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Showing 1 to 9 of 9 for “"Marangoni flow"”.
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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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About the role of physico-chemical properties and hydrodynamics on the progress of a precipitation reaction
… angle drops (>90°) in oil, as a model system for flowing drops, the second one correspond to sessile drops in air with low contact angle (<25°). In both cases, one reactive is dissolved in each drop, namely oxalic acid and cerium nitrate. When both drops get into contact, they may coalesce; the …
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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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Fatigue properties of dissimilar metal laser welded lap joints.
… material property differences. The effects of Marangoni flow on the compositions of the laser weld beads are experimentally characterised. The results providing definite proof of the stirring mechanism within the weld pool through the use of speeds maps for chromium and nickel. Keywords: Laser …
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Film Formation via Drying of Polymer Solutions
… pattern formed due to a surface tension-driven flow, initiated by the presence of water within PVP. This instability was suppressed by the removal of water from PVP. These findings were supported by a lubrication approximation analysis, which predicts the instability wavelength and exhibits good …
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Dynamics of Micro-Particles in Complex Environment
… substrate is caused by the evaporation-induced Marangoni flow near the bubble. The actuation of magnetic clusters using non-uniform alternating magnetic fields is studied next. It is discovered that the clusters' clockwise, out-of-plane rotation is a synergistic effect of the magnetophoresis …
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Influencing contact-line behavior in dynamic wetting through thermocapillarity and surface topography
… where it is found that generating a thermal Marangoni flow toward the contact line delays wetting failure to faster substrate speeds, which is crucial for increasing production rates in industrial processes. In the second part, a lubrication-theory-based model is developed to study the motion …
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Experimental investigations of drying droplets containing microparticles and mixtures of Poly(ethylene oxide) microparticles
… a pinned contact line leads to outward radial flow, which is enhanced by the diverging evaporative flux at the contact line. As a result, suspended particles in the drops are transported to the edge of the droplet, and deposited in a circular stain. In the first section of this study, we …
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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 …