3-dimensional Simulation of Micro Virtual Impactor
In this study, we examined the fluid flow and particle motion in the virtual impactor (VI) by 3-dimensional numerical simulation using computational fluid dynamics (CFD). Also, we calculated collection efficiency and wall loss of the MVI and compared with previous experimental results by other researcher. A commercial software, GAMBIT (2.3.16, Fluent Inc.) was used to generate geometry and mesh, and another commercial software, FLENT (6.3.26, Fluent Inc.) was used to calculate flow and particle motion. The Eulerian modeling approach and laminar, RNG k-ε viscous model was used to calculate flow motion. Discrete particle motion was calculated by the Lagrangian modeling approach. For calculate the collection efficiency, we took tracking each particle’s final destination from their various initial positions, and calculated particle concentration distribution at the initial position, inlet, with Eulerian method. In conclusion, the calculated geometric cut-off diameter (GCD) of VI was 1.57 μm, and maximum wall loss (MWL) was 38.8%. These results were larger than experimental results (0.57 μm for GCD, 5%p. for MWL) of previous work, but shape of the collection efficiency curve are very similar to experiment result.
Virtual impactor Simulation Collection efficiency Particle Concentration
Y.H. Joe J. Hwang
School of Mechanical Engineering,Yonsei University,Sinchon-dong,Seodaemun-gu,Seoul,Korea,120-749
国际会议
西安
英文
1255-1262
2011-08-17(万方平台首次上网日期,不代表论文的发表时间)