Combined effects of mean flow and turbulence on sediment pickup rate
This paper aims to explore the combined main flow and turbulence influence on sediment pickup rates by investigating four purposely devised cases, namely, (1) unobstructed flow over a plane bed; (2) unobstructed flow over a rigid‐dune bed; (3) flow obstructed by a horizontal pipe; and (4) flow obstr...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/145199 |
| _version_ | 1826115361432403968 |
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| author | Cheng, Nian Sheng Wei, Mao Xing Chiew, Yee-Meng Lu, Y. S. Emadzadeh, Adel |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Cheng, Nian Sheng Wei, Mao Xing Chiew, Yee-Meng Lu, Y. S. Emadzadeh, Adel |
| author_sort | Cheng, Nian Sheng |
| collection | NTU |
| description | This paper aims to explore the combined main flow and turbulence influence on sediment pickup rates by investigating four purposely devised cases, namely, (1) unobstructed flow over a plane bed; (2) unobstructed flow over a rigid‐dune bed; (3) flow obstructed by a horizontal pipe; and (4) flow obstructed by a vertical pipe. The four cases were used to represent typical scenarios of mean flow combined with turbulence of varying intensities. By analyzing the dependence of sediment pickup rate on different combinations of the mean and turbulent flow parameters, a modified densimetric Froude number, incorporating both the bulk‐averaged velocity and maximum root‐mean‐square value of the fluctuating velocity, is found to be reasonably correlated with the measured pickup rates for all the four cases. Consequently, by relating the pickup rate with the dimensionless particle diameter and the modified densimetric Froude number, a generalized equation that predicts the pickup rates under both unobstructed as well as obstructed flow conditions is obtained. |
| first_indexed | 2024-10-01T03:54:12Z |
| format | Journal Article |
| id | ntu-10356/145199 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:54:12Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1451992020-12-15T03:46:52Z Combined effects of mean flow and turbulence on sediment pickup rate Cheng, Nian Sheng Wei, Mao Xing Chiew, Yee-Meng Lu, Y. S. Emadzadeh, Adel School of Civil and Environmental Engineering Asian School of the Environment Engineering::Civil engineering Sediment Pickup Rate Densimetric Froude Number This paper aims to explore the combined main flow and turbulence influence on sediment pickup rates by investigating four purposely devised cases, namely, (1) unobstructed flow over a plane bed; (2) unobstructed flow over a rigid‐dune bed; (3) flow obstructed by a horizontal pipe; and (4) flow obstructed by a vertical pipe. The four cases were used to represent typical scenarios of mean flow combined with turbulence of varying intensities. By analyzing the dependence of sediment pickup rate on different combinations of the mean and turbulent flow parameters, a modified densimetric Froude number, incorporating both the bulk‐averaged velocity and maximum root‐mean‐square value of the fluctuating velocity, is found to be reasonably correlated with the measured pickup rates for all the four cases. Consequently, by relating the pickup rate with the dimensionless particle diameter and the modified densimetric Froude number, a generalized equation that predicts the pickup rates under both unobstructed as well as obstructed flow conditions is obtained. Published version 2020-12-15T03:46:52Z 2020-12-15T03:46:52Z 2020 Journal Article Cheng, N. S., Wei, M. X., Chiew, Y.-M., Lu, Y. S., & Emadzadeh, A. (2020). Combined effects of mean flow and turbulence on sediment pickup rate. Water Resources Research, 56(2), e2019WR026181-. doi:10.1029/2019WR026181 0043-1397 https://hdl.handle.net/10356/145199 10.1029/2019WR026181 2 56 en Water Resources Research © 2020 American Geophysical Union. All rights reserved. This paper was published in Water Resources Research and is made available with permission of American Geophysical Union. application/pdf |
| spellingShingle | Engineering::Civil engineering Sediment Pickup Rate Densimetric Froude Number Cheng, Nian Sheng Wei, Mao Xing Chiew, Yee-Meng Lu, Y. S. Emadzadeh, Adel Combined effects of mean flow and turbulence on sediment pickup rate |
| title | Combined effects of mean flow and turbulence on sediment pickup rate |
| title_full | Combined effects of mean flow and turbulence on sediment pickup rate |
| title_fullStr | Combined effects of mean flow and turbulence on sediment pickup rate |
| title_full_unstemmed | Combined effects of mean flow and turbulence on sediment pickup rate |
| title_short | Combined effects of mean flow and turbulence on sediment pickup rate |
| title_sort | combined effects of mean flow and turbulence on sediment pickup rate |
| topic | Engineering::Civil engineering Sediment Pickup Rate Densimetric Froude Number |
| url | https://hdl.handle.net/10356/145199 |
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