Simultaneous measurement of fluid and dispersed phases in a particle-laden turbulent channel flow with the aid of 3-D PTV
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Three-dimensional high-definition particle tracking velocimetry is successfully applied to simultaneous measurement of fluid and dispersed phases in a vertical turbulent water channel flow. Turbulence statistics are substantially modified by the solid particles having a diameter of twice the Kolmogorov length scale. The streamwise turbulence intensity of the fluid phase is significantly increased in the channel, whilst it is unchanged at y+ < 20. In contrast, the wall-normal and spanwise components are increased in the whole cross-section. In the center of the channel, the wake behind a solid particle has almost the same streamwise length as that around a sphere in the uniform flow, and particles tend to align in the streamwise direction as they flow downstream. The quadrant analysis shows that the solid particles are densely distributed along the low-speed streaks, especially beneath the ejection event. The difference in traceability of particles to the ejection and sweep events should contribute to the particle agglomeration.