Droplet ejection by electrowetting actuation
Fast contact-line motion of a droplet spreading on a solid substrate under the electrowetting effect generates strong capillary waves on the droplet's surface. The capillary waves may be strong enough to induce ejection of a satellite droplet from the primary one. In this study, we show that...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/153546 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Fast contact-line motion of a droplet spreading on a solid substrate under
the electrowetting effect generates strong capillary waves on the droplet's
surface. The capillary waves may be strong enough to induce ejection of a
satellite droplet from the primary one. In this study, we show that the size of
the satellite droplet and the ejection time are not only dependent on the
contact-line velocity, which directly relates to the applied voltage enabling
the electrowetting effect, but also affected by the ejection dynamics. We
derive a theoretical model of the criteria for droplet ejection and
experimentally verify the proposed criteria for wide ranges of viscosity,
droplet size and the applied voltage. |
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