Three-dimensional dynamics of falling films in the presence of insoluble surfactants
- Authors
- Batchvarov; A.; Kahouadji; L.; Constante-Amores; C.R.; Nor?es Gon?alves; G.F.; Shin; S.; Chergui; J.; Juric; D.; Craster; R.V.; Matar; O.K.
- Issue Date
- 10-Jan-2021
- Publisher
- CAMBRIDGE UNIV PRESS
- Citation
- Journal of Fluid Mechanics, v.906
- Journal Title
- Journal of Fluid Mechanics
- Volume
- 906
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/12400
- DOI
- 10.1017/jfm.2020.796
- ISSN
- 0022-1120
- Abstract
- We study the effect of insoluble surfactants on the wave dynamics of vertically falling liquid films. We use three-dimensional numerical simulations and employ a hybrid interface-tracking/level-set method, taking into account Marangoni stresses induced by gradients of interfacial surfactant concentration. Our numerical predictions for the evolution of the surfactant-free, three-dimensional wave topology are validated against the experimental work of Park & Nosoko (AIChE J., vol. 49, 2003, pp. 2715-2727). The addition of surfactants is found to influence significantly the development of horseshoe-shaped waves. At low Marangoni numbers, we show that the wave fronts exhibit spanwise oscillations before eventually acquiring a quasi-two-dimensional shape. In addition, the presence of Marangoni stresses is found to suppress the peaks of the travelling waves and preceding capillary wave structures. At high Marangoni numbers, a near-complete rigidification of the interface is observed.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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