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Experiments in Fluids

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01-08-2006 | Research Article

Turbulent shear stress profiles in a bubbly channel flow assessed by particle tracking velocimetry

Authors: Y. Murai, Y. Oishi, Y. Takeda, F. Yamamoto

Published in: Experiments in Fluids | Issue 2/2006

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Abstract

Particle tracking velocimetry (PTV) is applied to a bubbly two-phase turbulent flow in a horizontal channel at Re = 2 × 10⁴ to investigate the turbulent shear stress profile which had been altered by the presence of bubbles. Streamwise and vertical velocity components of liquid phase are obtained using a shallow focus imaging method under backlight photography. The size of bubbles injected through a porous plate in the channel ranged from 0.3 to 1.5 mm diameter, and the bubbles show a significant backward slip velocity relative to liquid flow. After bubbles and tracer particles are identified by binarizing the image, velocity of each phase and void fraction are profiled in a downstream region. The turbulent shear stress, which consists of three components in the bubbly two-phase flow, is computed by analysis of PTV data. The result shows that the fluctuation correlation between local void fraction and vertical liquid velocity provides a negative shear stress component which promotes frictional drag reduction in the bubbly two-phase layer. The paper also deals with the source of the negative shear stress considering bubble’s relative motion to liquid.

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Title: Turbulent shear stress profiles in a bubbly channel flow assessed by particle tracking velocimetry
Authors: Y. Murai
Y. Oishi
Y. Takeda
F. Yamamoto
Publication date: 01-08-2006
Publisher: Springer-Verlag
Published in: Experiments in Fluids / Issue 2/2006
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-006-0142-9

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