Role of surfactant-induced Marangoni stresses in retracting liquid sheets

Constante-Amores C. R. , Chergui J. (1) , Shin S. , Damir Juric (2, 1) , Castrejón-Pita J. R. , Castrejón-Pita A. A.

1 LISN - Laboratoire Interdisciplinaire des Sciences du Numérique
2 COMET - COuplages Multiphysiques Et Transferts

In this work, we study the effect of insoluble surfactants on the three-dimensional rim-driven retraction dynamics of thin water sheets in air. We employ an interfacetracking/level-set method to ensure the full coupling between the surfactant-induced Marangoni-stresses, interfacial diffusion, and inertia. Our findings are contrasted with the (Newtonian) dynamics of a liquid sheet edge finding that the surfactant concentration can prevent, or delay, the breakup of the rim. Our simulations use the fastest growing Rayleigh-Plateau instability to drive droplet detachment from the fluid sheet (rim). The results of this work unravel the significant role of Marangoni stresses in the retracting sheet dynamics at large elasticity numbers. We study the sensitivity of the dynamics to the elasticity number and the rigidification of the interface.

Domains: Engineering Sciences [physics]; Nonlinear Sciences [physics]

Constante-Amores C. R., Chergui J., Shin S., Damir Juric, Castrejón-Pita J. R., et al.. Role of surfactant-induced Marangoni stresses in retracting liquid sheets. Journal of Fluid Mechanics, In press. ⟨hal-03765664⟩