Determination of shear velocity in a mild-sloping open channel flow
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Autónoma Chapingo
2018
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| _version_ | 1876450530567389184 |
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| author | Ángel Mendoza-González |
| author_facet | Ángel Mendoza-González |
| contents | Determination of shear velocity in a mild-sloping open channel flow Ángel Mendoza-González Ariosto Aguilar-Chávez Multidisciplinaria (Ciencias Naturales y Exactas) log law Shear stress acoustic Doppler velocimetry Objective: To present a methodology that allows experimentally determining shear velocity, considering the log-law as a model of velocity distribution in the outer region of turbulent flow. Mathodology: The experimental study was carried out in a rectangular-shaped, variably-sloped channel with a 0.245-m-wide base and 5 m long. Flow velocity was measured with an Acoustic Doppler Velocimeter (ADV), and the measurement area was 12 mm. Shear velocity was determined by the instantaneous velocity equation (javax.xml.bind.JAXBElement@17e547). Results: The log-law model had a good statistical fit with the shear velocity estimated from the experimental data.Study limitations: The experimental tests were conducted only in subcritical regime with low aspect ratios. In addition, in all tests, the measurement of instantaneous velocities was carried out only in a 12-mm profile, as close as possible to the wall.Originality: The model to calculate the shear velocity is presented explicitly, and the statisticalapproach employed supports the use of the median as an estimator of the shear velocity.Conclusions: The presented methodology shows low uncertainty in the estimation of shear velocity. The Anderson-Darling test showed that the results do not follow a normal distribution, so the median is the statistical parameter to define the shear velocity value. 2018 artículo científico 2007-3925 https://www.redalyc.org/articulo.oa?id=688672142001 https://www.redalyc.org/journal/6886/688672142001/ https://www.redalyc.org/journal/6886/688672142001/html/ https://www.redalyc.org/journal/6886/688672142001/688672142001.epub https://www.redalyc.org/journal/6886/688672142001/movil 10.5154/r.inagbi.2017.01.002 en http://www.redalyc.org/revista.oa?id=6886 Ingeniería agrícola y biosistemas application/pdf Universidad Autónoma Chapingo Ingeniería agrícola y biosistemas (México) Num.1 Vol.10 |
| format | Artículo científico |
| id | redalyc_688672142001 |
| institution | Redalyc |
| language | en |
| publishDate | 2018 |
| publisher | Universidad Autónoma Chapingo |
| spellingShingle | Determination of shear velocity in a mild-sloping open channel flow Ángel Mendoza-González Multidisciplinaria (Ciencias Naturales y Exactas) log law Shear stress acoustic Doppler velocimetry Determination of shear velocity in a mild-sloping open channel flow Ángel Mendoza-González Ariosto Aguilar-Chávez Multidisciplinaria (Ciencias Naturales y Exactas) log law Shear stress acoustic Doppler velocimetry Objective: To present a methodology that allows experimentally determining shear velocity, considering the log-law as a model of velocity distribution in the outer region of turbulent flow. Mathodology: The experimental study was carried out in a rectangular-shaped, variably-sloped channel with a 0.245-m-wide base and 5 m long. Flow velocity was measured with an Acoustic Doppler Velocimeter (ADV), and the measurement area was 12 mm. Shear velocity was determined by the instantaneous velocity equation (javax.xml.bind.JAXBElement@17e547). Results: The log-law model had a good statistical fit with the shear velocity estimated from the experimental data.Study limitations: The experimental tests were conducted only in subcritical regime with low aspect ratios. In addition, in all tests, the measurement of instantaneous velocities was carried out only in a 12-mm profile, as close as possible to the wall.Originality: The model to calculate the shear velocity is presented explicitly, and the statisticalapproach employed supports the use of the median as an estimator of the shear velocity.Conclusions: The presented methodology shows low uncertainty in the estimation of shear velocity. The Anderson-Darling test showed that the results do not follow a normal distribution, so the median is the statistical parameter to define the shear velocity value. 2018 artículo científico 2007-3925 https://www.redalyc.org/articulo.oa?id=688672142001 https://www.redalyc.org/journal/6886/688672142001/ https://www.redalyc.org/journal/6886/688672142001/html/ https://www.redalyc.org/journal/6886/688672142001/688672142001.epub https://www.redalyc.org/journal/6886/688672142001/movil 10.5154/r.inagbi.2017.01.002 en http://www.redalyc.org/revista.oa?id=6886 Ingeniería agrícola y biosistemas application/pdf Universidad Autónoma Chapingo Ingeniería agrícola y biosistemas (México) Num.1 Vol.10 |
| title | Determination of shear velocity in a mild-sloping open channel flow |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) log law Shear stress acoustic Doppler velocimetry |
| url | https://www.redalyc.org/articulo.oa?id=688672142001 https://www.redalyc.org/journal/6886/688672142001/ https://www.redalyc.org/journal/6886/688672142001/html/ https://www.redalyc.org/journal/6886/688672142001/688672142001.epub https://www.redalyc.org/journal/6886/688672142001/movil |