Simulation of fine polydisperse particle condensational growth under an octadecane

Zhang, H., Wang, Z., Song, W., & Li, S. (2018). Simulation of fine polydisperse particle condensational growth under an octadecane–nitrogen atmosphere. Particuology, 38, 71-79. https://doi.org/10.1016/j.partic.2017.06.002

Simulation of fine polydisperse particle condensational growth under an octadecane–nitrogen atmosphere

Hua Zhang ^{a b}, Ze Wang ^{a b *}, Wenli Song ^{a b *}, Songgeng Li ^{a b}

a Center for Mesoscience, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100190, China

10.1016/j.partic.2017.06.002

Volume 38, June 2018, Pages 71-79

Received 3 January 2017, Revised 28 May 2017, Accepted 14 June 2017, Available online 12 October 2017, Version of Record 2 April 2018.

E-mail: wangze@ipe.ac.cn; wlsong@ipe.ac.cn

Highlights

• Condensational growth of particles in octadecane–nitrogen atmosphere was simulated.

• The feasibility of the model was verified with previously published experimental data.

• Low particle number or high vapor concentration benefited PSD shifting to a narrow pattern.

Abstract

The evolution of particle size distribution (PSD) of fine polydisperse particles at high number concentrations (>105 cm⁻³) was simulated through a combined model employing direct quadrature method of moments (DQMOM) with heat and mass transfer equations. The PSD was assumed to retain log-normal distribution during the heterogeneous condensation process. The model was first verified by exact solution and experimental data prior to investigating the influence of initial conditions on final PSD under an octadecane–nitrogen atmosphere. Low particle number concentrations and high vapor concentrations were beneficial to shift the PSD to larger particles having a narrower distribution. Additionally, vapor depletion has more influence on the final PSD than the heat release parameter for a number concentration of 10⁶ cm⁻³. This study may assist the design process of a gas–solid separating cyclone, to eliminate dust from high-temperature volatiles by pyrolysis of solid fuels.

Graphical abstract

Keywords

Simulation; Condensational growth; Polydisperse particles; Particle size distribution

文章导读