Influence of Phosphorus on the Fluid Variability Characteristics of Sediment-laden Flow
[Objective]This study aims to explore the effect of phosphorus on the fluid variability characteristics of sediment-laden flows.[Methods]A self-made double vertical tube rheometer was used to study the influence of phosphorus on fluid types,rheological parameters,and the critical threshold of fluid variation in sediment-laden flows with different concentrations.[Results](1)Phosphorus concentration,sediment concentration,and physical and chemical properties of sediment were the main factors influencing the fluid variability in sediment-laden flows.At 25 ℃,the viscosity coefficient and Bingham yield stress increased by0.48～1.47 mPa·s and 3.49～6.84 N/m2,respectively,with an increase of 0.1 g/cm3 in calcium superphosphate concentration.(2)With the increase of phosphorus and sediment content,phosphorus-laden sediment-laden flows transitioned from Newtonian fluid to Bingham fluid.A computational model was developed and validated to calculate rheological parameters such as viscosity coefficient and Bingham yield stress.(3)The critical concentration threshold for the fluid variability of phosphorus-sediment-laden flows was given.When phosphorus concentration increased from 0 to 0.45 g/cm3,the critical concentration threshold for fluid variability in sediment-laden flows decreased by 49％,indicating that the presence of phosphorus accelerated the fluid variability of sediment-laden flows.Therefore,the increase of phosphorus promoted the process of erosion water flow from Newtonian fluid to Bingham fluid,which affected the energy dissipation process in the erosion flow.[Conclusion]The research findings provide a new scientific basis for in-depth understanding of the transport mechanism of erosive polluted water flows.
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