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Poster De Conférence Année : 2019

Order-Disorder Structural Transitions in Mazes Built by Evaporating Drops

Pascal Panizza
Guillaume Raffy
Laurent Courbin
Franck Artzner

Résumé

Evaporation is central to many industrial and natural processes. Understanding the evaporation of liquid dispersions in porous media is important for various disciplines, e.g., soil physics and civil engineering, and diverse processes such as the underground sequestration sequestration of CO2. The key issue in most cases is to comprehend the creation, locus and morphology of the solid deposits formed during drying. For instance, this topic is crucial in civil engineering as salt weathering can cause severe damage to the built environment and in material science as evaporation can help the design of novel smart material. Yet, the development of models for drying in porous media and the proper description of the formation of deposits in such media have remained elusive as these tasks are generally challenging. Here, we study the evaporation of surfactant solutions in porous media consisting of micron-sized cylindrical posts arranged on square or rectangular lattices. Our evaporation devices are transparent and quasi two-dimensional. These two essential attributes allow us to precisely determine how and where solid deposits form during drying. We show that the evaporation of surfactant solutions confined in quasi-2D porous media creates micron-sized labyrinthine patterns composing the walls of a centimeter-sized maze. These walls are made of solid deposits formed during drying via a sequence of individual Haines jumps, resulting from an hydrodynamic instability occurring at the pore scale. We rationalize this process driven by simple iterative rules with a cellular automaton that acts as a maze generator. This model well describes the formation dynamics and final structure of an experimental maze as functions of the wettability heterogeneities of a porous medium and its geometry. Also, our findings unveil the crucial role of two geometric dimensionless quantities that control the structural order of a maze [1].
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Dates et versions

hal-02330426 , version 1 (24-10-2019)

Identifiants

  • HAL Id : hal-02330426 , version 1

Citer

Pascal Panizza, H. Algaba, M. Postic, Guillaume Raffy, Laurent Courbin, et al.. Order-Disorder Structural Transitions in Mazes Built by Evaporating Drops. Annual European Rheology Conference, Apr 2019, Portoroz, Slovenia. ⟨hal-02330426⟩
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