| Autor: |
ZHANG Yuanyuan, GAO Jian’en, LI Wenzheng, GAO Zhe, WANG Zhaorun, WANG Lu |
| Jazyk: |
čínština |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Shuitu Baochi Xuebao, Vol 38, Iss 1, Pp 22-30 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1009-2242 |
| DOI: |
10.13870/j.cnki.stbcxb.2024.01.016 |
| Popis: |
[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 by 0.48~1.47 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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