Aerosol transportation in horizontal channels with gravitational effects--颗粒学报PARTICUOLOGY

Gao, Y., Zhong, K., & Kang, Y. (2019). Aerosol transportation in horizontal channels with gravitational effects. Particuology, 44, 159-168. https://doi.org/10.1016/j.partic.2018.10.002

Aerosol transportation in horizontal channels with gravitational effects

Yongwei Gao ^{a b}, Ke Zhong ^a, Yanming Kang ^a *

a School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
b School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan 750021, China

10.1016/j.partic.2018.10.002

Volume 44, June 2019, Pages 159-168

Received 19 November 2017, Revised 8 October 2018, Accepted 11 October 2018, Available online 4 March 2019, Version of Record 30 April 2019.

E-mail: ymkang@dhu.edu.cn

Highlights

• Exact solutions of the aerosol transport equation in horizontal channels are obtained.

• Gravitational effect is considered for analyzing aerosol deposition in the channel.

• Concentration profiles are asymmetric and downward tilting in the channel.

• Approximate solutions in the literature are simplified forms of the exact solutions.

Abstract

Aerosol particle deposition in a narrow horizontal channel with gravitational effects is studied in the laminar flow regime. A general explicit solution for predicting the aerosol transportation in the channel is obtained theoretically. The characteristics of the asymmetric concentration profiles and their dependence on gravitational settling are analyzed for different settings of the diffusion and sedimentation parameters. Aerosol deposition on the channel walls, which is influenced by a combination of mechanisms, is also analyzed. The results are compared with those from simplified models obtained in previous studies in which only diffusion or gravity was considered. The analysis reveals that the literature results regarding this aspect may be simplified with the present solution under specific conditions.

Graphical abstract

Keywords

Exact solution; Combined deposition; Gravitational effect; Horizontal channel; Asymmetric distribution

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