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Abstract
The effect of varying fine percentage in the carrier fluid in the slurry was studied regards the flow variables; hydraulic gradient, delivered solids concentration and settling velocity, these variables were investigated in both horizontal and inclined pipes, also two solid mixtures were examined; the first has the same fine and coarse materials (phosphate), while the other, Talc was used as fine material and Sand as coarse material.Inclination of pipelines results in increasing the hydraulic gradient for all fine percentages examined, where as increasing the fine percentage in the solid mixture was found to decrease the total delivered solids concentrations.The settling velocity was influenced by varying fine percentage and by varying the inclination angle.The two-layer model proposed by Gillies et al (1991) was used in predicting the hydraulic gradient and the delivered solids concentration in horizontal and inclined pipes, good agreement was found for the horizontal pipes.Finally the use of the venturi meter as flow measurement device in slurry pipelines was examined.