Numerical study of the motion behaviour of three-dimensional cubic particle in a thin drum
The motion of three-dimensional cubic particles in a thin rotating drum is simulated by the SIPHPM method. The drums with frictional or smooth front and rear walls, and the particles of cubic and spherical shapes, and different particle numbers are considered to study the effect of cubic particle shape, end-wall frictions and filling levels. Different flow patterns of cubic particles are observed, which are significantly dominated by the friction from the end-walls. The probability density function of velocity components, the flatness factors are used to analyze the motion behaviour of cubic particle. The Froude number, ensemble mean and time averaged particle velocities are also analyzed. A primary and secondary mode of driving from the end-wall frictions are indicated and the mechanisms on the influences of wall friction, particle shape and filling levels are fully explained.
Based on the theory of elastic mechanics,an analytical solution was derived for a compress sample of triaxial compression test.According to the mechanical characteristics and the analytic solution of the compress sample,a method and a formula for calculating the Poisson ratio of grain were put forward.The experimental data of the triaxial compression test of rice was analyzed and verified according to related references,and the results showed that the method was feasible.