A study on the effects of the gas outlet duct length and shape on
the flow field inside a small cyclone and its impacts on the cut off
diameter and pressure drop was performed. This study included
thirty-seven simulations with different outlet duct configurations.
All the simulations performed in this work are based on the LES
methodology, with the dynamic sub-grid turbulence model. The
dispersed phase, treated in a Lagrangian reference frame, was simulated
in a concomitant manner. Although expensive from the
computational point of view, the methodology adopted allowed
the gas–solid simulations to be independent of turbulence dispersion