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Simultaneous measurements of the fluid and the solid phases in homogeneous turbulence: preliminary results at Reλ = 250

  • Michele Guala
  • Alexander Liberzon
  • Klaus Hoyer
  • Arkady Tsinober
  • Wolfgang Kinzelbach
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 11)

Abstract

Two-phase turbulent flows are of great interest for a number of most important and extremely diverse application such as combustion, sedimentation, fluidized beds, settling and resuspension of organic material and contaminants in lakes, ocean, waste water management, evolution of clouds, rain formation and dust storms (see for example Crowe et al., 1998, Gyr and Kinzelbach, 2003, Burton & Eaton 2005 and references therein). In a turbulent flow the interaction between the second phase and the carrier fluid is important since, for example the nonlinear processes that redistribute energy between the scale of the energy containing eddies and the scales associated with the field of velocity derivatives, are two-way coupled with the spatial distribution of the second phase. In the case of dilute suspensions of solid particles, the small scale processes of turbulence were observed to be modified due to the effects such as inertial response of particles to fluid acceleration, gravitational effects and preferential concentration of particles (see e.g. Ferrante & Elghobashi, 2003). In particular, in the flow regions where the dispersed solid phase tends to accumulate (i.e., clusters), the two way coupling effects may be enhanced, leading to strong modification of the local processes of self-amplification of velocity derivatives (see e.g. Tsinober, 2001).

Keywords

Tracer Particle Settling Velocity Stokes Number Preferential Concentration Observation Volume 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2007

Authors and Affiliations

  • Michele Guala
    • 1
  • Alexander Liberzon
    • 1
    • 2
  • Klaus Hoyer
    • 1
  • Arkady Tsinober
    • 3
  • Wolfgang Kinzelbach
    • 1
  1. 1.Institute of Environmental Engineering, ETH HonggerbergZurichSwitzerland
  2. 2.Department of Fluid Mechanics and Heat TransferTel Aviv UniversityIsrael
  3. 3.Department of AeronauticsImperial CollegeLondonGreat Britain

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