A method based on the analogy of a particle motion relative to fluid in settling and transport condition was proposed for the correlation of the minimum transport velocity of settling slurries through horizontal pipes. The correlation was applied to uniform slurries with different density and the applicability was confirmed. Then the method was extended to include the multidispersed slurries with varying solid densities and sizes. This extension was based on a theory of settling for multidispersed slurries.
With experimentally determined settling velocity, density volume fraction of each group of nearly uniform particles, the minimum transport velocity of multidispersed slurries was calculated. Comparison with experimental values for multidispersed slurries with different sizes and densities showed good agreement.