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To understand how particles affect turbulent flow and particle distribution, experiments were conducted in a liquid-solid two-phase turbulent boundary layer using particle image velocimetry (PIV). Large-scale flow structures, such as streaks and hairpin vortices, were identified using techniques like proper orthogonal decomposition (POD) and Finite-Time Lyapunov Exponents (FTLE). The results showed that adding particles made the boundary layer thicker, reduced streamwise turbulence in certain regions, increased vertical turbulence near the wall, and decreased stress in the logarithmic layer. Further analysis revealed that particles increased the spacing of near-wall streaks, slowed down hairpin vortices, limited their upward movement, and compressed the overall size of vortex packets. This indicates that particles can influence turbulence by inhibiting the development of hairpin vortices.

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This page is a summary of: Experimental study on the interaction between particles and coherent structures in dilute liquid–solid two-phase turbulent boundary layer, AIP Advances, August 2024, American Institute of Physics,
DOI: 10.1063/5.0219466.
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