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Experimental and numerical study of the evaporation of a pure water drop on a salt surface

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Abstract

When a pure water drop evaporates on a salt substrate, it experiences the simultaneous dissolution of the solid, evaporation of the liquid, advection of the dissolved species, and nucleation and growth of a salt deposit in the constrained geometry of the pinned drop. This complex configuration induces two original behaviors compared to other drop desiccation situations. First the initial flow inside the drop is a solutal Marangoni loop, due to the vertical concentration gradient stemming from the salt dissolution. Then a centrifugal coffee-stain-type flow progressively replaces this loop, owing to the homogenization of the concentration. The transition from the first to the second flow pattern proceeds via a circular stagnation line migrating centripetally. Secondly, the final deposit is a thin shell forming either inclined walls or a hollow circular rim, an uncommon morphology of stain. We show here that these features are robust, being obtained in a wide range of drop radius, contact angle, temperature, and relative humidity.

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Availability of data and materials

The authors declare that the data supporting the findings of this study are available within the paper. Should any raw data files be needed in another format, they are available from the corresponding author upon reasonable request.

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Acknowledgements

We thank Olivier Pierre-Louis for fruitful discussions, Gilles Simon, Agnès Piednoir, Rémy Fulcrand, and François Gay for experimental help.

Funding

The experimental research leading to these results (by A.M., C.P., C.R. and J.C.) received funding from the Centre National d’Études Spatiales (CNES, French Space Agency) and the Centre National de la Recherche Scientifique (CNRS) and the numerical experiments (by I.V.V.) were supported by the Russian Science Foundation (Grant No. 22-79-10216).

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Authors and Affiliations

  1. Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS UMR 5306, Campus de la Doua, Villeurbanne, 69622, France

    Alexandra Mailleur, Christophe Pirat, Charlotte Rivière & Jean Colombani

  2. Laboratory of mathematical modeling, Astrakhan Tatishchev State University, Astrakhan, 414056, Russia

    Irina Vodolazskaya

Authors
  1. Alexandra Mailleur
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  2. Christophe Pirat
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  3. Charlotte Rivière
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  4. Irina Vodolazskaya
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  5. Jean Colombani
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Contributions

Alexandra Mailleur: investigation, methodology, conceptualization, writing—review and editing; Christophe Pirat: investigation, methodology, conceptualization, supervision, funding acquisition, project administration, writing—review and editing; Charlotte Rivière: investigation, methodology, writing—review and editing; Irina Vodolazskaya: investigation, formal analysis, methodology, conceptualization, supervision, writing—review and editing; Jean Colombani: investigation, methodology, conceptualization, supervision, funding acquisition, project administration, writing - original draft.

Corresponding author

Correspondence to Jean Colombani.

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Mailleur, A., Pirat, C., Rivière, C. et al. Experimental and numerical study of the evaporation of a pure water drop on a salt surface. Eur. Phys. J. Spec. Top. (2024). https://doi.org/10.1140/epjs/s11734-024-01119-0

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