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Three-dimensional direct numerical simulations of the dynamics of retracting surfactant-laden ligaments

Abstract : The dynamics of ligaments retracting under the action of surface tension occurs in a multitude of natural and industrial applications, such as inkjet printing and atomisation. We perform fully three-dimensional, two-phase direct numerical simulations of the retraction dynamics with soluble surfactants. A full parametric study is performed using a hybrid interface-tracking/level-set method, which is utilised to treat the interface; this method is capable of capturing faithfully the topological transitions that are a feature of the flow over a certain range of ligament aspect ratios and Ohnesorge numbers. Our results demonstrate the delicate interplay between capillarity, modulated by the presence of surfactants, surfactant-induced Marangoni stresses, inertial and viscous effects. Particular attention is paid to the formation of vortices, which accompany the retraction process, and the influence of surfactant on the vortex dynamics.
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https://hal.archives-ouvertes.fr/hal-02610695
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Soumis le : mardi 26 mai 2020 - 20:25:05
Dernière modification le : vendredi 9 octobre 2020 - 10:03:22

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Cristian R. Constante-Amores, Lyes Kahouadji, Assen Batchvarov, Omar K. Matar, Seungwon Shin, et al.. Three-dimensional direct numerical simulations of the dynamics of retracting surfactant-laden ligaments. Physical Review Fluids, American Physical Society, 2020, 5, pp.084007. ⟨10.1103/PhysRevFluids.5.084007⟩. ⟨hal-02610695⟩

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