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Direct numerical simulations of turbulent jets: Vortex-interface-surfactant interactions

Journal of Fluid Mechanics, ISSN: 1469-7645, Vol: 955
2023
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Article Description

We study the effect of insoluble surfactants on the spatio-temporal evolution of turbulent jets. We use three-dimensional numerical simulations and employ an interface-tracking/level-set method that accounts for surfactant-induced Marangoni stresses. The present study builds on our previous work (Constante-Amores et al., J. Fluid Mech., vol. 922, 2021, A6) in which we examined in detail the vortex-surface interaction in the absence of surfactants. Numerical solutions are obtained for a wide range of Weber and elasticity numbers in which vorticity production is generated by surface deformation and surfactant-induced Marangoni stresses. The present work demonstrates, for the first time, the crucial role of Marangoni stresses, brought about by surfactant concentration gradients, in the formation of coherent, hairpin-like vortex structures. These structures have a profound influence on the development of the three-dimensional interfacial dynamics. We also present theoretical expressions for the mechanisms that influence the rate of production of circulation in the presence of surfactants for a general, three-dimensional, two-phase flow, and highlight the dominant contribution of surfactant-induced Marangoni stresses.

Bibliographic Details

C. R. Constante-Amores; T. Abadie; L. Kahouadji; O. K. Matar; A. A. Castrejón-Pita; S. Shin; J. Chergui; D. Juric

Cambridge University Press (CUP)

Physics and Astronomy; Engineering; Mathematics

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