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|Title:||EFFECT OF SEDIMENT CONCENTRATION ON FRICTION FACTOR IN PIPE FLOW|
|Authors:||Sant, Pratibha Shankar|
|Keywords:||CIVIL ENGINEERING;SEDIMENT EFFECT;FRICTION FACTOR;PIPE FLOW|
|Abstract:||Most of existing storm sewers are designed with insufficient knowledge of sediment transport and many of them, especially larger diameter sewers frequently present due to sediment deposition. Therefore, results of an experimental study on the effects of sedimentconcentration of suspended load on the resistance to flow or friction factor in a pipeline system are presented in this thesis. The experiments were carried out under different hydraulic conditions in 4.5m long and 0.0 17m, 0.02135m and 0.0254m diameter pipes. Clay and sand were used as suspended sediment which has been mixed with water for study. Analysis of these data has shown that the effect of presence of fine suspended sediment on flow resistance. For clear-water flow in pipes without suspended-load movement, the existing relationship between the flow friction factor, Reynolds number and relative roughness fit the theoretical relationship well. The presence of sediment concentration decreases the flow friction factor. For pipe flows with sediment in suspension, the friction factor is smaller for flows with suspended load movement than those without suspended load movement at the same Reynolds number. The decrease in friction factor in flows with suspended load movement is attributed to the damping of turbulence by suspended sediment. The decrease in the flow friction factor has been represented by the use of the relative flow friction factor, f, / f. Its value depends on the volumetric suspended -load concentration and the size of the particle. Relationships have been derived from the experimental data for determination of friction factor in case of clay as well as sand moving in suspension in terms of suspended load concentration. The experimental data fits well into the proposed relationship|
|Research Supervisor/ Guide:||Kothyari, U. C.|
|Appears in Collections:||MASTERS' DISSERTATIONS (Civil Engg)|
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