2024/04/07 by Zhikai You, Yiyang Zhang, You, Zhikai +5
Engineering · Environmental Science · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Particle Dynamics in Fluid Flows #Wind and Air Flow Studies
paper · pdf · doi:10.48550/arxiv.2404.04882
openalex publication_date 2024/04/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Particle resuspension is a ubiquitous phenomenon with pivotal relevance in numerous natural and industrial contexts. In this study, we present findings on the resuspension of individual micro-sized particles, captured through high-speed camera experiments. Our observations reveal a universal behavior whereby a particle undergoes oscillatory motion due to turbulent excitation prior to its detachment from the surface. This motion is characterized by dimensionless number Ad and S. The frequency of particles oscillation is analyzed and it shows the frequency of particle oscillations increased with decreasing particle size. We establish a new model that the particle is a linear oscillator driven by stochastic torque from turbulence. It is shown that the stochastic oscillation is the key mechanism for particle detachment from a wall within a certain range of friction velocities.