Research on key parameter prediction for non settling mineral slurry pipeline transportation
In response to the deficiencies of the study on transition velocity and turbulent hydraulic gradient in homogeneous flow,key parameters of nickel iron slurry pipeline transportation were studied using experimental test,data fitting and theoretical analysis methods.The experimental results show that both viscosity and yield stress show an increasing trend as the weight concentration of the slurry increases.the rheological comprehensive coefficient exhibits an approximately linear increasing relationship with weight concentration in laminar flow,and has a decreasing power function relationship with shear rate with an exponential value of-1.Expression for the comprehensive effective viscosity and formulas for calculating the hydraulic gradient and transitional flow velocity in laminar flow state are provided.The calculation formulas for the resistance coefficient and turbulence hydraulic gradient are obtained based on the relationship between the Darcy resistance coefficient and the Reynolds number of the slurry during turbulent flow.The comparison between the calculated values by the author's model and the measured values shows that the maximum deviation of the calculated hydraulic slope and the transition flow velocity are 12.8％and 3.9％,respectively.The variation of flow velocity within the laminar range has little effect on hydraulic gradient.
万方数据
维普
