Drag reduction in bubbly Taylor-Couette turbulence

Th.H. van den Berg, S. Luther, Daniel P. Lathrop, Detlef Lohse

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Abstract

In Taylor-Couette flow the total energy dissipation rate and therefore the drag can be determined by measuring the torque on the system. We do so for Reynolds numbers between Re=7×104 and Re=106 after having injected (i) small bubbles (R=1  mm) up to a volume concentration of α=5% and (ii) buoyant particles (ρp/ρl=0.14) of comparable volume concentration. In case (i) we observe a crossover from little drag reduction at smaller Re to strong drag reduction up to 20% at Re=106. In case (ii) we observe at most little drag reduction throughout. Several theoretical models for bubbly drag reduction are discussed in view of our findings.
Original languageUndefined
Pages (from-to)044501-1-044501-4
Number of pages4
JournalPhysical review letters
Volume94
Issue number4
DOIs
Publication statusPublished - 2005

Keywords

  • METIS-227770
  • IR-54099

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