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About possible mechanisms of influence of gas bubbles on characteristics of turbulent boundary layer

About possible mechanisms of influence of gas bubbles on characteristics of turbulent boundary layer Two different mechanisms responsible for the were revealed impact of gas bubbl injected into a boundary layer on the shear stress on the wetted surfaces. Both mechanisms exist due to extremely high sensitivity of bubbles even to very low pressure gradients and due to a high value of the virtual mass and coefficient of viscous drag for bubbles. The first mechanism manifests itself at the interaction of vortex structures with bubbles in the near-wall layer y+ < 250. The second mechanism is due to pressure gradient along the wetted surface. Ascertainment of these mechanisms explains the known discrepancies in the experimental results on gas saturation obtained on different experimental setups. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Thermophysics and Aeromechanics Springer Journals

About possible mechanisms of influence of gas bubbles on characteristics of turbulent boundary layer

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Publisher
Springer Journals
Copyright
Copyright © L.I. Maltsev, A.G. Malyuga, and B.G. Novikov 2006
ISSN
0869-8643
eISSN
1531-8699
DOI
10.1134/s0869864306030085
Publisher site
See Article on Publisher Site

Abstract

Two different mechanisms responsible for the were revealed impact of gas bubbl injected into a boundary layer on the shear stress on the wetted surfaces. Both mechanisms exist due to extremely high sensitivity of bubbles even to very low pressure gradients and due to a high value of the virtual mass and coefficient of viscous drag for bubbles. The first mechanism manifests itself at the interaction of vortex structures with bubbles in the near-wall layer y+ < 250. The second mechanism is due to pressure gradient along the wetted surface. Ascertainment of these mechanisms explains the known discrepancies in the experimental results on gas saturation obtained on different experimental setups.

Journal

Thermophysics and AeromechanicsSpringer Journals

Published: Sep 1, 2006

Keywords: Vortex; Turbulent Boundary Layer; Ring Vortex; Vortex Structure; Drag Reduction

References