dorsal/arxiv
View SchemaMarangoni Convection in Binary Mixtures
| Authors | Jie Zhang, Robert P. Behringer, Alexander Oron |
|---|---|
| Categories | |
| ArXiv ID | physics/0612002 |
| URL | https://arxiv.org/abs/physics/0612002 |
| DOI | 10.1103/PhysRevE.76.016306 |
Abstract
Marangoni instabilities in binary mixtures are different from those in pure liquids. In contrast to a large amount of experimental work on Marangoni convection in pure liquids, such experiments in binary mixtures are not available in the literature, to our knowledge. Using binary mixtures of sodium chloride/water, we have systematically investigated the pattern formation for a set of substrate temperatures and solute concentrations in an open system. The flow patterns evolve with time, driven by surface-tension fluctuations due to evaporation and the Soret effect, while the air-liquid interface does not deform. A shadowgraph method is used to follow the pattern formation in time. The patterns are mainly composed of polygons and rolls. The mean pattern size first decreases slightly, and then gradually increases during the evolution. Evaporation affects the pattern formation mainly at the early stage and the local evaporation rate tends to become spatially uniform at the film surface. The Soret effect becomes important at the later stage and affects the mixture for a large mean solute concentration where the Soret number is significantly above zero. The strength of convection increases with the initial solute concentration and the substrate temperature. Our findings differ from the theoretical predictions in which evaporation is neglected.
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"abstract": "Marangoni instabilities in binary mixtures are different from those in pure\nliquids. In contrast to a large amount of experimental work on Marangoni\nconvection in pure liquids, such experiments in binary mixtures are not\navailable in the literature, to our knowledge. Using binary mixtures of sodium\nchloride/water, we have systematically investigated the pattern formation for a\nset of substrate temperatures and solute concentrations in an open system. The\nflow patterns evolve with time, driven by surface-tension fluctuations due to\nevaporation and the Soret effect, while the air-liquid interface does not\ndeform. A shadowgraph method is used to follow the pattern formation in time.\nThe patterns are mainly composed of polygons and rolls. The mean pattern size\nfirst decreases slightly, and then gradually increases during the evolution.\nEvaporation affects the pattern formation mainly at the early stage and the\nlocal evaporation rate tends to become spatially uniform at the film surface.\nThe Soret effect becomes important at the later stage and affects the mixture\nfor a large mean solute concentration where the Soret number is significantly\nabove zero. The strength of convection increases with the initial solute\nconcentration and the substrate temperature. Our findings differ from the\ntheoretical predictions in which evaporation is neglected.",
"arxiv_id": "physics/0612002",
"authors": [
"Jie Zhang",
"Robert P. Behringer",
"Alexander Oron"
],
"categories": [
"physics.flu-dyn"
],
"doi": "10.1103/PhysRevE.76.016306",
"title": "Marangoni Convection in Binary Mixtures",
"url": "https://arxiv.org/abs/physics/0612002"
},
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