(400v) Drag Coefficients of Irregularly Shaped Particles

The steady-state free-fall conditions of single non - spherical particle moving through Newtonian fluids have been studied experimentally. Measurements of the drag coefficients are reported in this paper for four different geometrical shapes, including cylinders，disks，cubes and cuboids with different sizes and materials were tested. From these measurements, a new empirical correlation considering the effect of particle size，shape，orientation，and the density was developed for predicting the drag coefficient of non—spherical particles．new correlation considering the effect of particle size，shape，orientation，and the density was developed for predicting the drag coefficient of non—spherical particles. This correlation has been formulated in terms of the Reynolds number based on the particle nominal diameter, particle polygonality and aspect ratio. The predictions have been tested against both the experimental data for CD collected in this study and the ones reported in previous works for cylinders，disks，cubes and cuboids and other shapes. A good agreement has been observed for the regularly shaped particles as well as for the regularly shape particle.