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dc.contributor.authorVo, Quocen_US
dc.contributor.authorFujita, Yutaen_US
dc.contributor.authorTagawa, Yoshiyukien_US
dc.contributor.authorTran, Tuanen_US
dc.identifier.citationVo, Q., Fujita, Y., Tagawa, Y. & Tran, T. (2020). Anisotropic behaviours of droplets impacting on dielectrowetting substrates. Soft Matter, 16, 2621-2628.
dc.description.abstractThe 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.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.relation.ispartofSoft Matteren_US
dc.rights© 2020. The Royal Society of Chemistry. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleAnisotropic behaviours of droplets impacting on dielectrowetting substratesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.subject.keywordsAnisotropic Behavioursen_US
dc.subject.keywordsContact Line Regionsen_US
dc.description.acknowledgementThis study is supported by Nanyang Technological University and the Agency for Science, Technology and Research (A*STAR), Singapore, under its Pharos Funding Scheme (Grant No. 1523700102). We also acknowledge support from JSPS KAKENHI (Grant No. 17H01246). We thank Dr Phu Tran from Air Traffic Management Research Institute (ATMRI, NTU) for the fruitful discussions relating to applying the gradient descent algorithm in our paper.en_US
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