Experimental Investigation in Drag Coefficient of Cubes

Focused on the needs of an accurate drag model for non-spherical particles, a free settling experiment was performed in this paper using the uniformed cube and spliced cube. The drag coefficient of the cube with typical orientation angles at different Reynolds numbers is obtained. The results show that the drag coefficient of the cube is always higher than that of the sphere in the same Reynolds number (Re), especially in the range of Re > 2.58 × 102. The orientation angle has different effects on the drag coefficient of the cube in different Reynolds number ranges. The drag coefficient of the cube is in direct proportion to its orientation angle in the range of 10 < Re < 103. Then, a new correlation for the drag coefficient of the cube is brought forward. The drag correlation model shows a good agreement with the experimental data as well as the data reported in previous studies.