2025 Volume 81 Issue 16 Article ID: 24-16041
In this study, numerical experiments on mixed-size sediment flows were performed by using a numerical simulation of three-dimensional coupled motions of solids and fluids to analyze the factors that have an effect on the vertical segregation associated with the flow. The segregation velocity of each particle size was defined as the difference from the mean velocity in the vertical direction and this index made it possible to consider the progress of segregation quantitatively. The coefficient of variation of particle-size, which is the ratio of the standard deviation of the particle size to the mean particle size, was also obtained as an indicator of the particle size distribution. The effects of the velocity gradient and particle size distribution on the segregation process were analyzed using these parameters. The analysis results show that the larger the coefficient of variation of the particle sizes, the more pronounced the segregation velocity as the velocity gradient increases.
