In this work, the discrete element method was used to study the effects of vibrations and intruder shape on the dimensionless ascending velocity (v_a) of the intruder. The intruder was in prolate shape with aspect ratio varied but its equivalent diameter fixed. It was found that v_a increases and then decreases with the rise of the dimensionless vibration amplitude (A_d) and the dimensionless vibration frequency (f_d), and v_a increases with the decrease of the sphericity of the intruder (Φ). v_a was also found to be linked to the orientation (α) of the intruder since the windward area (A_p) changes accordingly. Moreover, the porosity variation in the vibrated bed and the granular temperature were analyzed, which can be linked to the change of v_a. It was further found that v_a can be uniformly correlated to A_d‧f 0.5 d, while the critical change of the response of v_a to A_d and f_d occurs at Γ=4.83, Γ is the vibration intensity. Based on these findings, a piecewise equation was proposed to predict v_a as a function of A_d, f_d, and Φ.

non-spherical particle,ascending velocity,segregation,discrete element method