9 Impact Comminution in Jet Mills
345
impact velocity before the impact. Thus, distributions of the relative particle impact
velocity, i.e. of the acting stress energies and stress frequencies in the process were
obtained. These experiments clearly confirmed the impression of the breakage modes
from SEM images of the glass spheres: A high number of impacts occurs during the
process in the mill, while at the same time, the mean relative particle impact velocity
is surprisingly low.
Finally, a product mass flow model of Köninger was presented. Based on an
adaption of the breakage model of Vogel and Peukert, and using the mean relative
particle impact velocity determined by the particle probes, this model provides a
reasonable approximation of the experimental data.
Acknowledgements We would like to thank the group of Prof. Weber from TU Clausthal for
the fruitful collaboration on classification within the priority program 1679. The support of the
Center of Functional Particle Systems is acknowledged as well. The German Research Foundation
is acknowledged for funding through the DFG priority program 1679 “Dynamic Simulation of
Interconnected Solids Processes”.
References
1. Skorych, V., Dosta, M., Hartge, E.-U., Heinrich, S.: Novel system for dynamic flowsheet
simulation of solids processes. Powder Technol. 314, 665–679 (2017)
2. Brosh, T., Kalman, H., Levy, A., Peyron, I., Ricard, F.: DEM–CFD simulation of particle
comminution in jet-mill. Powder Technol. 257, 104–112 (2014)
3. Wheeldon, M., Galk, J., Wirth, K.-E.: Investigation of the comminution process in pendular
roller mills. Int. J. Miner. Process. 136, 26–31 (2015)
4. Ata¸ s, S., Tekir, U., Paksoy, M.A., Çelik, A., Çam, M., Sevgel, T.: Numerical and experimental
analysis of pulverized coal mill classifier performance in the Soma B power plant. Fuel Process.
Technol. 126, 441–452 (2014)
5. Rajeswari, M.S.R., Azizli, K.A.M., Hashim, S.F.S., Abdullah, M.K., Mujeebu, M.A., Abdullah,
M.Z.: CFD simulation and experimental analysis of flow dynamics and grinding performance
of opposed fluidized bed air jet mill. Int. J. Miner. Process. 98, 94–105 (2011)
6. Toneva, P., Epple, P., Breuer, M., Peukert, W., Wirth, K.-E.: Grinding in an air classifier mill—
part I: characterisation of the one-phase flow. Powder Technol. 211, 19–27 (2011)
7. Weerasekara, N.S., Powell, M.S., Cleary, P.W., Tavares, L.M., Evertsson, M., Morrison, R.D.,
Quist, J., Carvalho, R.M.: The contribution of DEM to the science of comminution. Powder
Technol. 248, 3–24 (2013)
8. Toneva, P., Peukert, W.: A general approach for the characterization of fragmentation problems.
Adv. Powder Technol. 18, 39–51 (2007)
9. Berthiaux, H., Chiron, C., Dodds, J.: Modelling fine grinding in a fluidized bed opposed jet
mill. Powder Technol. 106, 88–97 (1999)
10. Gommeren, H.J.C., Heitzmann, D.A., Moolenaar, J.A.C., Scarlett, B.: Modelling and control
of a jet mill plant. Powder Technol. 108, 147–154 (2000)
11. Vogel, L., Peukert, W.: Modelling of grinding in an air classifier mill based on a fundamental
material function. KONA 21, 109–120 (2003)
12. Fuerstenau, D.W., Kapur, P.C., De, A.: Modeling breakage kinetics in various dry comminution
systems. KONA 21, 121–132 (2003)
13. Vogel, A.: The Alpine fluidised bed opposed jet mill: a case history. Powder Handling Process.
3, 129–132 (1991)
345
impact velocity before the impact. Thus, distributions of the relative particle impact
velocity, i.e. of the acting stress energies and stress frequencies in the process were
obtained. These experiments clearly confirmed the impression of the breakage modes
from SEM images of the glass spheres: A high number of impacts occurs during the
process in the mill, while at the same time, the mean relative particle impact velocity
is surprisingly low.
Finally, a product mass flow model of Köninger was presented. Based on an
adaption of the breakage model of Vogel and Peukert, and using the mean relative
particle impact velocity determined by the particle probes, this model provides a
reasonable approximation of the experimental data.
Acknowledgements We would like to thank the group of Prof. Weber from TU Clausthal for
the fruitful collaboration on classification within the priority program 1679. The support of the
Center of Functional Particle Systems is acknowledged as well. The German Research Foundation
is acknowledged for funding through the DFG priority program 1679 “Dynamic Simulation of
Interconnected Solids Processes”.
References
1. Skorych, V., Dosta, M., Hartge, E.-U., Heinrich, S.: Novel system for dynamic flowsheet
simulation of solids processes. Powder Technol. 314, 665–679 (2017)
2. Brosh, T., Kalman, H., Levy, A., Peyron, I., Ricard, F.: DEM–CFD simulation of particle
comminution in jet-mill. Powder Technol. 257, 104–112 (2014)
3. Wheeldon, M., Galk, J., Wirth, K.-E.: Investigation of the comminution process in pendular
roller mills. Int. J. Miner. Process. 136, 26–31 (2015)
4. Ata¸ s, S., Tekir, U., Paksoy, M.A., Çelik, A., Çam, M., Sevgel, T.: Numerical and experimental
analysis of pulverized coal mill classifier performance in the Soma B power plant. Fuel Process.
Technol. 126, 441–452 (2014)
5. Rajeswari, M.S.R., Azizli, K.A.M., Hashim, S.F.S., Abdullah, M.K., Mujeebu, M.A., Abdullah,
M.Z.: CFD simulation and experimental analysis of flow dynamics and grinding performance
of opposed fluidized bed air jet mill. Int. J. Miner. Process. 98, 94–105 (2011)
6. Toneva, P., Epple, P., Breuer, M., Peukert, W., Wirth, K.-E.: Grinding in an air classifier mill—
part I: characterisation of the one-phase flow. Powder Technol. 211, 19–27 (2011)
7. Weerasekara, N.S., Powell, M.S., Cleary, P.W., Tavares, L.M., Evertsson, M., Morrison, R.D.,
Quist, J., Carvalho, R.M.: The contribution of DEM to the science of comminution. Powder
Technol. 248, 3–24 (2013)
8. Toneva, P., Peukert, W.: A general approach for the characterization of fragmentation problems.
Adv. Powder Technol. 18, 39–51 (2007)
9. Berthiaux, H., Chiron, C., Dodds, J.: Modelling fine grinding in a fluidized bed opposed jet
mill. Powder Technol. 106, 88–97 (1999)
10. Gommeren, H.J.C., Heitzmann, D.A., Moolenaar, J.A.C., Scarlett, B.: Modelling and control
of a jet mill plant. Powder Technol. 108, 147–154 (2000)
11. Vogel, L., Peukert, W.: Modelling of grinding in an air classifier mill based on a fundamental
material function. KONA 21, 109–120 (2003)
12. Fuerstenau, D.W., Kapur, P.C., De, A.: Modeling breakage kinetics in various dry comminution
systems. KONA 21, 121–132 (2003)
13. Vogel, A.: The Alpine fluidised bed opposed jet mill: a case history. Powder Handling Process.
3, 129–132 (1991)