A novel cyclone design, named double cyclone, adds an extra cylinder wall into a conventional reversed ow cyclone. The physical performance of the double cyclone has been experimentally compared to a widely used conventional cyclone by measuring the particle concentrations both upstream and downstream of each cyclone with an Aerosizer. Tests with monodisperse polystyrene latex (PSL) particles with diameters ranging from 0.60 ¹m to 8.8 ¹m have shown that the double cyclone provides higher collection efciency than the conventional cyclone for a tested ow rate range of 10-40 L/min. In addition, the collection ef ciency difference between the double cyclone and the conventional cyclone becomes even larger as the air ow rate increases. Sharper particle-size separation characteristics were also observed for the double cyclone. Furthermore, it was found that the double cyclone operates at a lower pressure drop than the conventional cyclone at the same normalized cut size.

A novel cyclone design, named double cyclone, adds an extra cylinder wall into a conventional reversed ow cyclone. The physical performance of the double cyclone has been experimentally compared to a widely used conventional cyclone by measuring the particle concentrations both upstream and downstream of each cyclone with an Aerosizer. Tests with monodisperse polystyrene latex (PSL) particles with diameters ranging from 0.60 ¹m to 8.8 ¹m have shown that the double cyclone provides higher collection efciency than the conventional cyclone for a tested ow rate range of 10-40 L/min. In addition, the collection ef ciency difference between the double cyclone and the conventional cyclone becomes even larger as the air ow rate increases. Sharper particle-size separation characteristics were also observed for the double cyclone. Furthermore, it was found that the double cyclone operates at a lower pressure drop than the conventional cyclone at the same normalized cut size.