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 17 of 17 for “"Three-Phase Contact Line"”.
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Dynamics and Statics of Three-Phase Contact Line
… chemistry, micro/nanofluidic devices, and phase change heat transfer enhancement. Generally, wetting is governed by the dynamic and static behaviors of the three-phase contact line. Therefore, a deep insight into the dynamics and statics of three-phase contact line at nanoscale is necessary …
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Penetration of Surfactant Solutions into Capillaries
… of deviation from Lucas-Washburn behaviour. Three theoretical models were compared to the experimental data: (I) The Lucas-Washburn model, (II) A “Young” model and (III) Overflowing cylinder model. All these models are shown to be unable to account for the observed penetration rates. The …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… that the majority of heat transfer occurs at the three phase contact line, where the local heat flux can be up to 4 orders of magnitude higher than at the droplet top. Droplet distribution theory is incorporated to show that previous modeling approaches under predict the overall heat transfer by …
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Using Anisotropic Micro-Scale Topography to Manipulate the Wettability of Aluminum and Reduce the Retention of Water
… exhibit significantly increased apparent contact angles, and for water condensed onto an inclined, micro-grooved surface, the droplet volume at incipient sliding is reduced by more than 50% compared to droplets on a surface without micro-grooves. No chemical surface treatment is necessary …
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Sessile droplets of salt solutions on inert and metallic surfaces
… behaviour of sessile droplets of aqueous saline solutions on planar inert and metallic surfaces and characterise the corrosion phenomenon for iron surfaces. First we study the evaporation behaviour of sessile salty droplets on inert surfaces for a wide range of salt concentrations, relative …
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Capillary forces and wetting dynamics by diffuse-interface modeling
… the lungs to the thin coating of surfaces. The three-phase interactions involved at microscopic scales play a critical role. Adding solid particles to an emulsion, for example, can drastically change the flow behavior due to capillary bridging between the particles. The study of these …
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Wetting hysteresis and droplet roll off behavior on superhydrophobic surfaces by Katherine Marie Smyth.
… difference between the advancing and receding contact angle and after many decades of research, the mechanisms governing hysteresis are still not fully understood. Particularly, stick-slip behavior of the three-phase contact line has been observed and qualitatively attributed to surface or …
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Investigating Wetting Characteristics on Microstructured Surfaces for Superhydrophobicity and Metal Microcasting
… and opaque microstructured surfaces to determine contact line. This dissertation also presents measurements and models for how curvature and flexing of microstructured polymers affects hydrophobicity. Increasing curvature of microstructured surfaces leads to decreased slide angle for liquid …
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Fundamentals of microlayer evaporation and its role on boiling heat transfer enhancement
… the bubble growth rate and departure frequency. Three enhancement regions are mapped based on ridge spacing and height: full enhancement region, partial enhancement region, and no enhancement region. The mechanism of early evaporation of microlayer is further verified by comparison of the bubble …
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Droplet evaporation dynamics on surfaces
… in nanotechnology, many surfaces for two phase heat transfer have been developed including hydrophobic, biphilic and lubricantinfused surfaces. However, evaporation of droplets on these surfaces have not been explored in depth. Traditionally, evaporation on surfaces was characterized by …
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Force and Energy Measurement of Bubble-Particle Detachment
… using a submerged hydrophobic plate in water. Three experiments were used; direct force measurement of bubble-particle detachment, detachment force and energy of a bubble from a submerged hydrophobic plate, and detachment force and energy of a cetyltrimethylammonium bromide coated silica sphere …
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Capillary Assembly Of Microparticles On Curved Fluid Interfaces
… of microdisks and spheres that are pinned at the three-phase contact line due to surface roughness. These particles have radius much smaller comparing to the radius of curvature; they induce nanometric deformation on the interface and still create significant interface distortion and capillary …
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Phase separation in giant vesicles
… contain several spatial compartments formed by phase separation within their enclosed aqueous solution. This phenomenon might be related to molecular crowding, fractionation and protein sorting in cells. To elucidate this process we used two chemically dissimilar polymers, polyethylene glycol …
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Influencing contact-line behavior in dynamic wetting through thermocapillarity and surface topography
… surrounding air to coat a moving substrate. A three-phase contact line is present wherever the solid surface, and the advancing and receding fluids intersect. Controlling the behavior of contact lines is key to improving the efficiency of industrial processes. The work in this thesis focuses on …
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Investigating wetting characteristics on microstructured surfaces for superhydrophobicity and metal microcasting
… and opaque microstructured surfaces to determine contact line. This dissertation also presents measurements and models for how curvature and flexing of microstructured polymers affects hydrophobicity. Increasing curvature of microstructured surfaces leads to decreased slide angle for liquid …
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Investigating silicone oil emulsification in eye chamber models
… at the interface between oil-aqueous phases. The stability of the interface was investigated over an extensive range of experimental scenarios, supported by analytical and numerical calculations. The addition of surfactant to the aqueous phase modelled the effect of surface-active …
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FLOW FORMING OF CAPILLARY INTERFACES: DROP IMPACT AND THE MOBILE CONTACT LINE
… transforms into fast-time scale motion of the three-phase contact-line (CL). The CL then comes to rest and the LG interface oscillates, viscously dissipating remaining energy on a slow-time scale. The energetics of drop deposition are characterized by high Reynolds number and moderate Weber …