The static shape of droplets under electrowetting actuation is well-understood. The steady-state shape of the droplet is obtained based on the balance of surface tension and electrowetting forces, and the change in apparent contact angle is well-characterized by the Young-Lippmann equation. However, the transient droplet shape behavior when a voltage is suddenly applied across a droplet has received less attention. Additional dynamic frictional forces are at play during this transient process. We present a model to predict this transient behavior of the droplet shape under electrowetting actuation. The droplet shape is modeled using the volume of fluid method. The electrowetting and dynamic frictional forces are included as an effective dynamic contact angle through a force balance at the contact line. The model is used to predict the transient behavior of water droplets on smooth hydrophobic surfaces under electrowetting actuation. The predictions of transient behavior of droplet shape and contact radius are in excellent agreement our experimental measurements. The internal fluid motion is explained and the droplet motion is shown to initiate from the contact line. An approximate mathematical model is also developed to understand the physics of the droplet motion and to describe the overall droplet motion and the contact line velocities.
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ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems
July 6–8, 2011
Portland, Oregon, USA
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
978-0-7918-4461-8
PROCEEDINGS PAPER
Dynamics of Droplet Motion Under Electrowetting Actuation Available to Purchase
S. Ravi Annapragada,
S. Ravi Annapragada
Purdue University, West Lafayette, IN
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Susmita Dash,
Susmita Dash
Purdue University, West Lafayette, IN
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Suresh V. Garimella,
Suresh V. Garimella
Purdue University, West Lafayette, IN
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Jayathi Y. Murthy
Jayathi Y. Murthy
Purdue University, West Lafayette, IN
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S. Ravi Annapragada
Purdue University, West Lafayette, IN
Susmita Dash
Purdue University, West Lafayette, IN
Suresh V. Garimella
Purdue University, West Lafayette, IN
Jayathi Y. Murthy
Purdue University, West Lafayette, IN
Paper No:
IPACK2011-52061, pp. 693-701; 9 pages
Published Online:
February 14, 2012
Citation
Annapragada, SR, Dash, S, Garimella, SV, & Murthy, JY. "Dynamics of Droplet Motion Under Electrowetting Actuation." Proceedings of the ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 1. Portland, Oregon, USA. July 6–8, 2011. pp. 693-701. ASME. https://doi.org/10.1115/IPACK2011-52061
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