Dip Phenomenon in High-Curved Turbulent Flows and Application of Entropy Theory

Donatella Termini, Tommaso Moramarco

Risultato della ricerca: Articlepeer review

8 Citazioni (Scopus)

Abstract

The estimation of velocity profile in turbulent open channels is a difficult task due to the significant effects of the secondary flow. The present paper investigates the mechanism of the velocity-dip phenomenon, whereby the location of the maximum velocity appears to be below the free surface. Previous studies conducted in straight channels relate the mechanism of the velocity-dip phenomenon to secondary flow induced by anisotropy of turbulence. This work focuses on high-curved channels where the secondary motion, which is also induced by the channel’s curvature, evolves along the bend. The width-to-depth ratio, B/h, is one of the most important parameters that are affecting the secondary motion entity. In particular, the present study aims to investigatetheevolutionofthevelocity-dipalongthebendfortwovaluesofthewidth-to-depthratio andtheapplicabilityoftheentropicmodelforthedip-phenomenonestimation. Theresultsshowthat the velocity-dip is more accentuated for low values of the width-to-depth ratio, where the secondary motion plays a fundamental role in the distribution of the downstream flow velocity, although the velocity-dip is also present when the aspect ratio is higher than 10. Furthermore, the velocity profiles that were estimated by applying the entropic model are in good agreement with the measured ones, especially for B/h < 10.
Lingua originaleEnglish
pagine (da-a)306-315
Numero di pagine10
RivistaWATER
Volume10
Stato di pubblicazionePublished - 2018

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Geography, Planning and Development
  • Aquatic Science
  • Water Science and Technology

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