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Showing 1 to 20 of 52 for “"Marangoni"”.
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Active emulsion droplets driven by Marangoni flow
… schwimmen. Der zugrundeliegende Effekt heißt Marangoni-Effekt. Eine Möglichkeit den Marangoni-Effekt zu nutzen um einen Tropfen in Bewegung zu setzen, basiert auf einer chemischen Reaktion von grenzflächenaktiven Molekülen, sogenannten Tensiden, mit Brom. Ein mit Brom angereicherter Tropfen, …
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Modeling Temperature Dependence in Marangoni-driven Thin Films
… studied using this approach. Thermal Marangoni stress</p><p>drives fluid motion against the resistance of gravity, with the parameter</p><p>regime being chosen such that these stresses lead to a stable advancing front.</p><p>Additional localized thermal Marangoni stress is used to …
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The effect of Gibbs adsorption on Marangoni Instability
… by the critical value of a dimensionless Marangoni number. A theoretical analysis, for the case in which a surface tension-lowering solute transfers from a liquid according to penetration theory, shows that adsorption of the solute in the Gibbs layer, at the gas-liquid interface, has a …
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Numerik für die Marangoni-Konvektion beim Floating-Zone Verfahren
… <br>und der Oberflächenspannung (Marangonikonvektion) bewirken eine i.a. <br>dreidimensionale Strömung in der Schmelze, die das Kristallwachstum <br>entscheidend beeinflusst. <br>In dieser Arbeit werden Stoff- und Wärmetransport in einer Floating-Zone <br>unter Berücksichtigung der …
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Hydrodynamics Of Drops And Particles Driven By Marangoni And Diffusiophoretic Forces
… liquid drop to form a compound drop/particle. Marangoni forces induced by asymmetric solute adsorption at the liquid-liquid interface of the drop propels the compound system. The propulsion speeds of the motor are analyzed for various relative sizes and configurations of the Janus particle and …
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Direct computations of marangoni driven flows using a volume of fluid method
The volume of fluid (VoF) interface tracking methods have been used for simulating a wide range of interfacial flows. An improved accuracy of the surface tension force computation has enabled the VoF method to become widely used for simulating flows driven by the surface tension force. A general …
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Experiments in turbulent soap-film flows: Marangoni shocks, frictional drag, and energy spectra
… in our experiments) that the film is in the Marangoni regime, i.e., that as the flow moves through the shock there is no time for diffusional exchange of soap molecules between the bulk and the faces of the film, so that the concentration of soap molecules in the bulk of the film remains …
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The Influence of Heats of Solution on The Marangoni Effect in Liquid-Liquid Extraction
Made available in DSpace on 2014-12-10T21:24:47Z (GMT). No. of bitstreams: 1 7212208.pdf: 6400412 bytes, checksum: 9eaec37c53ddb6a8b73778c8d0af38ff (MD5) Previous issue date: 1971
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INTERFACIAL DYNAMICS OF DROP COALESCENCE AND IMPINGING LIQUID JETS: EFFECT OF VISCOUS, MARANGONI AND SHEAR-THINNING STRESSES
… contact. The analysis reveals how interfacial (Marangoni) stresses induced by uneven accumulation of surfactant control the rate at which the drops coalesce by modulating the pull of surface tension on the tiny meniscus bridge joining the drops. Simulations also enabled the analysis of the …
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INTERFACIAL DYNAMICS OF DROP COALESCENCE AND IMPINGING LIQUID JETS: EFFECT OF VISCOUS, MARANGONI AND SHEAR-THINNING STRESSES
… contact. The analysis reveals how interfacial (Marangoni) stresses induced by uneven accumulation of surfactant control the rate at which the drops coalesce by modulating the pull of surface tension on the tiny meniscus bridge joining the drops. Simulations also enabled the analysis of the …
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Surfactant instabilities on thin films
… normalized wavelength, [lambda]/t, scales with Marangoni number, Ma=[Delta][gamma]t/[mu]D, to the -1 exponent for any Marangoni higher than 4.3 · 10⁷. On the other end, for Marangoni < 4.3 · 10⁷ the normalized wavelength scales with Ma to the -0.4 but becomes in addition a funcion of the Prandtl …
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Derivation of an Evolution Equation for Two-Dimensional Waves on Thin Films
… to gravity, fluid friction, surface tension, and Marangoni effects. The physical configuration is a thin liquid layer on a planar incline. Following previous studies, the Marangoni effect is incorporated by a constant surface tension gradient and yields a non-convex flux function in our thin film …
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Modeling of Multi-Component Fuel Vaporization for Spray Simulations Using Continuous Thermodynamics
… on drop-bubble dynamics and instability with Marangoni effects is also given. This issue is motivated by its potential application for improving air-fuel mixing and understanding the possible drop-bubble breakup mechanism.
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Investigation of Thermocapillary Flows Around Hemispherical Bubbles
… using numerical solutions for a wide range of Marangoni numbers (up to 10('6)). Natural convection effects and mass transfer at the bubble interface were included. Two distinct boundary conditions were examined: constant wall heat flux and constant wall temperature. A second order finite …
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Bursting bubbles and water-to-air-transfer : interplay between underlying physics and microbial contamination
… surface bubbles. First, we showed that a global Marangoni flow on bubbles cap due to temperature differences, evaporation, and presence of chemicals such as in saltwater can significantly alters the thinning and lifetime of bubbles. This Marangoni dynamics shapes the drainage and thickness …
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On convection and stability of some welding and solidification processes
… this convection is crucially affected by the Marangoni (or thermocapillary) force. Recently Craine and Belgrove ([30],[7]) have developed a two-dimensional, axisymmetric model which includes the Marangoni force on the free surface of a semi-infinite region of liquid steel when a point source …
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Modeling of melt pool thermal behavior in laser material
… interaction, such as phase changes and the Marangoni effect. Since the melt pool dynamics is primarily driven by the interfacial forces, which in turn rely considerably on the melt pool geometry, a free surface tracking method associated with the numerical implementation scheme is proposed. …
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Thermo-Capillary Driven Flow Under the Influence of Rotation and Magnetic Fields
… first part, the main parameters are the solutal Marangoni number Mc, representing the surface tension gradient force and the Taylor number Ta representing the rotational effect. For given values of Mc, certain values of Ta were detected where the Sherwood number Sh, representing the convective …
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Computer aided floating zone growth of Germanium-Silicon crystals in a resistance heated multi-zone furnace
… numerical simulations, the influence of solutal Marangoni convection on species transfer in a floating <br>zone could be qualitatively explained. The instability mechanism <br>of thermocapillary convection in a low Pr floating zone could be <br>attributed to the interaction of buoyancy convection …
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