minimum airflow velocity required to shed the droplets (Ucr) can vary. In this …
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INVESTIGATION OF CARBON DOTS BEHAVIOR: DIFFUSIOPHORESIS AND INFLUENCE ON THE OIL-WATER INTERFACES
… and their influence on interfacial tension and surface wettability.In this study, stable carbon dots (CDs), 4-10 nm in size with -7 mV zeta potential, have been synthesized through pyrolysis of citric acid and ethanolamine. The diffusiophoretic behavior of CDs was observed in both deionized …
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Design & Fabrication of Super-Hydrophobic Surfaces by Laser Micro/Nanoprocessing
Super-hydrophobic surfaces exhibit the property of high water repellence. In nature, lotus leaf and other plants have super-hydrophobic surfaces with self-cleaning effect. Taking inspiration from the surface properties of the lotus leaves, the ways to design and fabricate artificial …
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