Droplet impact on surfactant-laden thin liquid films: Vortex ring dynamics
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914331331919872 |
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| author | Ennayar, Hatim Kim, Hyoungsoo Hussong, Jeanette |
| author_facet | Ennayar, Hatim Kim, Hyoungsoo Hussong, Jeanette |
| contents | Droplet impact on surfactant-laden thin liquid films is investigated experimentally with emphasis on vortex ring dynamics. Bottom- and side-view imaging reveal that increasing surfactant concentration progressively stabilize vortex rings, suppress azimuthal instabilities and promote concentric mixing patterns. A regime map is established in terms of film thickness, Reynolds number, and surface-tension ratio, yielding an empirical instability threshold. Shadowgraphy observations suggest that Marangoni stresses modify early capillary-wave dynamics, potentially altering vortex ring formation and delaying instability onset. These findings clarify the link between interfacial stresses, vortex ring dynamics, and mixing patterns in thin-film droplet impact. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_14118 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Droplet impact on surfactant-laden thin liquid films: Vortex ring dynamics Ennayar, Hatim Kim, Hyoungsoo Hussong, Jeanette Fluid Dynamics Droplet impact on surfactant-laden thin liquid films is investigated experimentally with emphasis on vortex ring dynamics. Bottom- and side-view imaging reveal that increasing surfactant concentration progressively stabilize vortex rings, suppress azimuthal instabilities and promote concentric mixing patterns. A regime map is established in terms of film thickness, Reynolds number, and surface-tension ratio, yielding an empirical instability threshold. Shadowgraphy observations suggest that Marangoni stresses modify early capillary-wave dynamics, potentially altering vortex ring formation and delaying instability onset. These findings clarify the link between interfacial stresses, vortex ring dynamics, and mixing patterns in thin-film droplet impact. |
| title | Droplet impact on surfactant-laden thin liquid films: Vortex ring dynamics |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2602.14118 |