Turbulent bubbly flow (Articolo in rivista)

Type
Label
  • Turbulent bubbly flow (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Van den Berg T.H., Luther S., Mazzitelli I.M., Rensen J.M., Toschi F., Lohse D. (2006)
    Turbulent bubbly flow
    in Journal of turbulence
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Van den Berg T.H., Luther S., Mazzitelli I.M., Rensen J.M., Toschi F., Lohse D. (literal)
Pagina inizio
  • 1 (literal)
Pagina fine
  • 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 7 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Applied Physics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands Istituto per le Applicazioni del Calcolo, CNR, Viale del Policlinico 137, I-00161, Roma, Italy (literal)
Titolo
  • Turbulent bubbly flow (literal)
Abstract
  • The effect of bubbles on fully developed turbulent flow is investigated numerically and experimentally, summarizing the results of our previous papers (Mazzitelli et al., 2003, Physics of Fluids15, L5. and Journal of Fluid Mechanics488, 283; Rensen, J. et al. 2005, Journal of Fluid Mechanics538, 153). On the numerical side, we simulate Navier–Stokes turbulence with a Taylor–Reynolds number of Re?˜60, a large large-scale forcing, and periodic boundary conditions. The point-like bubbles follow their Lagrangian paths and act as point forces on the flow. As a consequence, the spectral slope is less steep as compared to the Kolmogorov case. The slope decrease is identified as a lift force effect. On the experimental side, we do hot-film anemometry in a turbulent water channel with Re? ˜ 200 in which we have injected small bubbles up to a volume percentage of 3%. Here the challenge is to disentangle the bubble spikes from the hot-film velocity signal. To achieve this goal, we have developed a pattern recognition scheme. Furthermore, we injected microbubbles up to a volume percentage of 0.3%. Both in the counter flowing situation with small bubbles and in the co-flow situation with microbubbles, we obtain a less spectral slope, in agreement with the numerical result. (literal)
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