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Showing 1 to 20 of 455 for “"contact angle"”.
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Contact angle hysteresis and the energy principle
Experimental evidence suggests that contact angle hysteresis is related, in some cases, to surface roughness or heterogeneity on a microscopic scale. This work investigates the effect of periodic roughness or heterogeneity on quasi-static motion of a liquid/vapor/solid contact line. We determine …
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Investigation of smooth contact angle treatment in porous media
… arise at low capillary numbers. Therefore, the contact angle needs to be carefully treated. Mesoscopic techniques such as lattice Boltzmann methods are capable of dealing with lower capillary numbers as compared to the Navier-Stokes solvers, which can also implicitly capture the interface …
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Contact Angle Of A Nano-Drop On A Heterogeneous Surface
<p>CONTACT ANGLE OF A NANO-DROP ON A HETEROGENEOUS SURFACE By John Andre Ritchie, Master of Science A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University Virginia Commonwealth University, 2010 Major Director: Dr. Alenka …
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Phase-Field Modeling of Oscillatory Wetting Phenomena with Contact Angle Hysteresis
… and Steen examines the connection between the contact line velocity and contact angle of liquid drops on an oscillating substrate that display contact angle hysteresis. Of particular interest in this experimental study is the analysis of the dependence of contact angle deviation on contact line …
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Effect of Contact Angle on Growth of Bubbles Formed From Dissolved Gas
Made available in DSpace on 2014-12-08T23:18:03Z (GMT). No. of bitstreams: 1 6408361.pdf: 8074474 bytes, checksum: ede3f7e10c59070307e171d49701e5dd (MD5) Previous issue date: 1964
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Bi-modal hemispherical sensors for three axis force and contact angle measurement
… robots need to be able to accurately measure contact locations and forces. However, many existing sensors do not satisfy the stringent requirements or do not supply sufficient information for robotic locomotion and manipulation. This thesis builds on work by a previous PhD student, Meng Yee …
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Fuel cells--effect of current on the gas-solution-electrode interface contact angle
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1962.
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Contact Angle Studies on Surfaces of Coal and on Other Surfaces of Low Free Energy
Made available in DSpace on 2014-12-05T19:37:21Z (GMT). No. of bitstreams: 1 6001638.pdf: 4499809 bytes, checksum: 37e18ccc02b555f54ff8d03beeb7edb0 (MD5) Previous issue date: 1960
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Characterizing the spreading behavior of radius, contact angle, and spreading velocity of trisiloxane "superspreader" surfactants:/
… these surfactants. In this study, the radius and contact angle during spreading of different concentrations of trisiloxane ethoxylate are measured in a humidity-controlled box. Consistent with other studies, concentrations above the critical aggregation concentration spread more, resulting in …
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A predictive flotation model based on adsorption, contact angle, coagulation, and solution chemistry in the alkylamine-quartz flotation system
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1984.
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Investigation of growth kinetics of self-assembling monolayers by means of contact angle, optical ellipsometry, angle-resolved XPS and IR spectroscopy.
… ethanol solutions has been studied by means of contact angle, optical ellipsometry, angle-resolved XPS (ARXPS), and with grazing angle total reflection FTIR. Growth of the monolayers from dilute solutions has been monitored and Langmuir isotherm adsorption curves were fitted to experimental …
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Experimental Study of Meniscus Thin-Film Evaporation in a Horizontal-Tube, Falling-Film Heat Exchanger, Focusing on Dynamic Contact Angle Variation of an Advancing Meniscus
… as the meniscus approaches the triple-phase contact line. This phenomenon was found to be more pronounced in evaporation dominant conditions, i.e. low solution subcooling, high wall superheat, and low solution flow rate. Geometric and fluidic properties also have a strong influence on …
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Coalescence Behaviour of Liquid Drops at Solid Surfaces
… behaviour in liquid-vapour-solid systems by contact angles are summarised. Contact angle measurements have been extended to liquid-liquid- solid systems. Five organic liquids and water were investigated using both high and low surface energy solid surfaces. The contact angle varied with the …
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DEVELOPMENT OF MAGNETIC FABRICS WITH TUNABLE HYDROPHOBICITY
… hydrophobicity (as measured using water droplet contact angle) increases in the presence of a magnetic field and the hysterisis in the advancing/receding contact angle (a measure of the stickiness of the surface) decreases in the presence of a magnetic field. It is also shown that the contact …
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Bubble behavior in subcooled flow boiling on surfaces of variable wettability
… at departure to its upstream and downstream contact angles based on a rigid-body force balance between momentum and surface tension and assuming a skewed truncated spherical bubble shape. Both experimental and theoretical results predict that bubble width and height decrease with increasing …
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Surface Free Energy Characterization of Powders
Microcalorimetric measurements and contact angle measurements were conducted to study the surface chemistry of powdered minerals. The contact angle measurements were conducted on both flat and powdered talc samples, and the results were used to determine the surface free energy components using Van …
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Characterization of thin silicone films formed by migration across defined polymer substrates
… reflection absorption spectroscopy (RAS), and contact angle analysis were used to investigate this problem. XPS analysis indicated that the surface spreading or "creeping" was very slow, moving only several centimeters per several hundred hours in some cases. An interesting observation was that …
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How Water Meets a Hydrophobic Surface: Reluctantly and With Flucuations
… interface on variables such as temperature, contact angle, pH, dissolved gasses, and sample quality, among others, in a hope to discover the root of the controversy in the literature. We found that the depletion layer is highly dependent on temperature, contact angle and sample quality. This …
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The role of surfactants in the leaching of zinc sulphide minerals at temperatures above the melting point of sulphur
… tensions and the liquid sulfur-mineral contact angle were measured in a high temperature-high pres-sure apparatus. In the absence of any surfactant, the liquid-liquid interfacial tension measured 54±1 mN/m, and the liquid sulfur-mineral contact angle was 80±5°. In the presence of 0.3 g/L …
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