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Title: Anisotropic behaviours of droplets impacting on dielectrowetting substrates
Authors: Vo, Quoc
Fujita, Yuta
Tagawa, Yoshiyuki
Tran, Tuan
Keywords: Engineering::Mechanical engineering
Issue Date: 2020
Source: Vo, Q., Fujita, Y., Tagawa, Y. & Tran, T. (2020). Anisotropic behaviours of droplets impacting on dielectrowetting substrates. Soft Matter, 16, 2621-2628.
Project: 1523700102
Journal: Soft Matter
Abstract: The spreading of a sessile droplet on a solid substrate is enhanced if a non-uniform electric field is applied at the contact-line region. This so-called dielectrowetting effect holds great potential in controlling the spreading of droplets by varying the strength of the electric field. In this paper, we experimentally and theoretically study the effect of the dielectrowetting on the dynamics of droplets impacting on a solid surface having electrodes to impose the non-uniform electric field to the liquid. We experimentally study the anisotropic behaviours in both the spreading and retracting stages: the droplets spread more but retract with significantly smaller rates in the direction parallel to the electrodes. We provide a theoretical explanation for the spreading enhancement caused by dielectrowetting by decoupling it from inertia-induced spreading. We also theoretically account for the reduction in retraction rate using force balance at the contact line. The theoretical analysis in both the spreading and retracting stages is verified experimentally.
ISSN: 1744-683X
DOI: 10.1039/c9sm02322d
Rights: © 2020. The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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