Fingering Instability of Binary Droplets on Oil Pool
The interfacial instability of a complex fluid in a multiphase flow system is ubiquitous in both nature and industry. We experimentally investigated the spreading and interfacial instability dynamics of a binary droplet (a water and 2-propanol (IPA) mixture) on an immiscible (sunflower oil) pool. Fo...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/8/5/138 |
| _version_ | 1827741263990882304 |
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| author | Koji Hasegawa Yuya Kishimoto |
| author_facet | Koji Hasegawa Yuya Kishimoto |
| author_sort | Koji Hasegawa |
| collection | DOAJ |
| description | The interfacial instability of a complex fluid in a multiphase flow system is ubiquitous in both nature and industry. We experimentally investigated the spreading and interfacial instability dynamics of a binary droplet (a water and 2-propanol (IPA) mixture) on an immiscible (sunflower oil) pool. For droplets of 40 wt% IPA solution on sunflower oil, fingering instability occurred at the spreading liquid front. To reveal the interfacial characteristics of the spreading and fingering processes, we analyzed the interplay among the speed, diameter, and number of fingers on the spreading front. Based on our observations, the finger length, wavelength between the fingers, head length, and neck length were quantified. Our experimental results clearly demonstrate that fingering instability can be driven by the capillary effect for a liquid–liquid system as well as the Plateau–Rayleigh instability. We hope that our results will inspire further experimental and numerical investigations to provide deeper insights into the interfacial dynamics of multicomponent droplets in a liquid pool. |
| first_indexed | 2024-03-11T03:44:18Z |
| format | Article |
| id | doaj.art-0708fc4ae26e44ee9981246f34349b52 |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-11T03:44:18Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-0708fc4ae26e44ee9981246f34349b522023-11-18T01:20:11ZengMDPI AGFluids2311-55212023-04-018513810.3390/fluids8050138Fingering Instability of Binary Droplets on Oil PoolKoji Hasegawa0Yuya Kishimoto1Department of Mechanical Engineering, Kogakuin University, Tokyo 163-8677, JapanDepartment of Mechanical Engineering, Kogakuin University, Tokyo 163-8677, JapanThe interfacial instability of a complex fluid in a multiphase flow system is ubiquitous in both nature and industry. We experimentally investigated the spreading and interfacial instability dynamics of a binary droplet (a water and 2-propanol (IPA) mixture) on an immiscible (sunflower oil) pool. For droplets of 40 wt% IPA solution on sunflower oil, fingering instability occurred at the spreading liquid front. To reveal the interfacial characteristics of the spreading and fingering processes, we analyzed the interplay among the speed, diameter, and number of fingers on the spreading front. Based on our observations, the finger length, wavelength between the fingers, head length, and neck length were quantified. Our experimental results clearly demonstrate that fingering instability can be driven by the capillary effect for a liquid–liquid system as well as the Plateau–Rayleigh instability. We hope that our results will inspire further experimental and numerical investigations to provide deeper insights into the interfacial dynamics of multicomponent droplets in a liquid pool.https://www.mdpi.com/2311-5521/8/5/138fingering instabilitybinary dropletsdroplet spreading |
| spellingShingle | Koji Hasegawa Yuya Kishimoto Fingering Instability of Binary Droplets on Oil Pool Fluids fingering instability binary droplets droplet spreading |
| title | Fingering Instability of Binary Droplets on Oil Pool |
| title_full | Fingering Instability of Binary Droplets on Oil Pool |
| title_fullStr | Fingering Instability of Binary Droplets on Oil Pool |
| title_full_unstemmed | Fingering Instability of Binary Droplets on Oil Pool |
| title_short | Fingering Instability of Binary Droplets on Oil Pool |
| title_sort | fingering instability of binary droplets on oil pool |
| topic | fingering instability binary droplets droplet spreading |
| url | https://www.mdpi.com/2311-5521/8/5/138 |
| work_keys_str_mv | AT kojihasegawa fingeringinstabilityofbinarydropletsonoilpool AT yuyakishimoto fingeringinstabilityofbinarydropletsonoilpool |