Turbulence-induced particle resonance before detachment from a flat surface

Particle resuspension is a common phenomenon in nature and industries but not fully understood yet. In this work, we report direct experimental evidence for turbulence-induced resonance of wall-adhered particles before detachment. The recorded frequency is one or two orders of magnitude lower than that normally predicted by the Rock n' Roll model. The frequency ratio ϕ, between the natural frequency of particle adhesion and wall turbulence frequency, is found to be the key parameter that determines the occurrence of turbulence-induced resonance. This work may shed light on the resonance-enhanced cleaning of very small particles.