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In this paper rheology and pressure loss measurements of fully developed silt flow in circular, axisymetric and horizontal conduits are presented. The silt samples studied have been taken at two different distances from the considered dam reservoir. It was found that for small values of silt concentrations, the silt behaves like a Newtonian fluid. Above a concentration limit, its behavior is like a Bingham one; a non-Newtonian behavior. The measured pressure losses indicated that the pressure loss of silt mixture flow increase with increasing mixture concentration. The comparison of pressure loss coefficients characteristics for the three different conduits show that the pressure loss coefficient is independent of the conduit diameter.

Rheology and pressure loss measurements of silt samples extracted from a dam reservoir