Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Marangoni instability triggered by selective evaporation of a binary
  liquid inside a Hele-Shaw cell   Interfacial stability is important for many processes involving heat and mass
transfer across two immiscible phases. When this transfer takes place in the
form of evaporation of a binary solution with one component being more volatile
than the other, gradients in surface tension can arise. These gradients can
ultimately destabilise the liquid-gas interface. In the present work, we study
the evaporation of an ethanol-water solution, for which ethanol has a larger
volatility. The solution is contained in a horizontal Hele-Shaw cell which is
open from one end to allow for evaporation into air. A Marangoni instability is
then triggered at the liquid-air interface. We study the temporal evolution of
this instability by observing the effects that it has on the bulk of the
liquid. More specifically, the growth of convective cells is visualized with
confocal microscopy and the velocity field close to the interface is measured
with micro-particle-image-velocimetry. The results of numerical simulations
based on quasi 2D equations satisfactorily compare with the experimental
observations, even without consideration of evaporative cooling, although this
cooling can play an extra role in experiments. Furthermore, a linear stability
analysis applied to a simplified version of the quasi 2D equations showed
reasonably good agreement with the results from simulations at early times,
when the instability has just been triggered and no coarsening has taken place.
In particular, we find a critical Marangoni number below which a regime of
stability is predicted.

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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph