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dc.contributor.authorWu, Huixuan
dc.contributor.authorXu, Haitao
dc.contributor.authorBodenschatz, Eberhard
dc.identifier.citationRev. Sci. Instrum. 90, 115111 (2019);
dc.descriptionThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Rev. Sci. Instrum. 90, 115111 (2019) and may be found at
dc.description.abstractWe demonstrate a nonintrusive technique that is capable of measuring all three-components of vorticity following small tracer particles in the flow. The vorticity is measured by resolving the instantaneous spin of the microsized spherical hydrogel particles, in which small mirrors are encapsulated. The hydrogel particles have the same density and refractive index as the working fluid—water. The trajectory of the light reflected by the spinning mirror, recorded by a single camera, is sufficient to determine the 3D rotation of the hydrogel particle, and hence the vorticity vector of the flow at the position of the particle. Compared to more conventional methods that measure vorticity by resolving velocity gradients, this technique has much higher spatial resolution. We describe the principle of the measurement, the optical setup to eliminate the effect of particle translation, the calibration procedure, and the analysis of measurement uncertainty. We validate the technique by measurements in a Taylor-Couette flow. Our technique can be used to obtain the multipoint statistics of vorticity in turbulence.en_US
dc.publisherAmerican Institute of Physicsen_US
dc.rights© 2019 Author(s).en_US
dc.titleMeasuring vorticity vector from the spinning of micro-sized mirror-encapsulated spherical particles in the flowen_US
kusw.kuauthorWu, Huixuan
kusw.kudepartmentAerospace Engineeringen_US
kusw.oanotesPer Sherpa Romeo 02/23/2021:

Review of Scientific Instruments [Open panel below]Publication Information TitleReview of Scientific Instruments [English] ISSNs Print: 0034-6748 Electronic: 1089-7623 URL PublishersAmerican Institute of Physics [Society Publisher] [Open panel below]Publisher Policy Open Access pathways permitted by this journal's policy are listed below by article version. Click on a pathway for a more detailed view.

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12m Institutional Repository, Funder Designated Location, Preprint Repository, +1 Embargo12 Months Location Author's Homepage Funder Designated Location Institutional Repository Preprint Repository Conditions Must link to published version Publisher copyright and source must be acknowledged with set statement (see policy)
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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