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 63 for “"capillary forces"”.
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Capillary forces and wetting dynamics by diffuse-interface modeling
… can drastically change the flow behavior due to capillary bridging between the particles. The study of these three-phase systems is especially relevant to the petroleum industry, where gas hydrates forming large clusters in subsea pipelines during crude oil transportation is a major concern. The …
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The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples
… the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples …
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Templated self-assembly of sub-10 nm quantum dots
… quantum dots self-assemble primarily through the capillary forces created by the dewetting of the template. We demonstrate this technique at sub-10nm length scales by spin-coating a solution of organically-capped CdZnS semiconducting quantum dots onto nanopatterned grating structures on silicon …
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Microstructure-induced capillary force effects on penetration and release in hydroxyapatite bone scaffolds
… upon implantation via micropore-induced capillary forces. The localization and entrapment of cells within the micropores forms a reservoir of cells that not only can begin the process of bone formation but can also signal other cells to further enhance the regeneration process. I also …
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Multiphase flow in porous media: the impact of capillarity and wettability from field-scale to pore-scale
… of fluid-fluid interfaces, which are subject to capillary forces. Multiphase flow in porous media is important in many natural and industrial processes, including geologic carbon dioxide (CO₂) sequestration, enhanced oil recovery, and water infiltration into soil. Despite its importance, much of …
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ENVIRONMENTALLY FRIENDLY TECHNOLOGY: THE BEHAVIOUR OF NATURAL AND SYNTHETIC BINDER SYSTEMS WITHIN PAPER COATINGS
… porosity to account for the water present The capillary forces acting on the surface of the simulated coating were calculated, and found to be several orders of magnitude larger than the measured shrinkage forces. The shrinkage process was thus described as resulting from the effect of …
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Interfacial Fluid Dynamics in Porous Media
… (wettability) and the balance of viscous and capillary forces. Examining this rich system at microscopic and macroscopic scales is at the center of this dissertation. In Part I, we build computational models to capture macroscopic fluid-fluid displacement patterns in disordered porous media, …
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Capillary densification and adhesion tuning of aligned carbon nanotube arrays for shape-engineerable architectures
… and their ability to be self-assembled by capillary forces motivates their use as shape-engineerable materials. In order to achieve facile and accurate patterning and densification of NFs into new architectures, a mechanistic understanding of the parameters governing NF synthesis, …
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Two-Phase Flow at the Pore-Scale Using the Volume of Fluid Method
… injection and on the balance of viscous and capillary forces in immiscible displacements.
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Experimental determination of the flow parameters involved in moisture migration through fiberglass insulation materials
… the role of gravitational and surface tension forces in the migration of liquid water through fiberglass insulation materials. Straightforward experimental procedures were devised to effectively isolate and quantify flow parameters considered important in describing the flow mechanisms …
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The effects of capillarity on photonic crystal selective emitters
… of the most notable being surface evolution by capillary forces. By comprehensively simulating the morphological and optical effects of this phenomenon, in the form of surface diffusion, vapor transport, and grain boundary grooving, this thesis seeks to understand its consequences and attempts …
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Fog Harps: Elastocapillarity, Droplet Dynamics, and Optimization
… First, we analyze wire tangling in a harp due to capillary forces, resulting in a mathematical model that is able to predict when wire tangling will occur. Second, we systematically vary three key parameters of a fog harp (wire material, center-to-center wire pitch, and wire length), arriving at …
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Development of Innovative Microfluidic Polymeric Technologies for Point-of-care & Integrated Diagnostics Devices
… alternating the predominance of centrifugal and capillary forces. With this technique, liquid volumes of μL to mL can be sampled with many sizes of microfluidic channels that contain only a fraction of the sample at one time, provided the channel wall with greatest surface area is hydrophilic. We …
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Process-morphology-property Relationships in Strut-like Poly(ether ether ketone) Aerogels Prepared through Thermally Induced Phase Separation
… robust such that they could resist the forces imposed on the gel during drying. Monolithic strut-like PEEK or PPS aerogels were prepared with vacuum-drying, freeze-drying, and supercritical CO2 extraction with minimal shrinkage and deformation. The weaker globular PEEK aerogel …
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Surfactant enhanced mobilisation of non-aqueous phase liquids
… quantity relating viscous and buoyancy forces to the capillary forces trapping the NAPL residual. A highly reliable experimental apparatus and procedure were developed to study the effect of flow rate and surfactant concentration on the removal of a residual NAPL. Column studies were …
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Mechanical and electrical properties of micro-architectured carbon nanotube sheet
… density from the synthesis process by using capillary forces. I studied a method for removing the CNT sheets from the growth substrate and protocols to test their tensile strength, tearing energy and electrical conductivity at different growth height. The highest tensile strength measured is …
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Investigation of Shrinkage Mechanisms in Hydrated and Carbonated Tricalcium Silicate Systems
… in which shrinkage occurs. At high humidities capillary forces result in additional shrinkage, which increases considerably with increase in capillary porosity. Irreversible shrinkage is thought to confirm the two shrinkage mechanisms proposed. The irreversible fraction of total drying …
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Mass transfer from non-aqueous phase liquids to the aqueous phase in groundwater systems
… non-aqueous phase liquids (NAPL's) is trapped by capillary forces and remains in the subsurface as immobile blobs or ganglia. Residual saturations of NAPL on the order of 5-30 percent have been observed in saturated subsurface systems. The NAPL can partition into the aqueous phase and serve as a …
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Soil suction and swell behavior of chemically treated expansive clays
… conductivity probe. Matric suction arises from capillary forces, soil texture, and adsorption forces of clay particles. Osmotic suction results from the balance of salt concentrations in soil water. When soils were reacted with chemical stabilizers, the osmotic suction dramatically increased due …
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Adhesive and frictional tarsal pads in stick insects
… to a lower elastic modulus and higher adhesive forces. Its secretion contains a higher proportion of methylated cuticular hydrocarbons (CHCs), which are likely to increase fluidity and promote capillary forces. In contrast, the euplantulae feature denser, thinner cuticle fibers, resulting in …
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