Bubbly Turbulent Drag Reduction is a Boundary Layer Effect

Th.H. van den Berg, Dennis Paulus Maria van Gils, Daniel P. Lathrop, Detlef Lohse

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In turbulent Taylor-Couette flow, the injection of bubbles reduces the overall drag. On the other hand, rough walls enhance the overall drag. In this work, we inject bubbles into turbulent Taylor-Couette flow with rough walls (with a Reynolds number up to 4×105), finding an enhancement of the dimensionless drag as compared to the case without bubbles. The dimensional drag is unchanged. As in the rough-wall case no smooth boundary layers can develop, the results demonstrate that bubbly drag reduction is a pure boundary layer effect
Original languageUndefined
Pages (from-to)084501-1-084501-4
Number of pages4
JournalPhysical review letters
Issue number8
Publication statusPublished - 2007


  • IR-59106
  • METIS-238529

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