| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 98 === This thesis investigates the flow behaviour of non-spherical particles in vibrating beds, studies the influence of vibration conditions on the flow behaviours and compares the flow behaviour between spherical and non-spherical particles. At the preliminary tests, paired POM particles (one of the non-spherical particles), made by gluing two single POM beads, were studied. The improved Particle Tracking Velocimetry (PTV) was employed to measure the translational and rotational velocities of these non-spherical particles in a vibrating bed. The transport properties of the paired POM particles in a vibrated bed, such as local average velocities, local fluctuation velocities, granular temperatures, fluctuation velocity distributions, self-diffusion coefficients and dimensionless convection flow rates, were evaluated from the experimental results and discussed. The study has shown that the improved PTV technique has the ability to measure more accurately the velocity field of non-spherical particulate systems and that the particle rotation can play a significant role in a vibrated granular bed.
The dimensionless convection flow rates and global granular temperatures in the non-spherical granular vibrated bed increase with the increase of the vibration acceleration and velocity. The dimensionless convection flow rates also increase with increasing the global granular temperatures. The dimensionless convection flow rates and global granular temperatures in a spherical granular system are larger than those in a non-spherical granular system since the POM paired particles studied here induce a particle inter-locking than spherical particles.
|
|---|
