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...

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Main Authors: Cheng, Nian Sheng, Wei, Mao Xing, Chiew, Yee-Meng, Lu, Y. S., Emadzadeh, Adel
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/145199
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Sediment Pickup Rate
Densimetric Froude Number
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
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.
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
format Article
author Cheng, Nian Sheng
Wei, Mao Xing
Chiew, Yee-Meng
Lu, Y. S.
Emadzadeh, Adel
author_sort Cheng, Nian Sheng
title 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_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_sort combined effects of mean flow and turbulence on sediment pickup rate
publishDate 2020
url https://hdl.handle.net/10356/145199
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