Effect of concentration on settling velocity of sediment particles

• Main Author: Cheng, Nian-Sheng
• Other Authors: School of Civil and Environmental Engineering
• Format: Article
• Language: English
• Published: 2012
• Subjects: DRNTU::Engineering::Civil engineering::Water resources
• Online Access: https://hdl.handle.net/10356/94518; http://hdl.handle.net/10220/7649
• Institution: Nanyang Technological University

The drag coefficient for dispersed particles settling in a fluid is related to the particle Reynolds number with the same function as that used for a single particle falling in a clear fluid, after taking into account the effects of concentration both on the effective density of particles and on the viscosity of fluid-sediment mixture. A new method is developed for evaluating the settling velocity of natural sediment particles dispersed in a fluid; it agrees well with the available experimental data. The differences among various empirical expressions are illustrated using the present relationship.