Particle-Laden Turbulent Flow Measurement with the Aid of 3-D High-Definition PTV.

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  • 高精細三次元粒子追跡流速計を用いた混相乱流計測
  • コウセイサイ 3ジゲン リュウシ ツイセキ リュウソクケイ オ モチイタ コンソウ ランリュウ ケイソク

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Abstract

Three-dimensional high-definition particle tracking velocimetry (3-D HDPTV) is successfully applied to simultaneous measurement of fluid and dispersed phase in a vertical turbulent water channel flow. On average, 400 and 200 velocity vectors are simultaneously obtained for tracer and solid particles, respectively. Turbulent statistics are substantially modified by the solid particles having a diameter of 2-3 times the Kolmogorov length scale. When the turbulent intensities are nondimensionalized with the wall friction velocity, the streamwise component of the fluid phase is significantly increased at the center of the channel, whilst it is unchanged at y+<20. Since the turbulent production due to shear is unchanged by the presence of the dispersed phase, the turbulence energy should be directly generated by the wake of solid particles. 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.

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