Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline
The migration critical velocity of small-sized sediment particles was investigated through experiments under different particle sizes, pipe wall roughness, and sediment thickness. Such experiments were carried out to simulate the erosion process of small-sized sediment particles in a rainwater pipel...
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IWA Publishing
2021
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oai:doaj.org-article:014b1d73cd8f43cab810e5068f90b2be2021-11-06T07:09:13ZExperiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline1606-97491607-079810.2166/ws.2020.341https://doaj.org/article/014b1d73cd8f43cab810e5068f90b2be2021-03-01T00:00:00Zhttp://ws.iwaponline.com/content/21/2/593https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798The migration critical velocity of small-sized sediment particles was investigated through experiments under different particle sizes, pipe wall roughness, and sediment thickness. Such experiments were carried out to simulate the erosion process of small-sized sediment particles in a rainwater pipeline during rainfall. The mathematical models were established via quadratic fitting to calculate the critical velocity of migration. Results showed that small particles had powerful cohesive force, and aggregates had strong erosion resistance. So, for the small-sized particles (in the range of 0.33–0.83 mm), the smaller the particle size, the larger the critical velocity. When the pipe wall roughness was large, the ‘starting’ particle resistance was high. A large flow dynamic was needed to overcome such resistance. Thus, the critical velocity was great. The critical velocity was also large when the sediment thickness was large. The difference rate between the critical velocity calculated by mathematical models and the measured value was within the range of −3.60% to 5.33% and had good consistency. Under the research conditions, the critical velocity ranges of the four commonly used pipes; namely, plexiglass, steel/PVC, galvanized/clay, and cast iron pipes, were calculated. HIGHLIGHTS The aggregates of small particles in rainwater pipes have strong erosion resistance.; The critical velocity is great when particle size is small (d50 = 0.33–0.83 mm).; Critical velocity significantly decreases when the pipe wall roughness reduces.; Difference rate between calculated and measured values is from −3.60% to 5.33%.; The critical velocity ranges of the four commonly used pipes have been calculated.;Cuiyun LiuYanzhi ChenYuting YangJingqin ZhouYiyang WangJie ZhouXiaohua ZhangIWA Publishingarticlecritical velocityerosion processmigrationrainwater pipelinesediment particlesWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 2, Pp 593-605 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
critical velocity erosion process migration rainwater pipeline sediment particles Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 |
| spellingShingle |
critical velocity erosion process migration rainwater pipeline sediment particles Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Cuiyun Liu Yanzhi Chen Yuting Yang Jingqin Zhou Yiyang Wang Jie Zhou Xiaohua Zhang Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| description |
The migration critical velocity of small-sized sediment particles was investigated through experiments under different particle sizes, pipe wall roughness, and sediment thickness. Such experiments were carried out to simulate the erosion process of small-sized sediment particles in a rainwater pipeline during rainfall. The mathematical models were established via quadratic fitting to calculate the critical velocity of migration. Results showed that small particles had powerful cohesive force, and aggregates had strong erosion resistance. So, for the small-sized particles (in the range of 0.33–0.83 mm), the smaller the particle size, the larger the critical velocity. When the pipe wall roughness was large, the ‘starting’ particle resistance was high. A large flow dynamic was needed to overcome such resistance. Thus, the critical velocity was great. The critical velocity was also large when the sediment thickness was large. The difference rate between the critical velocity calculated by mathematical models and the measured value was within the range of −3.60% to 5.33% and had good consistency. Under the research conditions, the critical velocity ranges of the four commonly used pipes; namely, plexiglass, steel/PVC, galvanized/clay, and cast iron pipes, were calculated. HIGHLIGHTS
The aggregates of small particles in rainwater pipes have strong erosion resistance.;
The critical velocity is great when particle size is small (d50 = 0.33–0.83 mm).;
Critical velocity significantly decreases when the pipe wall roughness reduces.;
Difference rate between calculated and measured values is from −3.60% to 5.33%.;
The critical velocity ranges of the four commonly used pipes have been calculated.; |
| format |
article |
| author |
Cuiyun Liu Yanzhi Chen Yuting Yang Jingqin Zhou Yiyang Wang Jie Zhou Xiaohua Zhang |
| author_facet |
Cuiyun Liu Yanzhi Chen Yuting Yang Jingqin Zhou Yiyang Wang Jie Zhou Xiaohua Zhang |
| author_sort |
Cuiyun Liu |
| title |
Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| title_short |
Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| title_full |
Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| title_fullStr |
Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| title_full_unstemmed |
Experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| title_sort |
experiment and fitting calculation of migration critical velocity of small-sized sediment particles erosion in rainwater pipeline |
| publisher |
IWA Publishing |
| publishDate |
2021 |
| url |
https://doaj.org/article/014b1d73cd8f43cab810e5068f90b2be |
| work_keys_str_mv |
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| _version_ |
1718443773377118208 |