non-spherical particle,ascending velocity,segregation,discrete element method
Clean Processing and Conversion of Energy Resources > 2. Dry Separation
Abstract Accepted
金鹏 乔 / 中国矿业大学
海深 江 / 中国矿业大学
晨龙 段 / 中国矿业大学
跃民 赵 / 中国矿业大学
In this work, the discrete element method was used to study the effects of vibrations and intruder shape on the dimensionless ascending velocity (va) of the intruder. The intruder was in prolate shape with aspect ratio varied but its equivalent diameter fixed. It was found that va increases and then decreases with the rise of the dimensionless vibration amplitude (Ad) and the dimensionless vibration frequency (fd), and va increases with the decrease of the sphericity of the intruder (Φ). va was also found to be linked to the orientation (α) of the intruder since the windward area (Ap) changes accordingly. Moreover, the porosity variation in the vibrated bed and the granular temperature were analyzed, which can be linked to the change of va. It was further found that va can be uniformly correlated to Ad‧f 0.5 d, while the critical change of the response of va to Ad and fd occurs at Γ=4.83, Γ is the vibration intensity. Based on these findings, a piecewise equation was proposed to predict va as a function of Ad, fd, and Φ.