Reinvestigation on Mixing Length in an Open Channel Turbulent Flow

Kundu, S.; Kumbhakar, M.; Ghoshal, K.

doi:10.1007/s11600-017-0109-7

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Artykuł - szczegóły

Czasopismo

Acta Geophysica

2018 | Vol. 66, no. 1 | 93--107

Tytuł artykułu

Reinvestigation on Mixing Length in an Open Channel Turbulent Flow

Autorzy

Kundu, S. , Kumbhakar, M. , Ghoshal, K.

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Warianty tytułu

Języki publikacji

Abstrakty

The present study proposes a model on vertical distribution of streamwise velocity in an open channel turbulent flow through a newly proposed mixing length, which is derived for both clear water and sedimentladen turbulent flows. The analysis is based on a theoretical consideration which explores the effect of density stratification on the streamwise velocity profile. The derivation of mixing length makes use of the diffusion equation where both the sediment diffusivity and momentum diffusivity are taken as a function of height from the channel bed. The damping factor present in the mixing length of sediment-fluid mixture contains velocity and concentration gradients. This factor is capable of describing the dip-phenomenon of velocity distribution. From the existing experimental data of velocity, the mixing length data are calculated. The pattern shows that mixing length increases from bed to the dip-position, having a larger value at dip-position and then decreases up to the water surface with a zero value thereat. The present model agrees well with these data sets and this behavior cannot be described by any other existing model. Finally, the proposed mixing length model is applied to find the velocity distribution in wide and narrow open channels.The derived velocity distribution is compared with laboratory channel data of velocity, and the comparison shows good agreement.

Słowa kluczowe

szybkość opadania droga mieszania kanał otwarty

settling velocity mixing length open channel flow velocity-dip-phenomenon sediment and momentum diffusivity

Wydawca

Czasopismo

Acta Geophysica

Rocznik

2018

Tom

Vol. 66, no. 1

Strony

93--107

Opis fizyczny

Bibliogr. 67 poz.

Twórcy

autor

Kundu, S.

Department of Basic Sciences and Humanities, IIIT Bhubaneswar, Bhubaneswar, India

autor

Kumbhakar, M.

Department of Mathematics, Indian Institute of Technology, Kharagpur, India, manotosh.kumbhakar@gmail.com

autor

Ghoshal, K.

Department of Mathematics, Indian Institute of Technology, Kharagpur, India

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018)

Typ dokumentu

Bibliografia

Identyfikatory

DOI

10.1007/s11600-017-0109-7

Identyfikator YADDA

bwmeta1.element.baztech-c7598c3a-3d99-4e9b-9ca4-fc265f597780