Settling Velocity of Spherical Particles in Calm Water

by Jean L. Boillat, Research Asst.; Lab. D'Hydraulique, Ecole Polytechnique Federal, CH-1015 Lausanne, Switzerland,
Walter H. Graf, (M.ASCE), Prof. and Dir.; Lab. D'Hydraulique, Ecole Polytechnique Federale, CH-1015 Lausanne, Switzerland,

Serial Information: Journal of the Hydraulics Division, 1981, Vol. 107, Issue 10, Pg. 1123-1131

Document Type: Journal Paper


The settling velocities of round and smooth spherical particles in calm water at 200 /LT R /LT 6,000 were analysed utilizing modern measuring techniques. When the present results are compared with the standard CTS = f(R) curve, they fall on the average 20 percent higher. However, the standard curve was established with the majority of data derived from fixed spheres tested in wind tunnels. Because the experiments are limited, a new drag coefficient cannot be made. To settle the existing discrepancy between fixed and falling spheres, it will be necessary to do further research, Possibly focusing on the effect of the Strouhal number on the drag of freely falling spheres.

Subject Headings: Particle velocity | Spheres | Fluid velocity | Settling velocity | Curvature | Drag (fluid dynamics) | Wind tunnel | Tunnels | Connecticut | United States

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