10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Effect of Particle Morphology on Performance of an Electrostatic Air–Liquid Interface Cell Exposure System
TA-CHIH HSIAO, Jing-Chi Lin, Hsiao-Chi Chuang, Tsun-Jen Cheng, National Central University
Abstract Number: 238 Working Group: Aerosol Exposure
Abstract The particle morphology can affect the performance of electrostatic-precipitator air–liquid interface (ESP-ALI) cell exposure system as well as cell toxicity. In this study, three types of monodisperse aerosols—spherical sucrose particles, nonspherical soot aggregates, and silver aggregates/agglomerates—were selected to evaluate the collection efficiency at a flow rate ranging from 0.3 to 1.5 lpm. To quantify the particle morphology, the fractal dimension (Df) of testing aerosols were characterized. At identical conditions, the penetration rate for fine particles (dp = 100–250 nm) under different operating conditions was correlated with a characteristic exponential curve using a dimensionless drift velocity (Vc/Vavg,r) as the scaling parameter. For ultrafine particles (UFPs, dp< 100 nm) with different particle morphologies, the particle penetrations in the ESP-ALI were similar, but their diffusion losses were not negligible. By contrast, for fine particles, the collection efficiency of soot nanoaggregates (Df = 2.29) was higher than that of spherical sucrose particles. This might be due to the simultaneous influences of the electric field–induced alignment and the flow field–induced alignment. Furthermore, based on Zhibin and Guoquan’s Deutsch model, a quadratic equation was applied to fit the experimental data and to predict the performance of the ESP-ALI.