Modeling of Cross Flow Classifier with Water Injection
In hydrocyclones, the particle separation efficiency is
limited by the suspended fine particles, which are discharged with the
coarse product in the underflow. It is well known that injecting water
in the conical part of the cyclone reduces the fine particle fraction in
the underflow. This paper presents a mathematical model that
simulates the water injection in the conical component. The model
accounts for the fluid flow and the particle motion. Particle
interaction, due to hindered settling caused by increased density and
viscosity of the suspension, and fine particle entrainment by settling
coarse particles are included in the model. Water injection in the
conical part of the hydrocyclone is performed to reduce fine particle
discharge in the underflow. The model demonstrates the impact of
the injection rate, injection velocity, and injection location on the
shape of the partition curve. The simulations are compared with
experimental data of a 50-mm cyclone.
[1] Dueck, J., Neesse, Th., Minkov, L., Kilimnik, D., Hararah, M., 2004.
Theoretical and experimental investigation of disturbed settling in a
polydisperse suspension. In: Matsumoto, Y., (Eds.), Proceedings of
ICMF-2004. Fifth International Conference on Multiphase Flow, 30
May-4 June, Yokohama (Japan), Paper No. 106, pp. 1-8.
[2] Dueck, J.G., Yu, D., Kilimnik, L.L., Min-kov., Neesse, Th., 2003.
Measurement of the sedimentation velocity of finely divided particles in a
tray centrifuge. Journal of Engineering Physics and Thermophysics 76
(4), 748-759.
[3] Dueck, J.G., Minkov, L.L., Pikushchak, E.V., 2006. On separation curves
of a throughput classification apparatus of finite length. Journal of
Engineering Physics and Thermophysics 79 (4), 171-178.
[4] Dueck, J., Minkov, L., Pikutchak, E., 2007. Modeling of the ÔÇÿÔÇÿFish-
Hook"-Effect in a classifier. Journal of Engineering Physics and
Thermophysics 80 (1), 64-73.
[5] Heiskanen, K., 1993. Particle Classification. Chapman and Hall,
London-Glasgow-New York-Tokyo-Melbourne-Madras. p. 321.
[6] R.Q., Ozsever, A.V., Singh, N., Parekh, B.K., 2001. Apex water Injection
for improved hydrocyclone classification efficiency. Mineral Engineering
14 (11), 1445-1457.
[7] Kelsall, D.F., Holmes, J.A., 1990. Improvement in classification
efficiency in hydraulic cyclones by water injection. In: Proceedings of the
5th Mineral processing Congress, Paper 9, Institute Of Mining and
Metallurgy, pp. 159-170.
[8] Minkov, L., Dueck, J., 2005. Collective effects by settling of polydisperse
dense suspension. Eurasian Physical-Technical Journal 12 (1(3)), 47-63.
[9] Neesse, Th., Schubert, H., Graichen, K., 1991. Practical and theoretical
aspects of dense-flow classification. Aufbereitungstechnik 32 (9), 459-
472.
[10]Schubert, H., Neeße, Th., 1980. A hydrocyclone separation model in
consideration of the multi-phase flow. In: Preprints International
Conference of Hydrocyclones, Cambridge, BHRA Fluid Engineering,
Paper No. 3, pp. 23-36.
[11]Udaya Bhaskar, K., Govindarajan, B., Barnawal, J.P., Rao, K.K., Gupta,
B.K., Rao, T.C., Classification studies of lead-zinc ore fines using waterinjection
cyclone. International Journal of Mineral Processing 77, 2005,
80-94.
[1] Dueck, J., Neesse, Th., Minkov, L., Kilimnik, D., Hararah, M., 2004.
Theoretical and experimental investigation of disturbed settling in a
polydisperse suspension. In: Matsumoto, Y., (Eds.), Proceedings of
ICMF-2004. Fifth International Conference on Multiphase Flow, 30
May-4 June, Yokohama (Japan), Paper No. 106, pp. 1-8.
[2] Dueck, J.G., Yu, D., Kilimnik, L.L., Min-kov., Neesse, Th., 2003.
Measurement of the sedimentation velocity of finely divided particles in a
tray centrifuge. Journal of Engineering Physics and Thermophysics 76
(4), 748-759.
[3] Dueck, J.G., Minkov, L.L., Pikushchak, E.V., 2006. On separation curves
of a throughput classification apparatus of finite length. Journal of
Engineering Physics and Thermophysics 79 (4), 171-178.
[4] Dueck, J., Minkov, L., Pikutchak, E., 2007. Modeling of the ÔÇÿÔÇÿFish-
Hook"-Effect in a classifier. Journal of Engineering Physics and
Thermophysics 80 (1), 64-73.
[5] Heiskanen, K., 1993. Particle Classification. Chapman and Hall,
London-Glasgow-New York-Tokyo-Melbourne-Madras. p. 321.
[6] R.Q., Ozsever, A.V., Singh, N., Parekh, B.K., 2001. Apex water Injection
for improved hydrocyclone classification efficiency. Mineral Engineering
14 (11), 1445-1457.
[7] Kelsall, D.F., Holmes, J.A., 1990. Improvement in classification
efficiency in hydraulic cyclones by water injection. In: Proceedings of the
5th Mineral processing Congress, Paper 9, Institute Of Mining and
Metallurgy, pp. 159-170.
[8] Minkov, L., Dueck, J., 2005. Collective effects by settling of polydisperse
dense suspension. Eurasian Physical-Technical Journal 12 (1(3)), 47-63.
[9] Neesse, Th., Schubert, H., Graichen, K., 1991. Practical and theoretical
aspects of dense-flow classification. Aufbereitungstechnik 32 (9), 459-
472.
[10]Schubert, H., Neeße, Th., 1980. A hydrocyclone separation model in
consideration of the multi-phase flow. In: Preprints International
Conference of Hydrocyclones, Cambridge, BHRA Fluid Engineering,
Paper No. 3, pp. 23-36.
[11]Udaya Bhaskar, K., Govindarajan, B., Barnawal, J.P., Rao, K.K., Gupta,
B.K., Rao, T.C., Classification studies of lead-zinc ore fines using waterinjection
cyclone. International Journal of Mineral Processing 77, 2005,
80-94.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:56883", author = "E. Pikushchak and J. Dueck and L. Minkov", title = "Modeling of Cross Flow Classifier with Water Injection", abstract = "In hydrocyclones, the particle separation efficiency is
limited by the suspended fine particles, which are discharged with the
coarse product in the underflow. It is well known that injecting water
in the conical part of the cyclone reduces the fine particle fraction in
the underflow. This paper presents a mathematical model that
simulates the water injection in the conical component. The model
accounts for the fluid flow and the particle motion. Particle
interaction, due to hindered settling caused by increased density and
viscosity of the suspension, and fine particle entrainment by settling
coarse particles are included in the model. Water injection in the
conical part of the hydrocyclone is performed to reduce fine particle
discharge in the underflow. The model demonstrates the impact of
the injection rate, injection velocity, and injection location on the
shape of the partition curve. The simulations are compared with
experimental data of a 50-mm cyclone.", keywords = "Classification, fine particle processing, hydrocyclone, water injection.", volume = "5", number = "6", pages = "1061-3", }