Conclusion
In this paper, we numerically investigated the particle
motions inside cyclone separators with a variety of the
height of inserted pipe (TYPE-A, B, C and D), and
estimated the influences on the performance for particle
separation. In this study, we adopted the numerical prediction
method combined with the large eddy simulation (LES)
based on a Smagorinsky model for the flow field and the
particle tracing with a Lagrangian method. As results of
our investigation, it was found that the spiral vortex can
be formed in the swirl chamber when the inserted height
of the outlet pipe is smaller (TYPE-A and B). The plane
vortex can be formed in upper region of the outlet port
due to the increase in the pressure resistance of outlet
pipe in case of larger inserted height of the outlet pipe
(TYPE-C and D). Moreover, it made clear that the
collection rates of about 90 % are achieved for particles
with a diameter of 5 μm in despite of the inserted height
of the outlet pipe and the particle behavior in the swirl
chamber was shown in detail.