TY - JOUR
T1 - Dynamics of retracting surfactant-laden ligaments at intermediate Ohnesorge number
AU - Constante-Amores, Cristian R.
AU - Kahouadji, Lyes
AU - Batchvarov, Assen
AU - Shin, Seungwon
AU - Chergui, Jalel
AU - Juric, Damir
AU - Matar, Omar K.
N1 - This work is supported by the Engineering & Physical Sciences Research Council, United Kingdom, through a studentship for R.C.-A. in the Centre for Doctoral Training on Theory and Simulation of Materials at Imperial College London funded by the EPSRC (Grant No. EP/L015579/1) (Award Reference No. 1808927), and through the EPSRC MEMPHIS (Grant No. EP/K003976/1) and PREMIERE (EP/T000414/1) Programme Grants. O.K.M. acknowledges funding from PETRONAS and the Royal Academy of Engineering for a Research Chair in Multiphase Fluid Dynamics. We also acknowledge the Thomas Young Centre under Grant No. TYC-101. D.J. and J.C. acknowledge support through computing time at 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. 2020A0082B06721. The numerical simulations were performed with code BLUE and the visualisations have been generated using ParaView.
PY - 2020/8
Y1 - 2020/8
N2 - The dynamics of ligaments retracting under the action of surface tension occurs in a multitude of natural and industrial applications; these include inkjet printing and atomization. We perform direct, fully three-dimensional, two-phase numerical simulations of the retracting process over a range of system parameters that account for surfactant solubility, sorption kinetics, and Marangoni stresses. Our results indicate that the presence of surfactant inhibits the "end-pinching"mechanism and promotes neck reopening through Marangoni-flow; this is induced by the formation of surfactant concentration gradients that drive flow-reversal toward the neck. The vortical structures associated with this flow are also analyzed in detail. We also show that these Marangoni stresses lead to interfacial rigidification, observed through a reduction of the retraction velocity and ligament kinetic energy.
AB - The dynamics of ligaments retracting under the action of surface tension occurs in a multitude of natural and industrial applications; these include inkjet printing and atomization. We perform direct, fully three-dimensional, two-phase numerical simulations of the retracting process over a range of system parameters that account for surfactant solubility, sorption kinetics, and Marangoni stresses. Our results indicate that the presence of surfactant inhibits the "end-pinching"mechanism and promotes neck reopening through Marangoni-flow; this is induced by the formation of surfactant concentration gradients that drive flow-reversal toward the neck. The vortical structures associated with this flow are also analyzed in detail. We also show that these Marangoni stresses lead to interfacial rigidification, observed through a reduction of the retraction velocity and ligament kinetic energy.
UR - http://www.scopus.com/inward/record.url?scp=85092065296&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85092065296&partnerID=8YFLogxK
U2 - 10.1103/PhysRevFluids.5.084007
DO - 10.1103/PhysRevFluids.5.084007
M3 - Article
AN - SCOPUS:85092065296
SN - 2469-990X
VL - 5
JO - Physical Review Fluids
JF - Physical Review Fluids
IS - 8
M1 - 084007
ER -