Numerical Simulation And PIV Experimental Research Of Two-dimensional On Power-Law Fluid In Circular Pipe

The phenomenon of helical flow of Power-Law Fluid in circular pipe is the most common in the oil extraction,particularly used in electric submersible pump.In the process of oil extraction,most of the time,the liquid from oil extraction show the Features of turbulence.Turbulent is the most complex form in the motion of viscous liquid.The motion chartacterstic of turbulence is that liquid particles Continuous doping in the motion proccess.Except a small number of highly viscous and low speed fluid flow,the flow problem is almost turbulent flow in oil industry.In recent years,with the development of computational fluid dynamics and the measuring technique of fluid field,numerical simulation and PIV technology are spread and applied in the research fields of flow field characteristics.So the developing of numerical simulation and PIV experimental research on power-law fluid in annulus is of certain theoretic and engineering significance.In this paper,according to the experiment parameters used in PIV experiment,the physical models of circular pipe is set up in VR-Editor of PHOENICS in three dimensional Cartesian coordinate system,in the process of numerical simulation,finite volume method is used to discretise the governing equantions and the simplest algorithm is employed to solve the disctretised equations,the k-εcalculating turbulence model is used and the method of wall functions is used near wall,then the numerical simulation calculation of helical flow in circular pipe is carried out.Through post-processing of the data by using tecplot,sci and origin software,the velocity contour,velocity vector,streamline and the distribution of the axial velocity of the flow field in circular pipe are obtained,then the effects of fluid viscosity and input flow are analyzed in detail.The streamline shows that there is a secondary flow in turbulent helical flow field of circular pipe.The turbulent helical flow field of power-law fluid in circular pipe is simulated successfully by PHOENICS software for the first time in this paper.The numerical simulation result is basically accord with the PIV experimental result,it indicates that the numerical simulation of annular flow field by PHOENICS is viable,and validates the reliability of the numerical simulation.