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Turbulent drag reduction using fluid spheres

Published online by Cambridge University Press:  25 January 2013

J. J. J. Gillissen
J. J. J. Gillissen*
Affiliation:
Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
*
†Email address for correspondence: j.j.j.gillissen@tudelft.nl
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Abstract

Using direct numerical simulations of turbulent Couette flow, we predict drag reduction in suspensions of neutrally buoyant fluid spheres, of diameter larger than the Kolmogorov length scale. The velocity fluctuations are enhanced in the streamwise direction, and reduced in the cross-stream directions, which is similar to the more studied case of drag reduction using polymers. Despite these similarities, the drag reduction mechanism is found to originate in the logarithmic region, while the buffer region contributes to a slight drag increase, which is opposite to polymer-induced drag reduction. Another striking difference is the reduction of the turbulent energy at the large scales and an enhancement at the small scales.

JFM classification

Flow Control: Drag reduction Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Turbulent Flows: Turbulent boundary layers

Information

Type
Papers
Information
Journal of Fluid Mechanics , Volume 716 , 10 February 2013 , pp. 83 - 95
Copyright
©2013 Cambridge University Press

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