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Effects of surface vortex on the drawdown and dispersion of floating particles in stirred tanks

Particuology 2020年第2期18卷 159-168页

作者： Wentao Xu Yangbo Tan Meng Li Jianglong Sun De Xie Zeng Liu School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan 430074China Ocean Engineering.Huazhong University of Science and Technology Wuhan 430074.China

The effects of surface vortex on the drawdown and dispersion of floating particles in stirred tanks were *** distribution and power consumption were analyzed by experiments and numerical simulations in both baffled and unbaffled tanks agitated by a Rushton *** unbaffled tanks,a non-aggregation rule was applied and the average dispersion index was found to serve as a reasonable prediction of the full drawdown of floating *** critical impeller speeds in an unbaffled tank were higher than those in a tank with vertical *** each immersion depth in a baffled tank,particles distributed more uniformly and more power was *** of snapshots of the baffled and unbaffled tanks shows that the surface vortex increases the drawdown speed while it decreases the particle distribution uniformity and power ***,the use of baffles to suppress the surface vortex provides for a more uniform particle distribution in stirred tanks.

关键词： Stirred tank surface vortex Solids drawdown Complete dispersion

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Investigation of the surface vortex in a Spillway Tunnel Intake

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Tsinghua Science and Technology 2010年第5期15卷 561-565页

作者：王英奎江春波 State Key Laboratory of Hydroscience and Engineering Tsinghua University

The surface vortex in a spillway tunnel intake was investigated in a physical model of the Xiluodu hydropower *** velocity fields were measured using the particle tracking velocimetry *** tangential velocity formula of the surface flow field was derived based on the Navier-Stokes equations,and this formula greatly improved the consistency between the numerical and experimental ***,the formula has the advantage of describing the tangential velocity more accurately than previous *** current research is based on established engineering practices,and the results provide a valuable reference for actual projects designed to prevent and eliminate surface vortexes.

关键词： surface vortex axisymmetric flow particle tracking velocimetry(PTV) tangential velocity

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Study on the critical submergence of surface vortices and the design of anti-vortex intakes

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Science China(Technological Sciences) 2011年第4期54卷 799-804页

作者： WANG YingKui JIANG ChunBo LIANG DongFang State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China Department of Engineering University of CambridgeCambridgeCB2 1PZUK

surface vortex behavior in front of the tunnel intake was investigated in this *** critical submergence of vortex was discussed based on the concept of 'critical spherical sink surface'(CSSS).The vortex formation and evolution at the tunnel intake were analyzed based on the theory of CSSS considering the effect of circulation.A theory was proposed to explain the surface *** theoretical development was verified by the physical model experiments of Xiluodu hydropower *** radial velocity and vortex circulation were considered as the main factors that influence the formation and evolution of surface ***,an anti-vortex intake configuration was proposed to weaken the air-core vortex in front of the tunnel intakes of the hydraulic structures.

关键词： critical submergence critical spherical sink surface surface vortex tunnel intake physical model experiment

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