Confinement effects in surfactant-driven Marangoni flows
il y a 1 semaine
Topic description Recently, we have observed that surfactants deposited on liquid films can cause complex flows in confined environments. Surfactants are molecules typically found in soaps, but also in other substances. They can alter the surface tension between two phases, such as a liquid phase (water) and a gas phase (air). When the concentration of surfactants at an air-water interface is non-uniform, this creates a Marangoni tension, which leads to the spreading of the surfactants to even out their concentration. In most liquids, there is a trace of endogenous surfactants at very low concentrations, due to natural contamination. These endogenous surfactants can interact with exogenous surfactants locally deposited on the interface and alter the Marangoni-driven spreading. This can lead, for example, to flows capable of solving a maze (photo on the left and our , ). There are also important applications in medicine. Surfactant therapies are used to treat lung diseases, in order to transport therapeutic drugs down to the lung alveoli, where gravity does not play a role. Our preliminary work (The aim of this doctoral thesis is to validate experimentally existing theoretical models and develop them further in order to understand the interaction between endogenous and exogenous surfactants in complex confined geometries. Simple and advanced imaging techniques with dyes and tracers, such as particle tracking and PIV, will be used to obtain experimental data. Theoretical and numerical tools will be used to develop the models for their experimental validation. The LMFA is an internationally recognized research laboratory in fluid mechanics, and part of a dynamic research and industrial environment in the Metropole of Lyon. The candidate will benefit from strong support within this lab, which hosts a large international community of PhD students each year. It is located in the heart of the city of Lyon, which offers a dynamic and stimulating environment for research and student life. Starting date -09-15 Funding category Other public funding Funding further details China Scholarship Council (CSC)
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Confinement effects in surfactant-driven Marangoni flows
il y a 1 semaine
Villeurbanne, Auvergne-Rhône-Alpes, France Université Claude Bernard Lyon 1 Temps pleinConfinement effects in surfactant-driven Marangoni flowsRéf ABG-134788Sujet de Thèse15/12/2025Autre financement publicUniversité Claude Bernard Lyon 1Lieu de travailVilleurbanne - Auvergne-Rhône-Alpes - FranceIntitulé du sujetConfinement effects in surfactant-driven Marangoni flowsChamps scientifiquesSciences de l'ingénieurMathématiquesPhysiqueMots...
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il y a 1 semaine
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il y a 7 jours
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il y a 1 semaine
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