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Experiments in Fluids

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01.03.2006 | Research Article

Turbulence statistics from optical whole-field measurements in particle-laden turbulence

verfasst von: C. Poelma, J. Westerweel, G. Ooms

Erschienen in: Experiments in Fluids | Ausgabe 3/2006

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Abstract

Obtaining turbulence statistics in particle-laden flows using optical whole-field measurements is complicated due to the inevitable data loss. The effects of this data loss are first studied using synthetic data and it is shown that the interpolation of missing data leads to biased results for the turbulence spectrum and its derived quantities. It is also shown that the use of overlapping interrogation regions in images with a low image density can lead to biased results due to oversampling. The slotting method is introduced for the processing of particle image velocimetry (PIV) data fields with missing data. Next to this, it is extended to handle unstructured data. Using experimental data obtained by a dual-camera PIV/PTV (particle tracking velocimetry) system in particle-laden grid turbulence, the performance of the new approach is studied. Some preliminary two-phase results are presented to indicate the significant improvement in the statistics, as well as to demonstrate the unique capabilities of the system.

Vorheriger Artikel Stereo particle image velocimetry applied to a vortex pipe flow

Nächster Artikel Experimental observations of the thermal flow around a square obstruction on a vertical wall in a differentially heated cavity

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Titel: Turbulence statistics from optical whole-field measurements in particle-laden turbulence
verfasst von: C. Poelma
J. Westerweel
G. Ooms
Publikationsdatum: 01.03.2006
Verlag: Springer-Verlag
Erschienen in: Experiments in Fluids / Ausgabe 3/2006
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-005-0072-y

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