Electrowetting-on-dielectric induced bubble dynamics and surface waves

Run Yan, Chung Lung Chen

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

1 Scopus citations


This paper presents electrowetting-on-dielectric (EWOD) induced bubble dynamics (i.e., oscillation, escape, and detachment) along with surface waves. When voltage was applied to the electrowetting system, the contact angle declined as the absolute value of voltage increased. Bubble oscillation was demonstrated under sine, triangle, and square waves. A gradual change in contact angle was observed in the sine and triangle waves, whereas the square wave exhibited a relatively small and constant contact angle most of the time. Under the same applied peak voltage, the sine wave showed a weaker electrowetting effect, the triangle wave was moderate, and the square wave demonstrated a stronger effect. When the electrode wire was right above the bubble, the bubble oscillated at its initial position. When the electrode wire was placed on one side, electrowetting repelled the bubble from its initial position. The electrowetting effect on the lateral wall was studied when a sine wave with 70V peak voltage and 1Hz frequency was applied to the system. A surface wave generated via motion of the three-phase contact point was detected. Bubble detachment due to bubble oscillation and surface wave perturbation was captured by a high-speed camera. The study presented in this paper holds great significance for actively controlling bubble dynamics and improving the operating efficiency in fluid dynamic and heat transfer systems.

Original languageEnglish
Title of host publicationAIAA Aviation 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Number of pages11
ISBN (Print)9781624105890
StatePublished - 2019
EventAIAA Aviation 2019 Forum - Dallas, United States
Duration: 17 Jun 201921 Jun 2019

Publication series

NameAIAA Aviation 2019 Forum


ConferenceAIAA Aviation 2019 Forum
Country/TerritoryUnited States


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