Drag Reduction in Bubbly Taylor-Couette Turbulence

van den Berg, Thomas H.; Luther, Stefan; Lathrop, Daniel P.; Lohse, Detlef

doi:10.1103/PhysRevLett.94.044501

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Drag Reduction in Bubbly Taylor-Couette Turbulence

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Luther, Stefan
Research Group Biomedical Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

van den Berg, T. H., Luther, S., Lathrop, D. P., & Lohse, D. (2005). Drag Reduction in Bubbly Taylor-Couette Turbulence. Physical Review Letters, 94, 044501-1-044501-4. doi:10.1103/PhysRevLett.94.044501.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-15E5-3

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 = 7×10 4 and Re = 10 6 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 = 10 6. 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.