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