The Multi-Sized Slurry Flows in Horizontal Pipes : Innovated Models and Verification

Abstract

In designing pipeline systems for commercial slurries, it is essential to accurately determine the hydraulic gradient at transport velocities. It is crucial to note that the slurries are conveyed as a mixture of multi-sized solids and water. Although many researchers have proposed correlations for the prediction of hydraulic gradient, most have been developed for slurries with uniform sized particles of solids.By considering two different transport conditions of a mixed-sized slurry, innovated models were conventional method by Condolios-Chapus. Measurements of hydraulic gradient, solids concentration, and flow velocity in a 1-inch pipeline were made in this study. Predictions with the innovated models could be correlated with the data including

Slurry Pipeline Design of Multi-sized Solids:Application of Innovated Models

“…After selecting the pipe with inside diameter of 265.1 mm and arbitrarily selected wall thickness of 4.0 mm from the table, the calculation should be repeated as follows : It should be noted that, the values of pressure drop for the Consolidation Coal Pipeline have not yet been published. As a result, the hydraulic gradient based on the innovated models of mixed-sized slurry, which have been explained in detail elsewhere [2], was not estimated for the comparison in this study.…”

“…For slurries consisting of multi-sized solids, the innovated models developed by Seitshiro et al [2], are recommended for the evaluation of hydraulic gradient : coarse-fine and coarse-coarse slurry models. For transporting fine and coarse solids in pipes, the coarse-fine model can be applied by a series of the following equations : (3) with: (5) where i si and i s = contributed hydraulic gradient of each particle size d i , and for all coarse solids calculated by the settling slurry model [3], while i v is hydraulic gradient of modified form of vehicle.…”

“…In addition, it is valid to evaluate the effect of fine portion of solids on the hydraulic gradient of multi-sized slurry flows in pipelines. For these reasons, analytical models of slurry flow were developed by Seitshiro et al [2] and confirmed with experimental data. The analytical results, which allow scale-up, were verified with the wide range of data covering practical transport conditions.…”