관성충돌판의 Cavity 각도 변화에 대한 관성충돌기 효율곡선에 관한 실험적 연구

Abstract

Inertial impactors have been used widely to measure particle size distribution, analyze chemical composition, and obtain aerosol sampling. Conventional impactors have particle-surface interaction problems. These problems reduced separation efficiency. To enhance separation efficiency. it is desirable that surface is coated. But coated surface has significant problem in high temperature environment and bio aerosol sampling. The cavity impactor that is not a conventional design can be used in such situations. The efficiency of a conventional impactor and the cavity impactor was investigated for different Reynolds numbers in this paper. 50% cut-off aerodynamic particle diameter was smaller in the cavity impactor than in the conventional impactor because of flow direction change. Fine particle contamination and reentrainment were reduced in the cavity impactor.