The turbulent flow between two rotating stirrers: similarity laws and transitions for the driving torques fluctuations

Olivier Cadot*, Olivier Le Maitre

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Instantaneous torques driving the turbulent flow between two rotating disks equipped with blades and enclosed in a fixed cylindrical cell are measured. The flow is studied by varying the rotational frequency of one stirrer while the other is set to a fixed rotational frequency. Many flow configurations, defined as the rotational frequency ratio S of the disks are studied from the co- to the counter-rotating regimes. For the entire range of S, the driving torques, means and fluctuations give a satisfactory match with similarity laws having no dependence on the Reynolds number. This allows the study to be restricted in the range S = [- 1 ; + 1]. In the detail, the counter-rotating regime seems to be insensitive to the Reynolds number in the range - 1.33 < S < - 0.69 that correspond to the well known two cell structure configuration. On the contrary, a significant dependence with the Reynolds number is found for the co-rotating regime. Flow transitions marked by strong torque fluctuation crisis are observed for both the co- and counter-rotating regimes. Mean flow visualization elucidates the flow topology corresponding to these transitions.

Original languageEnglish (US)
Pages (from-to)258-270
Number of pages13
JournalEuropean Journal of Mechanics, B/Fluids
Volume26
Issue number2
DOIs
StatePublished - Jan 1 2007

Keywords

  • Similarities
  • Transitions
  • Turbulent torque fluctuations

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)

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