Particle behavior in a turbulent pipe flow with a flat bed |
| |
| Institution: | 1. 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;2. School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK;1. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China;2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, China Academy of Sciences, Beijing, 100190, China;1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, China;2. Key Laboratory of Clean Chemical Engineering in Universities of Shandong, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China;1. Department of Chemical Engineering, Tianjin Renai College, Tianjin, 301636, China;2. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China;3. Center for Applied Energy Research, University of Kentucky, Lexington, KY, 40511, United States;4. The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China |
| |
| Abstract: | Particle behavior in a turbulent flow in a circular pipe with a bed height h = 0.5R is studied at Reb = 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. |
| |
| Keywords: | Sedimentary duct Secondary flow Particle behavior Large eddy simulation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
