AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Influence of Shape Factor and Effective Density on Aerodynamic Sizing of Particles Generated by the TSI/MSP 1520 Flow-Focusing Monodisperse Aerosol Generator (FMAG)
Andrea Tiwari, LIN LI, Francisco Romay, TSI Incorporated
Abstract Number: 783 Working Group: Instrumentation and Methods
Abstract The Flow-focusing Monodisperse Aerosol Generator (FMAG, Model 1520) from TSI (MSP) generates highly monodisperse particles out of both solid and liquid solutions. While liquid particles may safely be assumed to be spherical and have the same density as the bulk substance, those assumptions are not always applicable for solid particles. Both shape factor and effective density can influence the measured aerodynamic size of solid particles; this has implications for the user both in preparing solutions for aerosol generation, and from a data interpretation perspective.
This work explores the influence of shape factor and effective density on the agreement between experimental and theoretical aerodynamic particle sizes. Monodisperse supermicron particles of different compositions, including ammonium sulfate, sodium chloride, oleic acid, glycerol, etc., were generated by FMAG using the same volume fraction solution. Their aerodynamic sizes were measured by an Aerodynamic Particle Sizer (APS, Model 3321). Published literature values for shape factor and effective density are applied to calculate the theoretical aerodynamic size. The detailed comparison between the experimental and theoretical aerodynamic sizes will be presented in the poster.