Stefan Pirker, Damir Kahrimanovic, Georg Aichinger,
"Modeling mass loading effects in industrial cyclones by a combined Eulerian-Lagrangian approach"
, in Acta Mechanica, Vol. 204, Nummer 2-3, 2009, ISSN: 0001-5970
Original Titel:
Modeling mass loading effects in industrial cyclones by a combined Eulerian-Lagrangian approach
Sprache des Titels:
Englisch
Original Kurzfassung:
Cyclone separation is studied by means of numerical simulations. While the gas flow is modeled
by a modified Reynolds stress (RS) model, the behavior of the particles is pictured by a combined Eulerian–
Lagrangian approach.Amono-disperse Eulerian particle phase is utilized to account for inter-particle collisions,
while the effects of fractional separation and particle-wall collisions are considered by poly-disperse Lagrangian
particles. The above particle models interact in two ways. On the one hand, the Lagrangian particles determine
the local mean diameter of the substitute Eulerian particle class. On the other hand, especially in regions of high
particle concentration, the Eulerian particle phase exerts an additional collisional force onto the Lagrangian
particle trajectories. An industrial cyclone is chosen as a test case and the numerical results are evaluated with
respect to pressure drop as well as to global and fractional separation efficiency. In this context the influence
of the cyclone’s mass loading and wall roughness is highlighted. Simulations indicate that the separation
efficiency improves with increasing mass loading until an excess loading is reached while at the same time
the pressure drop is reduced. Furthermore, it can be shown that rough walls lead to a reduction of separation
efficiency while simultaneously the pressure drop decreases. The simulations results are compared with both
an analytic theory of Muschelknautz [Die Berechnung von Zykonabscheidern für Gase. Chem Ing Techn 44,
(1+2):63–71, 1972] as well as with real plant measurements.