Performance evaluation of an API AerosizerTM

A numerical method was developed to simulate the compressible flow field and particle trajectory in an API AerosizerTM. Experimental particle time-of-flights (τTOF) data using monodisperse solid and liquid particles were also obtained. Theoretical particle τTOF results were compared with the present experimental data and those of Cheng et al. (1993, J. Aerosol Sci. 26, 501–514). Good agreement was found for solid particles. The original τTOF calibration for the API AerosizerTM was found to underestimate measured τTOF mainly because of the assumption of one-dimensional flow in the nozzle, and incorrect use of the particle drag coefficient in the supersonic flow field. Effects of decreasing ambient pressure and increasing particle density on increasing τTOF were found to be important.