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Experimental investigation of three-dimensional flow around particles in a turbulent channel flow

Farzad Ahmadi1, Sean Sanders2, and Sina Ghaemi1,*

  • 1Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8
  • 2Department of Chemical and Material Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2V4

  • *Author to whom all correspondence should be addressed: ghaemi@ualberta.ca
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Phys. Rev. Fluids 5, 014302 – Published 7 January, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.014302

Abstract

The interaction between particles and turbulent flow is investigated by simultaneous measurement of the time-resolved three-dimensional (3D) velocity of particles and the carrier liquid phase. The investigation is conducted in a horizontal channel flow at a Reynolds number, Re, of 20 000, based on the average velocity and full channel height. The particle-laden suspension is produced by nearly neutrally buoyant beads with a density of 1.05g/cm3 and a mean diameter of 370 μm at a volumetric concentration of 0.1%. The liquid phase is seeded with 2 μm tracers, the images of which are digitally separated from the larger beads using a medina filter, and processed using time-resolved 3D particle tracking velocimetry. Conditional sampling of the beads and their surrounding fluid, based on the beads’ wall-normal motion, showed that ascending beads were mostly located within ejection motions of the fluid. However, the descending beads did not indicate any correlation with the streamwise fluid velocity; the beads were surrounded by wallward fluid motions with both positive and negative streamwise velocity fluctuations. For both ascending and descending beads, the surrounding fluid motion had a strong spanwise velocity component. Inspection of the 3D beads’ pathlines showed a spiral motion of beads around a streamwise axis. At y/h<0.2, the descending beads showed a stronger correlation with their surrounding fluid, while ascending beads demonstrated a stronger correlation with their surrounding flow farther away from the wall. Conditional sampling of the beads and their surrounding flow was also performed based on the streamwise acceleration of the beads. The results showed that, in the near-wall region of y/h<0.2, slip velocity and the resultant drag force were not in the same direction as the bead acceleration. Therefore, for this near-wall region, the drag force is not sufficient to model the dynamics of the large nearly buoyant beads.

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Phys. Rev. Fluids 5, 014302– Published 7 January, 2020
  • Received 17 June 2019
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