ABSTRACT:

The flow pattern of complex slurries depends on the contents of fine, especially colloidal particles. The paper describes experimental investigation of the complex hydro-mixtures focused on evaluation of the effect of particle size and concentration on slurry flow behavior in the laminar and turbulent regime. Sand slurries conveyed in water as well as in low and medium concentrated Kaolin slurries and fly and bottom ash slurries were experimentally investigated with respect to the solid phase concentration and composition and their flow behavior was evaluated.

INTRODUCTION

Horizontal transport from collector to storage tank or feeder of vertical transport line should play a significant role in the deep see mining technology. The raw slurry transported from collector to vertical hydraulic pipeline transport system will consist of poly-metallic noodles as well as from clay particles, which will be collected together with the nodules. The flow behavior of complex slurry in horizontal pipe is therefore important for the safe and economical design of the transport technology. However, most knowledge on dense slurry pipeline flow has been concerned with the slurries consisting of either coarse particles with settling tendencies or very fine particles creating homogeneous, often non-Newtonian slurry. The flow behavior of the slurry containing both coarser and very fine particles has not been hitherto sufficiently clarified. Flow behavior of complex slurry depends on particle size distribution (i.e. contents of fine, medium and coarse particles), density, shape, and concentration. It is strongly affected by the density and rheological properties of the carrier liquid, too. The behavior of the system is determined by a mutual effect of the attractive and repulsive forces between the solid particles. Presence of fine, especially colloidal solid particles in a Newtonian liquid evokes a complex rheological behavior of the slurry.

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