An experimental and numerical study of turbulent swirling flow in gas cyclones

The cyclonic dryer: a numerical and experimental analysis of the influence of geometry on average particle residence time

“…Like numerous other studies (Hoekstra et al, 1999;Meier et al, 2000), this work presents tests of turbulence model fit. The turbulent k-ε model, modified k-ε models (RNG and Abujelala and Lilley (1984) model) and differential stress model were tested for the cyclonic chamber and cyclone momentum simulations.…”

“…There are some turbulence models, but none of them provide a good fit for every case. One can see that the flow field changes a lot by considering different models (Meier et al, 2000;Hoekstra et al, 1999). Because of this, here the fit of different turbulence models was tested.…”

Characterization of the Bidirectional Vortex Using Particle Image Velocimetry

“…Subsequently, the corresponding subvolumes are summed together to reconstruct the overall velocity profile of a given flow pattern. Hoekstra et al (1999) take an increasingly common approach of pairing a CFD solution with LDV measurements to validate their proposed turbulence models. Their experimental setup uses a back-scatter LDV to collect the axial and tangential velocity profiles in small volumes and these are then combined and correlated to provide an overall velocity profile.…”

Evaluation of Numerical Schemes for Dispersed Phase Modeling of Cyclone Separators

“…The CFD method has great potential to predict the fluid flow characteristics, particle trajectories and pressure drop in cyclone separators (Griffiths and Boysan, 1996). Initial research in simulation of cyclone separators based on two dimensional (Meier and Mori, 1999) and axisymmetric modeling assumptions (Boysan et al, 1982;Hoekstra et al, 1999) could not accurately resolve the complete flow physics inside cyclone separators due to the phenomenon of precessing vortex core (PVC), three dimensional nature of flow and secondary eddies and flows (Derksen, 2003). The numerical simulation quality depends largely on the type of turbulence modeling applied for approximation of turbulence present in the carrying gas (Griffiths and Boysan, 1996).The two equation k-є turbulence model and its variants are inadequate to simulate highly swirling turbulence flow in cyclone separators due to the assumption of isotropic turbulence structure in their formulation (Horvath et al, 2008).…”