Modeling on electrowetting-on-dielectric (EWOD)

Haolun Xu, Brian Hernan, Run Yan, Chung-Lung Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Electrowetting induced droplet, bubble dynamics as well as oscillation of interfacial wave have been studied numerically in this paper. The level set method has been used to track the interface of water and air. The capillary wave on the droplet and bubble interface could be seen during the electrowetting effect. The sudden variation of the bubble and droplet base creates a disturbance that propagates along the surface in the form of a capillary wave. As the wetted area is reduced during this transformation, the excess surface energy is converted into kinetic energy which stretches the droplet vertically and eventually leads to the detachment from the substrate; the results have been validated with available experimental data. The boundary between two immiscible fluids is susceptible to waves when disturbed with contact angle changes, as a result of exchange between the kinetic energy of the fluids and the potential energy either due to gravity or surface tension. This gives rise to the use of electrowetting to generate surface waves. The frequency relationship between voltage signal, contact angle and surface wave has been examined. The mechanism of the electrowetting induced surface wave have been explored to detach the bubbles.

Original languageEnglish
Title of host publication47th AIAA Fluid Dynamics Conference, 2017
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105005
DOIs
StatePublished - 1 Jan 2017
Event47th AIAA Fluid Dynamics Conference, 2017 - Denver, United States
Duration: 5 Jun 20179 Jun 2017

Publication series

Name47th AIAA Fluid Dynamics Conference, 2017

Conference

Conference47th AIAA Fluid Dynamics Conference, 2017
CountryUnited States
CityDenver
Period5/06/179/06/17

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