. From the experimental data of eight different samples of fly
ash, ESP dust, “white powder”, pulverised coal and cement, conveyed
over a wide range of pipe lengths (71 to 554 m) and diameters (52 to
105 mm I.D.), it was found that Fri,min≈5 predicts minimum transport
limits quite well (even under significant scale-up conditions) for
products which have “good” fluidised dense-phase characteristics.