Dynamics of retracting surfactant-laden ligaments at intermediate Ohnesorge number
- Authors
- Constante-Amores, Cristian R.; Kahouadji, Lyes; Batchvarov, Assen; Shin, Seungwon; Chergui, Jalel; Juric, Damir; Matar, Omar K.
- Issue Date
- 27-Aug-2020
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW FLUIDS, v.5, no.8
- Journal Title
- PHYSICAL REVIEW FLUIDS
- Volume
- 5
- Number
- 8
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11592
- DOI
- 10.1103/PhysRevFluids.5.084007
- ISSN
- 2469-990X
- Abstract
- 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.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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