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dc.contributor.authorLim, An Engen_US
dc.contributor.authorLam, Yee Cheongen_US
dc.identifier.citationLim, A. E., & Lam, Y. C. (2020). Numerical investigation of nanostructure orientation on electroosmotic flow. Micromachines, 11(11), 971-. doi:10.3390/mi11110971en_US
dc.description.abstractElectroosmotic flow (EOF) is fluid flow induced by an applied electric field, which has been widely employed in various micro-/nanofluidic applications. Past investigations have revealed that the presence of nanostructures in microchannel reduces EOF. Hitherto, the angle-dependent behavior of nanoline structures on EOF has not yet been studied in detail and its understanding is lacking. Numerical analyses of the effect of nanoline orientation angle θ on EOF to reveal the associated mechanisms were conducted in this investigation. When θ increases from 5° to 90° (from parallel to perpendicular to the flow direction), the average EOF velocity decreases exponentially due to the increase in distortion of the applied electric field distribution at the structured surface, as a result of the increased apparent nanolines per unit microchannel length. With increasing nanoline width W, the decrease of average EOF velocity is fairly linear, attributed to the simultaneous narrowing of nanoline ridge (high local fluid velocity region). While increasing nanoline depth D results in a monotonic decrease of the average EOF velocity. This reduction stabilizes for aspect ratio D/W > 0.5 as the electric field distribution distortion within the nanoline trench remains nearly constant. This investigation reveals that the effects on EOF of nanolines, and by extrapolation for any nanostructures, may be directly attributed to their effects on the distortion of the applied electric field distribution within a microchannel.en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.rights© 2020 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleNumerical investigation of nanostructure orientation on electroosmotic flowen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsElectrokinetic Phenomenonen_US
dc.subject.keywordsElectroosmotic Flowen_US
dc.description.acknowledgementThe authors gratefully acknowledge Nanyang Technological University (NTU) for its financial support (Grant no. M4081926).en_US
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