Effects of Model Shape of Hemispheric-Head Cyclone Separator on Collection Performance

The hemispheric head cyclone separator has considerably higher collection efficiency (separation performance) than a conventional cyclone separator with a flat head. In our previous study, we investigated numerically the air flow in the hemispheric head cyclone separators with different shape in order to optimize the shape of the hemispheric head cyclone separator. As the numerical results of only air flow, we proposed the highest particle collection performance model of hemispheric head cyclone separator. It was predicted that the height of the inlet pipe has a significant effect on its collection efficiency. In this study, the motion of particles in the air flow field is calculated using the numerical airflow velocity field in the different shape model and then the collection efficiency of particles is estimated. However, the particle motion is calculated considering only drag and gravity without considering interaction with fluid and interference between particles. It is shown that the highest collection performance model is shown by comparing the particle motions and the particle collection efficiencies. In the model with the lowest position of the inlet pipe, it was found that the upward outflow motion of particles entering the dust holder reduced the collection efficiency.