Operating points for pipelines carrying concentrated heterogeneous slurries

• Published in: Powder technology 2002-02, Vol.123 (1), p.19-24
• Main Authors: Wilson, K.C, Clift, R, Sellgren, A
• Format: Article
• Language: English
• Subjects: Applied sciences; Continuous conveyors: mechanical, hydraulic, pneumatic, etc; Exact sciences and technology; Flows in ducts, channels, nozzles, and conduits; Fluid dynamics; Fundamental areas of phenomenology (including applications); Material handling, hoisting. Storage. Packaging; Multiphase and particle-laden flows; Nonhomogeneous flows; Optimisation; Particle transport; Physics; Pressure gradient; Settling slurries; Vattenteknik; Water Resources Engineering
• ISSN: 0032-5910; 1873-328X; 1873-328X
• DOI: 10.1016/S0032-5910(01)00423-5

Early studies of slurry pipeline systems were based on moderate volumetric concentrations of solids (say up to 18%), for which the excess pressure gradient caused by solids is proportional to concentration. Much larger concentrations now coming into common use show more complicated behaviour. An algebraic analysis is developed to determine desirable operating points and associated energy consumption for settling slurries. This deals initially with the simple proportional behaviour, and then is extended to other cases. Comparison is made to recent experiments using highly concentrated settling slurries with various particle gradings. It is found that near-uniform gradings tend to have high frictional losses, while very broad gradings can give rise to energy-efficient transport at high concentrations.