Secondary erosion caused by particulate flow is a new research direction. On the basis of numerical analysis of the trajectory of particle motion in rotating gas flow, its equilibrium condition and causes of aggregation, a physical flow model of secondary erosion is suggested. By this model the mechanism of secondary erosion caused by particulate gas flow could be primarily explained. The vortex chamber experiment verifies the particle aggregation tendency in vortex flow and the experiment of particle deposition in bending tube proves in certain extent the correctness of the suggested model.

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