THE HYDRODYNAMIC ANALYSIS FOR CUTTING PRINCIPLE OF THE NEGRETTI SAMPLE HEAD
NEGRETTI采样头切割原理的动力学分析

According to two-phase hydrodynamic theories, the motion of the aerosol particles in a Negretti sample head is analyzed in this paper. The motion trajectory of the aerosol particles during the sampling of PM10 and PM2.5 is computed. The influence of various factors such as airflow flux, diameter of aerosol particles on the movement trajectory is discussed. The results show that the two-phase hydrodynamics is effective in simulating the motion of aerosol particles within an impactor. It can offer a powerful help for the design and manufacture of impactor.