Quantifying microbubble clustering in turbulent flow from single-point measurements

E. Calzavarini, T.H. Berg, van den, F. Toschi, D. Lohse

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Abstract

Single-point hot-wire measurements in the bulk of a turbulent channel have been performed in order to detect and quantify the phenomenon of preferential bubble accumulation. We show that statistical analysis of the bubble-probe colliding-time series can give a robust method for investigation of clustering in the bulk regions of a turbulent flow where, due to the opacity of the flow, no imaging technique can be employed. We demonstrate that microbubbles (R0 ¿ 100 µm) in a developed turbulent flow, where the Kolmogorov-length scale is ¿ ¿ R0, display preferential concentration in small scale structures with a typical statistical signature ranging from the dissipative range, O(¿), up to the low inertial range O(100¿). A comparison to Eulerian–Lagrangian numerical simulations is also presented to further support our proposed way to characterize clustering from temporal time series at a fixed position.
Original languageEnglish
Article number040702
Pages (from-to)040702-1/6
Number of pages6
JournalPhysics of Fluids
Volume20
Issue number4
DOIs
Publication statusPublished - 2008

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