The effect of nanoparticle convection-diffusion loss on the transfer function of an aerosol particle mass analyzer

Guan Yu Lin, Bo Xi Liao, Neng Jiun Tzeng, Chun Wan Chen, Shi Nian Uang, Sheng Chieh Chen, David Y.H. Pui, Chuen-Tinn Tsai*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The existing theoretical response spectra of APM-3600 agree well with the experimental data for submicron particles larger than 100 nm in the electrical mobility diameter but not for nanoparticles. In this study, a 2-D numerical model was developed to predict the transfer function and response spectra of APM-3600 based on the detailed simulation of flow and particle concentration fields. It was found that recirculation flows existed in the annular classifying region and APM's inlet and outlet regions, which led to enhanced convection-diffusion loss of nanoparticles compared to that without considering flow recirculation. As a result, the APM underestimates the mass of naonoparticles due to the shift of the peak position of the transfer function to a larger diameter than the targeted diameter. The response spectra calculated with the simulated transfer function agree well both in shapes and peak values with the experimental data present in a previous study for both nanoparticles and submicron particles larger than 100 nm. The predicted particle masses also agree well with the PSL's experimental data of the article.Copyright 2014 American Association for Aerosol Research © 2014

Original languageEnglish
Pages (from-to)583-592
Number of pages10
JournalAerosol Science and Technology
Volume48
Issue number6
DOIs
StatePublished - 3 Jun 2014

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