Hailin Yang1, Jianzhong Lin 1, Tatleung Chan2

Department of Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, 310027 Hangzhou, China
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong


Received: November 4, 2019
Revised: January 9, 2020
Accepted: February 24, 2020

 Copyright The Author(s). 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.


Download Citation: ||https://doi.org/10.4209/aaqr.2019.11.0556 

  • Download: PDF


Cite this article:

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., https://doi.org/10.4209/aaqr.2019.11.0556


HIGHLIGHTS

  • Aerosol fluctuating coagulation resulting from the fluctuating concentrations is modeled.
  • The model is applied to an aerosol particle laden jet flow first.
  • Fluctuating aerosol concentration intensifies the aerosol coagulation.
  • Fluctuating aerosol coagulation effect comes into play at x/D = 5 and cannot be neglected.
 

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.



Aerosol Air Qual. Res. 20:-. https://doi.org/10.4209/aaqr.2019.11.0556 


Impact Factor: 2.735

5-Year Impact Factor: 2.827


SCImago Journal & Country Rank

Enter your email below to receive latest published articles in your field.