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signature=27fe40dfd620feec0260ffd4e7d59216,APS -2006 59th Annual Meeting of the APS Division of Flui...

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2023-12-01

2006 59th Annual Meeting of the APS Division of Fluid Dynamics

Sunday–Tuesday, November 19–21, 2006;

Tampa Bay, Florida

Session GE: Multiphase and Particle-Laden Flows III

10:30 AM–12:40 PM,

Monday, November 20, 2006

Tampa Marriott Waterside Hotel and Marina

Room: Florida Salon 123

Chair: Gretar Tryggvason, Worcester Polytechnic Institute

Abstract ID: BAPS.2006.DFD.GE.3

Abstract: GE.00003 : Microbubble clustering in turbulent flow

10:56 AM–11:09 AM

Authors:

Enrico Calzavarini

Thomas H. van den Berg

(University of Twente (The Netherlands))

Stefan Luther

(CORNELL , (USA))

Federico Toschi

(IAC - CNR and INFN (Italy))

Detlef Lohse

(University of Twente (The Netherlands))

Single-point hot-wire measurements in the bulk of a turbulent

channel have been performed in order to detect and quantify the

phenomenon of bubble preferential accumulation. We show that

statistical analysis of the bubble-probe colliding-times 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

micro-bubbles ($R_0 \simeq100\ \mu m$) in a developed turbulent

flow, where the Kolmogorov length-scale is $\eta \simeq R_0$, display

preferential concentration in small scale structures.

In particular, it is found that the clustering process is

enhanced by increasing the turbulence intensity.

A comparison with Eulerian-Lagrangian numerical simulations has

also been performed and arising similarities and differences will

be discussed.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.DFD.GE.3

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