Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System
The mixing, migration, and degradation of pollutants in sewers are the main causes for pipeline corrosion and the increased pollution scope. The clarification of the turbulent mixing characteristics in pipelines is critical for finding the source of pollution in a timely fashion and inspecting pipel...
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MDPI AG
2020-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/11/3899 |
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| author | Bin Sun Quan Liu Hongyuan Fang Chao Zhang Yuanbo Lu Shun Zhu |
| author_facet | Bin Sun Quan Liu Hongyuan Fang Chao Zhang Yuanbo Lu Shun Zhu |
| author_sort | Bin Sun |
| collection | DOAJ |
| description | The mixing, migration, and degradation of pollutants in sewers are the main causes for pipeline corrosion and the increased pollution scope. The clarification of the turbulent mixing characteristics in pipelines is critical for finding the source of pollution in a timely fashion and inspecting pipelines’ damaged locations. In this paper, numerical simulations and experiments were conducted to investigate the turbulent mixing characteristics in pipelines by studying a T-junction system, of which four variables (main pipe diameter <i>φ</i>, cross-flow flux <i>Q</i>, mixing ratio <i>δ</i>, the incident angle of T-junctions <i>θ</i>) were considered. The coefficient of variation (COV) of the salt solution was selected as the evaluation index and effective mixing length (<i>L<sub>EML</sub></i>) was defined for quantitative analysis. The numerical results were found to be in good agreement with the experimental results. The results reveal that the values of <i>L<sub>EML</sub></i> rise as <i>Q</i> or <i>φ</i> increase and decrease with the increase of <i>δ</i>, where the influence of <i>φ</i> is much greater than <i>Q</i> and <i>δ</i>, and there is no obvious regularity between <i>L<sub>EML</sub></i> and <i>θ</i>. By dimensional analysis and multivariate nonlinear regression analysis, a dimensionless relationship equation in harmony with the dimensional analysis was fitted, and a simplified equation with the average error of 4.01% was obtained on the basis of correlation analysis. |
| first_indexed | 2024-03-10T19:21:33Z |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T19:21:33Z |
| publishDate | 2020-06-01 |
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| series | Applied Sciences |
| spelling | doaj.art-26bbe582bc5849c9859603a69e9977f42023-11-20T02:52:19ZengMDPI AGApplied Sciences2076-34172020-06-011011389910.3390/app10113899Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction SystemBin Sun0Quan Liu1Hongyuan Fang2Chao Zhang3Yuanbo Lu4Shun Zhu5School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaThe mixing, migration, and degradation of pollutants in sewers are the main causes for pipeline corrosion and the increased pollution scope. The clarification of the turbulent mixing characteristics in pipelines is critical for finding the source of pollution in a timely fashion and inspecting pipelines’ damaged locations. In this paper, numerical simulations and experiments were conducted to investigate the turbulent mixing characteristics in pipelines by studying a T-junction system, of which four variables (main pipe diameter <i>φ</i>, cross-flow flux <i>Q</i>, mixing ratio <i>δ</i>, the incident angle of T-junctions <i>θ</i>) were considered. The coefficient of variation (COV) of the salt solution was selected as the evaluation index and effective mixing length (<i>L<sub>EML</sub></i>) was defined for quantitative analysis. The numerical results were found to be in good agreement with the experimental results. The results reveal that the values of <i>L<sub>EML</sub></i> rise as <i>Q</i> or <i>φ</i> increase and decrease with the increase of <i>δ</i>, where the influence of <i>φ</i> is much greater than <i>Q</i> and <i>δ</i>, and there is no obvious regularity between <i>L<sub>EML</sub></i> and <i>θ</i>. By dimensional analysis and multivariate nonlinear regression analysis, a dimensionless relationship equation in harmony with the dimensional analysis was fitted, and a simplified equation with the average error of 4.01% was obtained on the basis of correlation analysis.https://www.mdpi.com/2076-3417/10/11/3899T-junctionpipe flowturbulent mixingturbulent intensityeffective mixing length |
| spellingShingle | Bin Sun Quan Liu Hongyuan Fang Chao Zhang Yuanbo Lu Shun Zhu Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System Applied Sciences T-junction pipe flow turbulent mixing turbulent intensity effective mixing length |
| title | Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System |
| title_full | Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System |
| title_fullStr | Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System |
| title_full_unstemmed | Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System |
| title_short | Numerical and Experimental Study of Turbulent Mixing Characteristics in a T-Junction System |
| title_sort | numerical and experimental study of turbulent mixing characteristics in a t junction system |
| topic | T-junction pipe flow turbulent mixing turbulent intensity effective mixing length |
| url | https://www.mdpi.com/2076-3417/10/11/3899 |
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