FM20_12440
XXI International Congress of Theoretical and Applied Mechanics
Warsaw, Poland, August 15-21, 2004

The Effect of Bubbles on Developed Turbulence

Stefan Luther, Thomas H. van den Berg, Judith Rensen, Detlef Lohse
University of Twente, Enschede, The Netherlands


We report on measurements of energy spectra, second and higher order structure functions in bubbly turbulence. The void fraction is up to 2.9 % with an mean equivalent bubble size of 3-5 mm. We find the results of [I. Mazzitelli, D. Lohse, F. Toschi, Phys. Fluids 15, L5 (2003)] qualitatively confirmed, i.e. a more pronounced energy enhancement on small scales than on large scales due to the presence of the bubbles, leading to a less steep slope in the spectrum as compared to the Kolmogorov -5/3 law.



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