Study on the Group Settling Velocity of Non-Viscous Solid Particle

Based on the view of relative movement, the group settlement was considered as a movement of current moving up in the suspended particle layer. The expressions of Reynolds number and drag coefficient were set up by the analysis of dimension and stress of dynamic equilibrium state. The theoretic formulae on group settlement of uniform sediment in the laminar region and turbulent region are proposed. It is verified by measured data, and shown that the calculated value by the theoretic formula and measured value agree with each other fairly well.