Experimental and mechanistic study of dispersed micrometer-sized particle resuspension in a square straight duct with rough walls (Open Access)--颗粒学报PARTICUOLOGY

Sun, Q., Yu, S., & Peng, W. (2023). Experimental and mechanistic study of dispersed micrometer-sized particle resuspension in a square straight duct with rough walls. Particuology, 83, 101-114. https://doi.org/10.1016/j.partic.2023.02.013

Experimental and mechanistic study of dispersed micrometer-sized particle resuspension in a square straight duct with rough walls (Open Access)

Qi Sun ^a, Suyuan Yu ^b, Wei Peng ^a *

a Institute of Nuclear and New Energy Technology, Cooperation Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing, 100084, China
b Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China

10.1016/j.partic.2023.02.013

Volume 83, December 2023, Pages 101-114

Received 14 January 2023, Revised 10 February 2023, Accepted 24 February 2023, Available online 4 March 2023, Version of Record 14 March 2023.

E-mail: pengwei@tsinghua.edu.cn

Highlights

• Visual experimental research on graphite dust resuspension phenomenon.

• Statistical model of rolling resuspension of particles is established.

• Distribution of fluctuating drag is obtained by large-eddy simulations.

• Consideration of non-spherical drag and rough wall adhesion on resuspension.

Abstract

The resuspension of graphite dust is an important phenomenon in the release of radioactivity and the safety of nuclear reactors during severe accidents. In this study, a visualization experimental platform is constructed to study effects of particle size, flow velocity, and wall roughness on the resuspension characteristics of graphite particles. A statistical model of particle resuspension applicable to monolayer dispersed particles is developed based on the moment equilibrium of the particles and the flow field characteristics, as calculated by the large-eddy simulation framework. The results show that particle resuspension can be divided into short- and long-term resuspension stages. Most particle resuspension occurs during the short-term stage. With increases in flow velocity and particle diameter, the aerodynamic or adhesion force acting on the particles increases, and corresponding particle resuspension fraction increases. The influence of rough walls on particle resuspension is related to both the force on the particles and the arm ratio between the wall morphology and the particle diameter. A comparison with the experimental results demonstrates that the particle resuspension model developed in this study accurately predicts the impact of flow velocity, particle size, and wall roughness on particle resuspension.

Graphical abstract

Keywords

Particle cluster; Temporal evolution; Settling; Spreading

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