TY - JOUR
T1 - Role of surfactant-induced Marangoni stresses in retracting liquid sheets
AU - Constante-Amores, C. R.
AU - Chergui, J.
AU - Shin, S.
AU - Juric, D.
AU - Castrejón-Pita, J. R.
AU - Castrejón-Pita, A. A.
N1 - C.R.C.-A. and A.A.C.-P. acknowledge the support from the Royal Society through a University Research Fellowship (URF/R/180016), an Enhancement Grant (RGF/EA/181002) and two NSF/CBET-EPSRC grants (Grant Nos. EP/S029966/1 and EP/W016036/1). All authors are grateful by the computing time granted by the Institut du Developpement et des Ressources en Informatique Scientifique (IDRIS) of the Centre National de la Recherche Scientifique (CNRS), coordinated by GENCI (Grand Equipement National de Calcul Intensif) Grant No. 2022A0122B06721. Simulations were performed using code BLUE (Shin, Chergui & Juric ) and the visualisations were generated using Paraview.
PY - 2022/10/25
Y1 - 2022/10/25
N2 - 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 interface-tracking/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 delay, or effectively prevent, 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.
AB - 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 interface-tracking/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 delay, or effectively prevent, 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.
KW - breakup/coalescence
KW - capillary flows
KW - drops
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U2 - 10.1017/jfm.2022.768
DO - 10.1017/jfm.2022.768
M3 - Article
AN - SCOPUS:85140777289
SN - 0022-1120
VL - 949
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
M1 - A32
ER -