Resistance of Sewage Sludge to Flow in Pipes

by Tsung-Lien Chou,

Serial Information: Journal of the Sanitary Engineering Division, 1958, Vol. 84, Issue 5, Pg. 1-19

Document Type: Journal Paper


Due to heterogeneity and variability of material itself and complicated flow phenomena, the flow of sewage sludge in pipes defies direct application of existing hydraulic formulas for computing head loss. In this paper a new approach is proposed. First the flow is classified according to moisture content into two main types. With further subdivision of each type into laminar and turbulent stages, there are four categories of flow to be treated separately. For each, criteria are discussed and formulas are developed for practical application. Secondly by taking the moisture content and the origin of sludges as parameters a graphical method of statistical nature is suggested to determine the three physical properties of sewage sludge. With such empirical curves and rational formulas, it is believed a designer can predict the head loss of sewage sludge flowing in pipes under any conditions.

Subject Headings: Flow resistance | Load and resistance factor design | Sewage | Sludge | Pipe flow | Pipes | Pipe materials | Head loss (fluid mechanics)

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