3D Numerical Simulation of Water and Sediment Flow in Hydrocyclone Based on Coupled CFD-DEM

Yu Liming, Zou Xiaoyan, Tan Hong, Yan Weiguang, Chen Lizhi, Xiong Ziwei

Abstract

Due to the complexity of the fluid field in hydrocyclone and the difficulty of mastering the law of sediment motion, an Eulerian-Lagrange liquid-solid multiphase turbulence model combined with the kinetic theory of granular flow was used to carry out simulation based on coupled CFD-DEM water sediment two phase flow in a hydrocyclone, which analyzed the trochoid and speed of single sediment, speed of sediment group, the moving pattern and distribution of sediment group. The simulation results show that the smaller the sediment size was, the closer the distance was, the more easily uprising from downward trend to upstream, and the more difficult to be separated. For the particles of 40μm in diameter, sediment peak appeared in the interface of cylinder and cone and the separation effect of sediment was easy to be affected. But for the particles of 50μm and 60μm, sediment peak appeared in cone part and sediment had a better separation effect. Through tracking single sediment and sediment group, it can be found that the sediment almost stay in circular motion in cylinder. In cone part, sediment not only stays in circular motion but also obviously runs in line movement when they enter in sediment settling. Analyzing the moving pattern and distribution of single sediment and sand group provides a microscopic method for understanding separation efficiency and also provides an effective research method for the further study of the hydrocyclone performance.


Keywords: hydrocyclone, water and sediment flow, discrete element method, computational fluid dynamics, coupling, numerical simulation

 

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References


Cullivan J С,Williams R A,Dyakowski T,et al. New understanding of a hydrocyclone flow field and separation mechanism from computational fluid dynamics[J]. Minerals Engineering,2004,17(5 ) :651 -660.

Xu Yanxia,Tang Bo,Song Xingfu,et al. Computational study and PIV validation of flow field in a hydrocyclone [ J ] . Journal of East China University of Science and Technology ,2013 ,39 ( 1 ) : 1 -7. (in Chinese)

Jiang Ji’an,Zhao Tianbiao, Yang Xinghua,et al. Numerical simulation of flowing field in polyconical cyclone based on CFD [ J ]. Modern Mining,2013 ,535 ( 11) :21 -24. (in Chinese)

Amini S,Mowla D,Golkar M, et al. Mathematical modelling of ahydrocyclone for the down-hole oil-water separation( DOWS) [ J]. Chemical Engineering Research and Design ,2012 ,90 ( 12) :2186 -2195.

Zang Dan, Chen Ye. Effect of the cone angle on flow field and separation performance of solid-liquid hydrocyclones [ J ] . Fluid Machinery ,2009 ,37 ( 8 ) : 11 - 16. (in Chinese)

Zhong Sheng. Research on a new type porous overflow hydrocyclone [ D ]. Daqing: Northeast Petroleum University, 2012. (in Chinese)

Zhao Lixin, Jiang Minghu,Xu Baorui,et al. Development of a new type high-efficient inner-cone hydrocyclone [J]. Chemical Enginee-ring Research and Design ,2012 ,90( 12) :2129 -2134.

Narasimha M, Brennan M, Holtham P N. Large eddy simulation of hydrocyclone-prediction of air-core diameter and shape [ J ]. International Journal of Mineral Processing,2006 ,80( 1 ) :1 - 14.

Doby M J,Nowakowski A F,Yiu l,et al. Understanding air core in hydrocyclone by studyingpressure distribution as a function of

viscosity[ J ] . International Journal of Mineral Processing,2008 ,86( 1 -4) : 18 -25.

Udaya Bhaskar K,Rama Murthv Y,Ravi Raju M,et al. CFD simulation and experimental validation studies on hydrocyclone [ J ]. Minerals Engineering,2007 ,20( 1 ) ;60 -71.

Delgadillo J A,Rajamani R K. A comparative study of three turbulence-closure models for the hydrocyclone problem[ J ]. International Journal of Mineral Process ,2005 ,77 (4 ) :217 -230.

Yu Liming,Wu Pute,Niu Wenquan. Influence of the offset of labyrinth channels of drip emitters on hydraulic and anti-clogging

Yu Liming, Mei Qiyong. Anti-clogging design and experimental investigation of PIV for labyrinth-channel emitters of drip irrigation emitters[ J]. Transactions of the Chinese Society for Agricultural Machinery ,2014 ,45 ( 9 ) : 155 - 160. (in Chinese)

Liu Haisheng, He Huiqun,Ai Zhijiu, et al. Numerical simulation of inner flow field in hydrocyclone with RSM model [J]. Computer Simulation ,2006, 23(9) :243 -245,271. (in Chinese)

Tong Z В, Yang R Y,Chu К W,et al. Numerical study of effect of particle size and polydispersity on the agglomerate dispersion in a cyclonic flow[ J]. Chemical Engineering Journal ,2010 ,164 ( 3 ) *.432 -441.

Chu К W,Wang В, Yu A B,et al. CFD - DEM modelling of multiphase flow in dense medium cyclones [ J]. Powder Technology, 2009,193(3) :235 -247.

Qiu Liuchao,Wu Chuanyu .A hybrid DEM/CFD approach for solid-liquid flows[J]. Journal of Hydrodynamics,2014,26( 1) :19 -25.

Huang Si,Yang Fuxiang,Su Xianghui. Unsteady numerical simulation for solid-liquid two-phase flowr in centrifugal pump by CFD— EDEM coupling[ J ]. Science and Technology Review ,2014 ,32 ( 37) :28 -31. (in Chinese)


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