Research Article
Feb 1970
Clogging of Porous Column of Spheres by Sediment
Publication: Journal of the Hydraulics Division
Volume 96, Issue 2
Abstract
When a sediment suspension moves downward at a constant laminar flow through a vertical porous column packed regularly with uniform spheres and having critical pores which permit passage of spheres smaller than 1/7-diam. of the matrix grain, sediment deposition takes place by a characteristic mechanism known as bridging. The critical parameter which controls the clogging of the matrix is the ratio of the pore size of the matrix to the sediment size. Sediment with diameters equal to or greater than half the critical pore diameter of the matrix will deposit and, in time, totally clog the matrix preventing further motion of sediment particles through the matrix. Sediment with diameters less than half the critical pore diameter will deposit only in the dead space of the matrix by the straining mechanism. Considering sediment deposition in a vertical porous column as a stochastic process of pure birth, the time and space variation of sediment accumulation in the column is described by a second-order partial differential equation which has a closed solution. The hydraulic resistance of a clogging matrix is represented by an equation similar to Kozeny-Carman equation for head loss in flow through porous media and was verified experimentally.
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Published In
Journal of the Hydraulics Division
Volume 96 • Issue 2 • February 1970
Pages: 461 - 472
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Feb 1970
Published online: Feb 3, 2021
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Authors
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Ramaswamy Sakthivadivel, AM.ASCE
Asst. Res. Engr., Inst. of Engrg. Res., Univ. of California, Berkeley, CA; presently, Asst. Prof. of Hydr. Engrg., Coll. of Engrg, Madras, India
H. A. Einstein, M.ASCE
Prof. of Hydr. Engrg., Univ. of California, Berkeley, C. A
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.