Abstract: Based on Bloor & Ingham’s approach for determining the fluid field and on the analyses of loci offluid particles inside hydrocyclones, analytical models are developed for calculating the migration probability ofsingle-cone and two-cone hydrocyclones separating light dispersions. The calculated results are in good agreementwith Thew’s correlation at different flow rate, split ratio or fluid properties if the structural parameters keep thesame as those of Thew’s 35 mm hydrocyclone. The difference between predictions according to two-cone model andsingle-cone model is nearly negligible, which is very close to Thew’s original idea that major separation happensin the small cone-angle zone. Calculated results indicate that split ratio has little effects on reduced migrationprobability at least for F ≤ 20%, which is consistent to the conclusion drawn from Thew’s correlation that reducedmigration probability will remain constant when split ratio changes. Because no simplifying hypothesis is imposed onstructural parameters, the presented models can also be reliably applied in predicting the effects of those parameterson migration probability.

Key words: hydrocyclone, theoretical model, migration probability

摘要： Based on Bloor & Ingham’s approach for determining the fluid field and on the analyses of loci offluid particles inside hydrocyclones, analytical models are developed for calculating the migration probability ofsingle-cone and two-cone hydrocyclones separating light dispersions. The calculated results are in good agreementwith Thew’s correlation at different flow rate, split ratio or fluid properties if the structural parameters keep thesame as those of Thew’s 35 mm hydrocyclone. The difference between predictions according to two-cone model andsingle-cone model is nearly negligible, which is very close to Thew’s original idea that major separation happensin the small cone-angle zone. Calculated results indicate that split ratio has little effects on reduced migrationprobability at least for F ≤ 20%, which is consistent to the conclusion drawn from Thew’s correlation that reducedmigration probability will remain constant when split ratio changes. Because no simplifying hypothesis is imposed onstructural parameters, the presented models can also be reliably applied in predicting the effects of those parameterson migration probability.

关键词: hydrocyclone;theoretical model;migration probability