- 期刊
Control of Nanoparticles by an Axial Flow Cyclone Operating in Vacuum Conditions
真空狀況下利用軸向流旋風器去除奈米微粒之研究
摘要
Solid (NaCl) and liquid (OA, oleic acid) monodisperse nanoparticles in the size range between 8.6 to 100 nm were generated to test the collection efficiency of an axial flow cyclone at low-pressure conditions. The experimental results show that the collection efficiency increases for both tested particles when the pressure at the cyclone inlet decreases at a fixed flow rate. The cut-off aerodynamic diameter of OA and NaCl particles was decreased from 49.8 and 47.1 nm to 23.1 and 21.2 nm when the pressures at the cyclone inlet was decreased from 6 to 5.4 torr, respectively. Experimental results also show that the collection efficiency for NaCl and OA particles is very close to each other for aerodynamic diameter ranging from 25 to 180 nm at the inlet pressure of 5.4 torr, or for aerodynamic diameter smaller than 60 nm at the inlet pressure of 6 torr. The collection efficiency for OA is slightly better than NaCl for aerodynamic diameter larger than 60 nm at the inlet pressure of 6 torr. The effect of deposited particles on the cyclone wall on collection efficiency of NaCl particles was also determined in this study. The collection efficiency was found to increase slightly (＜ 10 %) after 1-h loading (loaded mass: 0.33 mg) and there was no significant change of collection efficiency after 3-h (1.24 mg) and 5-h loading (1.73 mg).
並列摘要
Solid (NaCl) and liquid (OA, oleic acid) monodisperse nanoparticles in the size range between 8.6 to 100 nm were generated to test the collection efficiency of an axial flow cyclone at low-pressure conditions. The experimental results show that the collection efficiency increases for both tested particles when the pressure at the cyclone inlet decreases at a fixed flow rate. The cut-off aerodynamic diameter of OA and NaCl particles was decreased from 49.8 and 47.1 nm to 23.1 and 21.2 nm when the pressures at the cyclone inlet was decreased from 6 to 5.4 torr, respectively. Experimental results also show that the collection efficiency for NaCl and OA particles is very close to each other for aerodynamic diameter ranging from 25 to 180 nm at the inlet pressure of 5.4 torr, or for aerodynamic diameter smaller than 60 nm at the inlet pressure of 6 torr. The collection efficiency for OA is slightly better than NaCl for aerodynamic diameter larger than 60 nm at the inlet pressure of 6 torr. The effect of deposited particles on the cyclone wall on collection efficiency of NaCl particles was also determined in this study. The collection efficiency was found to increase slightly (＜ 10 %) after 1-h loading (loaded mass: 0.33 mg) and there was no significant change of collection efficiency after 3-h (1.24 mg) and 5-h loading (1.73 mg).