Experimental investigation has been carried out to study possible method to increase the collection efficiency of the conventional cyclone separator. In order to find the appropriate method, the mean velocity and static pressure fields in the cyclone separator were measured by using 5-hole and 3-hole pitot tubes. It was found that the point of zero vertical velocity is located at a distance of about sixty percent of the radius from the center line.
Since turbulence contributes to the particle deposition process in two phase gas-solids flow, a grid was inserted near to the cyclone wall to increase the turbulence level. The gaps between the grid and the wall used in this study were 5%, 10% and 25% radius from the wall.
The overall collection efficiency was measured by using uniform alumina powder whose average diameter was 20-25 um. The collection efficiencies were 0.92, 0.88 and 0.96 respectively.
There is tendency to increase the efficiency when the location approaches the zero vertical velocity region. It is suggested that appropriate guide vane of small chord lenth at this zero vertical velocity region might increase the overall efficiency.