Influence of the relative humidity influence on the salt deposit after the evaporation of a saline sessile droplet - CEA - Commissariat à l’énergie atomique et aux énergies alternatives
Article Dans Une Revue European Journal of Mechanics - B/Fluids Année : 2022

Influence of the relative humidity influence on the salt deposit after the evaporation of a saline sessile droplet

Cécile Lalanne
  • Fonction : Auteur
Anaëlle Givaudan
  • Fonction : Auteur
Paul Bonmendil
  • Fonction : Auteur
José-Maria Fullana
  • Fonction : Auteur

Résumé

We report experimental observations of salt deposits after complete evaporation of a sessile droplet containing sodium chloride, and we provide quantitative and qualitative information to the understanding of the complex mechanisms involved in the evaporation problem. We define precisely two regimes as function of the initial concentration of solute : coffee-ring and Marangoni driven flow, the last one is well determined by the surface tension variation as function of salt concentration. We propose a solutal instability mechanism in agreement with our experimental results and those found in literature. For the solute crystallization and final deposits we observe two phases : the first phase without crystal development from the initial time to 65 % of the evaporation time, and the second one where the chemical process of crystallization appears. In the second phase we provide quantitative data of the crystallization process using the normalized average distance between crystals as a function of relative humidity and the initial salt concentration
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Dates et versions

cea-04754538 , version 1 (25-10-2024)

Identifiants

  • HAL Id : cea-04754538 , version 1

Citer

Cécile Lalanne, Anaëlle Givaudan, Paul Bonmendil, José-Maria Fullana, Florence Lequien. Influence of the relative humidity influence on the salt deposit after the evaporation of a saline sessile droplet. European Journal of Mechanics - B/Fluids, 2022, pp.1-8. ⟨cea-04754538⟩
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