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dc.contributor.authorSader, John E.
dc.contributor.authorBurg, Thomas P.
dc.contributor.authorManalis, Scott R.
dc.date.accessioned2011-05-20T13:50:47Z
dc.date.available2011-05-20T13:50:47Z
dc.date.issued2010-03
dc.date.submitted2009-11
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.urihttp://hdl.handle.net/1721.1/62854
dc.description.abstractThe fluid–structure interaction of resonating microcantilevers immersed in fluid has been widely studied and is a cornerstone in nanomechanical sensor development. In many applications, fluid damping imposes severe limitations by strongly degrading the signal-to-noise ratio of measurements. Recently, Burg et al. (Nature, vol. 446, 2007, pp. 1066–1069) proposed an alternative type of microcantilever device whereby a microfluidic channel was embedded inside the cantilever with vacuum outside. Remarkably, it was observed that energy dissipation in these systems was almost identical when air or liquid was passed through the channel and was 4 orders of magnitude lower than that in conventional microcantilever systems. Here, we study the fluid dynamics of these devices and present a rigorous theoretical model corroborated by experimental measurements to explain these observations. In so doing, we elucidate the dominant physical mechanisms giving rise to the unique features of these devices. Significantly, it is found that energy dissipation is not a monotonic function of fluid viscosity, but exhibits oscillatory behaviour, as fluid viscosity is increased/decreased. In the regime of low viscosity, inertia dominates the fluid motion inside the cantilever, resulting in thin viscous boundary layers – this leads to an increase in energy dissipation with increasing viscosity. In the high-viscosity regime, the boundary layers on all surfaces merge, leading to a decrease in dissipation with increasing viscosity. Effects of fluid compressibility also become significant in this latter regime and lead to rich flow behaviour. A direct consequence of these findings is that miniaturization does not necessarily result in degradation in the quality factor, which may indeed be enhanced. This highly desirable feature is unprecedented in current nanomechanical devices and permits direct miniaturization to enhance sensitivity to environmental changes, such as mass variations, in liquid.en_US
dc.language.isoen_US
dc.publisherCambridge University Pressen_US
dc.relation.isversionofhttp://dx.doi.org/10.1017/S0022112009993521en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceMIT web domainen_US
dc.titleEnergy dissipation in microfluidic beam resonatorsen_US
dc.typeArticleen_US
dc.identifier.citationSADER, JOHN E., THOMAS P. BURG, and SCOTT R. MANALIS. “Energy Dissipation in Microfluidic Beam Resonators.” Journal of Fluid Mechanics 650 (2010) : 215-250. © 2010 Cambridge University Pressen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Biological Engineeringen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineeringen_US
dc.contributor.approverManalis, Scott R.
dc.contributor.mitauthorBurg, Thomas P.
dc.contributor.mitauthorManalis, Scott R.
dc.relation.journalJournal of Fluid Mechanicsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsSADER, JOHN E.; BURG, THOMAS P.; MANALIS, SCOTT R.en
dc.identifier.orcidhttps://orcid.org/0000-0001-5223-9433
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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