Flow pattern and agglomeration in the dust outlet of a gas cyclone investigated by Phase Doppler Anemometry

Two‐way coupled large‐eddy simulations of the gas‐solid flow in cyclone separators

“…Obermair et al17 directly measured the effects of solids on (swirl) velocity profiles in the lower parts of a cyclone separator. We have simulated their experimental configuration in order to further validate our numerical procedure, specifically the representation of the effects the particles have on the gas‐flow.…”

“…We start with a brief recapitulation of the essentials of the numerical procedure, and of the modeling assumptions we make. We then discuss the cases studied experimentally by Obermair et al17, 18 that we use for validation purposes. In the main part of the article we introduce and then describe the results of the Stairmand cyclone simulations.…”

“…In order to check if the particle‐to‐gas coupling as implemented in our modeling strategy does predict qualitatively and quantitatively the right trends, we turned to the experimental work due to Obermair and coworkers 17, 18. Their experiments are very important for a number of reasons, specifically since they provide experimental gas swirl profiles with and without dust particles.…”

“…Gas‐flow patterns in various geometries as measured with laser Doppler anemometry (LDA) were presented in Obermair et al18 The emphasis in the experiments was on the lower parts of the cyclones, including the dust bin. Our main interest was in their geometry C, as in a subsequent article17 in this geometry swirl profiles in the presence of dust were presented. Results of the gas‐only flow large‐eddy simulations at Re = 3.4·10 5 (based on D = 0.4 m as defined in Figure 1, and U in = 12.7 m/s corresponding to an air flow rate of 800 m 3 /h), including comparison with LDA results are presented in Figure 2.…”

Numerical study of gas-cyclone airflow: an investigation of turbulence modelling approaches

“…Figure 10(d) shows the time-averaged tangential velocity profiles in the ejector, which shows almost linear variation in the radial direction and is nearly symmetric about the centreline. As noted by Strasser (2010) and Obermair et al (2005), the flow in this region has a solid-body vortex characteristic similar to the one at the core of the cyclone body. The axial velocity predicted by the k-ω-υ 2 model is slightly higher than DRSM model predictions at the cyclone core, while the radial velocity maximum predicted by DRSM is slighter higher than the k-ω-υ 2 model results.…”