Forces Acting on Floc and Strength of Floc

by Tomonori Matsuo, Assoc. Prof. and Dr. Engrg.; Dept. of Urban Engrg. and Sanitary Engrg., Faculty of Engrg., The Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan,
Hideake Unno, Master of Engineering; Planning Div., Dept. of Water Supply and Environment, Ministry of Health and Welfare, Tokyo, Japan,

Serial Information: Journal of the Environmental Engineering Division, 1981, Vol. 107, Issue 3, Pg. 527-545

Document Type: Journal Paper


A theoretical and experimental investigation was attempted to determine floc strength quantitatively. Some formulas were presented to evaluate the hydrodynamical forces acting on a suspended floc particle, depending on the flow conditions and the particle Reynolds number values. The assumption of a pseudosurface tension allowed the calculation of a value for the inherent strengths of flocs.

Subject Headings: Particles | Ultimate strength | Reynolds number | Tension

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