Experimental study of the settling of twin spherical particles released side by side: The impact of particle size, fluid viscosity, initial spacing, and particle density  被引量:1

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作  者:Yang Xiao Jieqing Liu Pei Zhang Jian Zhou Dongfang Liang Zhihao Wang Taotao Zhang Saiyu Yuan Hongwu Tang 

机构地区:[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing,China [2]Yangtze Institute for Conservation and Development,Hohai University,Nanjing,China [3]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,China [4]Institute of Water Science and Technology,Hohai University,Nanjing,China [5]School of Engineering,Westlake University,Hangzhou,China [6]Department of Engineering,University of Cambridge,Cambridge,UK

出  处:《International Journal of Sediment Research》2023年第1期83-96,共14页国际泥沙研究(英文版)

基  金:funded by the National Natural Science Foundation of China(Grant Nos.U2240209 and 52079044);the Natural Science Foundation of Jiangsu Province(Grant No.BK20191299);the Water Conservancy Science and Technology Project of Jiangsu Province(Grant No.2021055);the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering(Grant No.521013152);the 111 Project(Grant No.B17015).

摘  要:The settling of solid particles in a fluid is an important process that needs to be considered in many fields of research.For example,the interactions among particles and between particles and the surrounding fluid are important topics in studying suspended sediment transport and water clarification.In this paper,the settling processes and interactions of twin spherical particles released side by side were experimentally studied.The Reynolds number varied in the range of 1-300,which is within the transition zone.Particle Tracking Velocimetry(PTV)and Particle Image Velocimetry(PIV)were utilized to capture the settlement trajectory,and provide insight into the flow fields around the particles.The influences of particle size,fluid viscosity,initial spacing,and particle density on the settling process were systematically investigated.The experimental results reveal that the initial spacing between the twin particles(l_(0)*)and the Reynolds number(Re)are the two most important factors affecting particle settling.The interaction between particles comprises only repulsion when the initial spacing is small,while the density of particles has little effect on the final settling state when the initial spacing is not very small.The flow fields around different particles are similar for the same Re,leading to similar final settlement behaviors,except for the case of l_(0)*=0,when the influence of particle rotation cannot be ignored.Except for the case of l_(0)*=0,although the particle density has little effect on the final settling behavior,it affects the repulsive process during settling.The final repulsive distance between the twin particles is highly dependent on Re and l_(0)*.Two critical Re values exist(~10 and~100),where the repulsive distance is negatively correlated with Re when Re<10,but it is positively correlated with Re when Re>100.However,the repulsive distance is always negatively correlated with l_(0)*.These findings can improve understanding of more complex phenomena such as the particle group settling process

关 键 词:Particle settlement Repulsion of particles Particle tracking velocimetry(PTV) Particle image velocimetry(PIV) Particle density 

分 类 号:TV14[水利工程—水力学及河流动力学]

 

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