Particle behavior in a turbulent pipe flow with a flat bed--颗粒学报PARTICUOLOGY

Liu, M., Zhao, Y., Yan, Y., Fairweather, M., & Yao, J. (2023). Particle behavior in a turbulent pipe flow with a flat bed. Particuology, 81, 58-72. https://doi.org/10.1016/j.partic.2022.12.016

Particle behavior in a turbulent pipe flow with a flat bed

Min Liu ^a, Yanlin Zhao ^a *, Yudong Yan ^a, Michael Fairweather ^b, Jun Yao ^a

a International Joint Laboratory on Clean Energy Science and Technology, Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing, 102249, China
b School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

10.1016/j.partic.2022.12.016

Volume 81, October 2023, Pages 58-72

Received 5 September 2022, Revised 5 December 2022, Accepted 19 December 2022, Available online 13 January 2023, Version of Record 17 January 2023.

E-mail: ylzhao@cup.edu.cn

Highlights

• Particle behavior in a turbulent sedimentary duct flow is studied.

• Formation of the secondary flow is affected by the sedimentary duct wall curvature.

• Behaviors of 5 μm and 50 μm particles are quite different.

• Rates of particle deposition and resuspension depend on combined effect of secondary flow and gravity.

Abstract

Particle behavior in a turbulent flow in a circular pipe with a bed height h = 0.5R is studied at Re_b = 40,000 and for two sizes of particles (5 μm and 50 μm) using large eddy simulation, one-way coupled with a Lagrangian particle tracking technique. Turbulent secondary flows are found within the pipe, with the curved upper wall affecting the secondary flow formation giving rise to a pair of large upper vortices above two smaller vortices close to the pipe floor. The behavior of the two sizes of particle is found to be quite different. The 50 μm particles deposit forming irregular elongated particle streaks close to the pipe floor, particularly at the center of the flow and the pipe corners due to the impact of the secondary flows. The deposition and resuspension rate of the 5 μm particles is high near the center of the floor and at the pipe corners, while values for the 50 μm particles are greatest near the corners. Near the curved upper wall of the pipe, the deposition rate of the 5 μm particles increases in moving from the wall center to the corners, and is greater than that for the larger particles due to the effects of the secondary flow. The maximum resuspension rate of the smaller particles occurs above the pipe corners, with the 50 μm particles showing their highest resuspension rate above and at the corners of the pipe.

Graphical abstract

Keywords

Sedimentary duct; Secondary flow; Particle behavior; Large eddy simulation

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