Study of poly-disperse aerosols deposition in turbulent flow with different Reynolds numbers--颗粒学报PARTICUOLOGY

Gao, Z., Chen, Y., Zhang, D., Chen, P., Tong, L., & Cao, X. (2024). Study of poly-disperse aerosols deposition in turbulent flow with different Reynolds numbers. Particuology, 89, 32-43. https://doi.org/10.1016/j.partic.2023.10.012

Study of poly-disperse aerosols deposition in turbulent flow with different Reynolds numbers

Zhichao Gao^a, Yongzheng Chen^b, Dandi Zhang^a, Peng Chen^b, Lili Tong^a, Xuewu Cao ^a *

a School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
b China Nuclear Power Technology Research Institute Co., Ltd., Shenzhen, 518000, China

10.1016/j.partic.2023.10.012

Volume 89, June 2024, Pages 32-43

Received 29 August 2023, Revised 11 October 2023, Accepted 20 October 2023, Available online 4 November 2023, Version of Record 5 December 2023.

E-mail: caoxuewu@sjtu.edu.cn

Highlights

• Poly-disperse aerosol turbulent deposition is studied in a wide range of Reynolds number (Re).

• Aerosol rebound occurring under high Re turbulent flow reduces deposition velocity.

• A new aerosol deposition model considering particle-surface rebound is developed.

Abstract

The turbulent deposition mechanism is one of the main mechanisms of aerosol deposition in nuclear power plant tubes. An experimental study of poly-disperse aerosol deposition in a horizontal tube is conducted, where the nominal Reynolds number (Re) is in a range of 3600–200,000. The aerosol deposition velocity first increases and then decreases with the increase of Res, and at high Re, particle rebound occurs during aerosol deposition in the tube. When the Re is low, the aerosol deposition velocity increases with the increase of aerosol diameter. When the Re is greater than 60,000, the deposition velocity first increases and then decreases with the increase of aerosol diameter due to particle surface rebound. A new aerosol deposition model has been developed by establishing the energy conservation equation of the rebounded particles in the viscous sublayer. The calculated results of the new model are in good agreement with these experimental results, and the error between the aerosol deposition velocity calculated by the model and experimental results is between −60% and 150%.

Graphical abstract

Keywords

Aerosol; Turbulent deposition; Rebound; High Reynolds number

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