Marangoni effect


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Marangoni effect

[‚mär·äŋ′gō·nē i‚fekt]
(chemical engineering)
The effect that a disturbance of the liquid-liquid interface (due to interfacial tension) has on mass transfer in a liquid-liquid extraction system.
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17] found that the negative Marangoni effect in the magnesium alloy composition enhanced the heat transfer in the molten pool by driving melt flows, making the molten pool shape wider and shallower.
This mass transfer is known as the Marangoni effect [7].
The Marangoni effect (also called the GibbsMarangoni effect) is the mass transfer along an interface between two fluids due to surface tension gradient.
Hence polymer concentration is a major controller parameter to minimize Marangoni effect.
The Marangoni effect is the mass-transfer of the fluids with different surface tension along the interface.
Altshuler and colleagues speculate, the upstream vortex is being reinforced by a Marangoni effect associated with a decrease of the surface tension in the lower reservoir caused by increasing the amount of floating chalk dust or mate leaves.
Professor Geoff Stevens from the University of Melbourne's Department of Chemical and Biomolecular Engineering says while it's possible, he doesn't think Marangoni effects, or the normal diffusion of the chalk or leaf particles from areas of high to low density are involved.
Researchers struggle to study this effect on Earth because gravity induces a density driven convection that is much stronger than the surface tension driven Marangoni effect.
It is known as the Marangoni effect (Ivanov and Dimitrov, 1988; Yeo et al.
On the other hand, this isotropy is broken near the drop surface and the distribution of surfactant molecules may be irregular (for instance, when the Marangoni effect occurs the isotropy is lost, giving rise to gradients of interfacial tension).
The main objective of our study is to extend previous research to the solutal Marangoni effect and mass diffusion.
From Figure 3(a), it can be seen that when the Hartmann number Ma increases, at the beginning, the velocity decreases slightly due to the fact that magnetic field produces a drag, and then the velocity near the surface of the thin film rises up gradually under the Marangoni effect, which explains the emergence of the intersection.