Elastic-plastic collision mechanism of micron-sized particle impacting rough surfaces

Abstract

The interaction between micron-sized particles and rough surfaces represents a common natural phenomenon. Diverse Gaussian rough surfaces are reconstructed by utilizing inverse Fourier transformation, and the impact of surface roughness on the collision of micron-sized particles is investigated, scrutinized through the sizes of RMS roughness and correlation length from 0.025 μm to 0.2 μm. Given the relevance of surface roughness to particle size, it focuses on 1 μm particles collision—a dimension representative size ingested in the turbine blade cooling passage. The results indicate that RMS roughness primarily influences the height of asperities, whereas correlation length predominantly affects the density of asperities. COR diminishes with increasing roughness, and does not exhibit a decline with escalating speed, when the correlation length is small. The maximum contact area remains relatively constant with the larger roughness. Rotational velocity and rebound angle are predominantly impacted by the RMS roughness, less influence of the correlation length.