The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient
To solve the high slurry pressure and severe wear at some sections in backfilling pipelines, this study investigates the solution of using an auxiliary pipe to increase the resistance and reduce the pressure of the mine backfilling pipeline. Using computational fluid dynamics, three auxiliary pipe m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/7/1105 |
| _version_ | 1827618777512017920 |
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| author | Weixiang Wang Hongwei Mu Guodong Mei Lijie Guo Xinqi Lu Anhu Wang Ran Sun |
| author_facet | Weixiang Wang Hongwei Mu Guodong Mei Lijie Guo Xinqi Lu Anhu Wang Ran Sun |
| author_sort | Weixiang Wang |
| collection | DOAJ |
| description | To solve the high slurry pressure and severe wear at some sections in backfilling pipelines, this study investigates the solution of using an auxiliary pipe to increase the resistance and reduce the pressure of the mine backfilling pipeline. Using computational fluid dynamics, three auxiliary pipe models, a Z-shaped pipe, a S-shaped pipe and a spiral pipe were constructed and the velocity and pressure distribution characteristics of the filling slurry in the auxiliary pipes were analyzed. The function of friction loss in spiral pipes with different pitches and spiral diameters was established, and the amendment equation for calculating the effective stowing gradient was studied when using spiral pipes to increase resistance and reduce pressure. The results show that, compared with the Z-shaped pipe and the S-shaped pipe, the velocity and pressure in the spiral pipe change continuously and steadily, and there is no obvious sudden change in the local velocity and pressure. Therefore, it is difficult to burst the pipe. When the velocity is 2.5 m/s and the vertical height of the pipe is 2.5 m, the friction loss of the filling slurry in the spiral pipe can reach 3.87~21.26 times that in the vertical pipe, indicating that the spiral pipe can effectively play the role of increasing resistance and reducing pressure. The relationship between the friction loss and spiral diameter is a linear function, and the relationship between the friction loss and pitch is a quadratic function. The three are binary quadratic function relationships. The equation for calculating the effective stowing gradient is obtained, which provides a convenient method for engineering applications and industrial design. |
| first_indexed | 2024-03-09T10:15:11Z |
| format | Article |
| id | doaj.art-2f796bb8d479448292589434be7163ee |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T10:15:11Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-2f796bb8d479448292589434be7163ee2023-12-01T22:26:12ZengMDPI AGMetals2075-47012022-06-01127110510.3390/met12071105The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing GradientWeixiang Wang0Hongwei Mu1Guodong Mei2Lijie Guo3Xinqi Lu4Anhu Wang5Ran Sun6BGRIMM Technology Group, Beijing 102628, ChinaDepartment of Safety Engineering, Qingdao University of Technology, Qingdao 266106, ChinaBGRIMM Technology Group, Beijing 102628, ChinaBGRIMM Technology Group, Beijing 102628, ChinaBGRIMM Technology Group, Beijing 102628, ChinaTechnical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting, University of Science and Technology Beijing, Beijing 100083, ChinaCCCC Water Transportation Consultants Co., Ltd., Beijing 100007, ChinaTo solve the high slurry pressure and severe wear at some sections in backfilling pipelines, this study investigates the solution of using an auxiliary pipe to increase the resistance and reduce the pressure of the mine backfilling pipeline. Using computational fluid dynamics, three auxiliary pipe models, a Z-shaped pipe, a S-shaped pipe and a spiral pipe were constructed and the velocity and pressure distribution characteristics of the filling slurry in the auxiliary pipes were analyzed. The function of friction loss in spiral pipes with different pitches and spiral diameters was established, and the amendment equation for calculating the effective stowing gradient was studied when using spiral pipes to increase resistance and reduce pressure. The results show that, compared with the Z-shaped pipe and the S-shaped pipe, the velocity and pressure in the spiral pipe change continuously and steadily, and there is no obvious sudden change in the local velocity and pressure. Therefore, it is difficult to burst the pipe. When the velocity is 2.5 m/s and the vertical height of the pipe is 2.5 m, the friction loss of the filling slurry in the spiral pipe can reach 3.87~21.26 times that in the vertical pipe, indicating that the spiral pipe can effectively play the role of increasing resistance and reducing pressure. The relationship between the friction loss and spiral diameter is a linear function, and the relationship between the friction loss and pitch is a quadratic function. The three are binary quadratic function relationships. The equation for calculating the effective stowing gradient is obtained, which provides a convenient method for engineering applications and industrial design.https://www.mdpi.com/2075-4701/12/7/1105backfillingincreasing resistance and reducing pressurecomputational fluid dynamicsspiral pipestowing gradient |
| spellingShingle | Weixiang Wang Hongwei Mu Guodong Mei Lijie Guo Xinqi Lu Anhu Wang Ran Sun The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient Metals backfilling increasing resistance and reducing pressure computational fluid dynamics spiral pipe stowing gradient |
| title | The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient |
| title_full | The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient |
| title_fullStr | The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient |
| title_full_unstemmed | The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient |
| title_short | The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient |
| title_sort | characteristics of spiral pipe increasing resistance and reducing pressure and the amendment equation of stowing gradient |
| topic | backfilling increasing resistance and reducing pressure computational fluid dynamics spiral pipe stowing gradient |
| url | https://www.mdpi.com/2075-4701/12/7/1105 |
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