Design and Simulation of Sampling Device in Single Particle Mass Spectrometer

Aerodynamic lens-nozzle is widely used as sampling device in single particle mass spectrometer recently. For the analysis need of PM2.5, aerodynamic lens-nozzle with a focusing ability from 0.3 to 3 μm was optimally designed. Fluent software was chosen to numerically simulate the particle motion in the aerodynamic lens-nozzle. Simulation results demonstrate that the performance of particle in the range of 0.3—3 μm in the optimal design sampling device is very well. Particle beam diameter at a distance of 24 cm downstream of the nozzle exit is less than 0.03 mm. Accordingly, the optimal design sampling device can satisfy the requirement of tightly focusing PM2.5 in single particle mass spectrometer.