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Title: Effect of fluctuating aerosol concentrations on the aerosol distributions in a turbulent jet
Authors: Yang, HL
Lin, JZ
Chan, TT 
Issue Date: Jul-2020
Source: Aerosol and air quality research, 7 Jul, 2020, v. 20, no. 7, special issue, p. 1629-1639
Abstract: We apply the Reynolds averaging method to derive the averaged particle general dynamic equation (APGDE), which models the effect of fluctuations in aerosol concentrations on coagulation, referred to as the fluctuating coagulation term (FCT), based on the turbulent kinetic energy. The APGDE is numerically solved using the Taylor-series expansion method of moments for a turbulent jet; the equation is then validated by comparing some of the results with experimental values. Obtaining the distribution and evolution of the aerosol particle number concentration, mass concentration, mean diameter and geometric standard deviation both when the FCT is incorporated and when it is excluded, we find that the contribution of fluctuating concentrations to the coagulation becomes a factor when x/D = 5 and reaches a stable state when x/D = 20. When the FCT is considered, the number concentration, mean diameter and geometric standard deviation are clearly lower, larger and greater, respectively. The fluctuating concentrations intensify the coagulation, reduce the number concentration and increase the mean diameter. Therefore, such fluctuations in a turbulent jet cannot be neglected.
Keywords: Aerosol particles
Fluctuating aerosol concentration
Fluctuating coagulation
Aerosol distribution
Turbulent jet
Publisher: Chinese Association for Aerosol Research in Taiwan
Journal: Aerosol and air quality research 
ISSN: 1680-8584
DOI: 10.4209/aaqr.2019.11.0556
Description: 11th Asian Aerosol Conference (AAC), May 27-30, 2019, City Univ Hong Kong, Kowloon, Hong Kong
Rights: Copyright The Author's institution. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
The following publication Yang, H., Lin, J. and Chan, T. (2020). Effect of Fluctuating Aerosol Concentrations on the Aerosol Distributions in a Turbulent Jet. Aerosol Air Qual. Res. 20: 1629–1639 is available at
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