Experiments in Fluids

, 41:343 | Cite as

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

Research Article

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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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Division of Energy and Environmental System, School of EngineeringHokkaido UniversitySapporoJapan
  2. 2.Fiber Amenity Engineering Course, School of EngineeringUniversity of FukuiFukuiJapan

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