Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law

Flow resistance in open channels is usually estimated by applying the approach that is developed originally for pipe flows. Such estimates may be useful for engineering applications but always differ from measurements to some extent. This paper first summarizes empirical approaches that have been pr...

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Main Authors: Cheng, Nian-Sheng, Nguyen, Hoai Thanh, Zhao, Kuifeng, Tang, Xiaonan
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2012
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Online Access:https://hdl.handle.net/10356/101741
http://hdl.handle.net/10220/7654
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1017412020-03-07T11:45:53Z Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law Cheng, Nian-Sheng Nguyen, Hoai Thanh Zhao, Kuifeng Tang, Xiaonan School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Water resources Flow resistance in open channels is usually estimated by applying the approach that is developed originally for pipe flows. Such estimates may be useful for engineering applications but always differ from measurements to some extent. This paper first summarizes empirical approaches that have been proposed in the literature to reconcile the resistance difference. These include various modifications of the pipe friction for applications to rectangular ducts and open channel flows. An improved friction equation is then derived for evaluating flow resistance of smooth rectangular open channels. Comparisons are made with experimental data reported by previous researchers and those collected in the present study. It is shown that the new proposed equation is applicable for both narrow and wide channels and is more accurate than those available in the literature. Accepted version 2012-03-22T01:14:02Z 2019-12-06T20:43:44Z 2012-03-22T01:14:02Z 2019-12-06T20:43:44Z 2011 2011 Journal Article Cheng, N. S., Nguyen, H. T., Zhao, K., & Tang, X. (2011). Evaluation of Flow Resistance in Smooth Rectangular Open Channels with Modified Prandtl Friction Law. Journal of Hydraulic Engineering, 137(4), 441-450. 0733-9429 https://hdl.handle.net/10356/101741 http://hdl.handle.net/10220/7654 10.1061/(ASCE)HY.1943-7900.0000322 en Journal of hydraulic engineering © 2011 ASCE. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Hydraulic Engineering, American Society of Civil Engineers. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000322]. 38 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Water resources
spellingShingle DRNTU::Engineering::Civil engineering::Water resources
Cheng, Nian-Sheng
Nguyen, Hoai Thanh
Zhao, Kuifeng
Tang, Xiaonan
Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law
description Flow resistance in open channels is usually estimated by applying the approach that is developed originally for pipe flows. Such estimates may be useful for engineering applications but always differ from measurements to some extent. This paper first summarizes empirical approaches that have been proposed in the literature to reconcile the resistance difference. These include various modifications of the pipe friction for applications to rectangular ducts and open channel flows. An improved friction equation is then derived for evaluating flow resistance of smooth rectangular open channels. Comparisons are made with experimental data reported by previous researchers and those collected in the present study. It is shown that the new proposed equation is applicable for both narrow and wide channels and is more accurate than those available in the literature.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Cheng, Nian-Sheng
Nguyen, Hoai Thanh
Zhao, Kuifeng
Tang, Xiaonan
format Article
author Cheng, Nian-Sheng
Nguyen, Hoai Thanh
Zhao, Kuifeng
Tang, Xiaonan
author_sort Cheng, Nian-Sheng
title Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law
title_short Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law
title_full Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law
title_fullStr Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law
title_full_unstemmed Evaluation of flow resistance in smooth rectangular open channels with modified Prandtl friction law
title_sort evaluation of flow resistance in smooth rectangular open channels with modified prandtl friction law
publishDate 2012
url https://hdl.handle.net/10356/101741
http://hdl.handle.net/10220/7654
_version_ 1681042070871998464