Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop

The horizontal screen is one of the energy dissipater structures used on the brink of vertical drop. These structures increase the energy dissipation and the turbulence in the flow by causing air entrainment. In the present study, the effect of the diameter of the screen with constant porosity at th...

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Autores principales:	Rasoul Daneshfaraz, Amir Ghaderi, Silvia Di Francesco, Navid Khajei
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	air entrainment energy loss mixing length screen diameter vertical drop Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/7581a6d4d6b24e68bde1f50714e69f9f
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id	oai:doaj.org-article:7581a6d4d6b24e68bde1f50714e69f9f
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spelling	oai:doaj.org-article:7581a6d4d6b24e68bde1f50714e69f9f2021-11-06T07:19:27ZExperimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop1606-97491607-079810.2166/ws.2021.077https://doaj.org/article/7581a6d4d6b24e68bde1f50714e69f9f2021-08-01T00:00:00Zhttp://ws.iwaponline.com/content/21/5/2425https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798The horizontal screen is one of the energy dissipater structures used on the brink of vertical drop. These structures increase the energy dissipation and the turbulence in the flow by causing air entrainment. In the present study, the effect of the diameter of the screen with constant porosity at three different diameters on the hydraulic parameters of the vertical drop was investigated. The experiments were performed in the relative critical depth range of 0.13 to 0.39. The results showed that by increasing the relative diameter of the horizontal screen, the relative wetting length and turbulence length increased, the residual energy remained constant and the pool depth decreased. Compared to the stilling basin, the horizontal screen significantly reduces turbulence length and residual energy. The results also showed that the application of horizontal screens at the brink of the drop, with and without a downstream rough bed, could be a suitable alternative for a stilling basin. HIGHLIGHTS The horizontal screen is one of the energy dissipator structures used on the brink of vertical drop and increases the energy dissipation and the turbulence in the flow by causing air entrainment.; The diameter of the screen holes plays a role in increasing the mixing length.; Vertical drop equipped with a horizontal screen reduces the residual relative energy by 30% compared to the stilling basin.;Rasoul DaneshfarazAmir GhaderiSilvia Di FrancescoNavid KhajeiIWA Publishingarticleair entrainmentenergy lossmixing lengthscreen diametervertical dropWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 5, Pp 2425-2436 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	air entrainment energy loss mixing length screen diameter vertical drop Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	air entrainment energy loss mixing length screen diameter vertical drop Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Rasoul Daneshfaraz Amir Ghaderi Silvia Di Francesco Navid Khajei Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
description	The horizontal screen is one of the energy dissipater structures used on the brink of vertical drop. These structures increase the energy dissipation and the turbulence in the flow by causing air entrainment. In the present study, the effect of the diameter of the screen with constant porosity at three different diameters on the hydraulic parameters of the vertical drop was investigated. The experiments were performed in the relative critical depth range of 0.13 to 0.39. The results showed that by increasing the relative diameter of the horizontal screen, the relative wetting length and turbulence length increased, the residual energy remained constant and the pool depth decreased. Compared to the stilling basin, the horizontal screen significantly reduces turbulence length and residual energy. The results also showed that the application of horizontal screens at the brink of the drop, with and without a downstream rough bed, could be a suitable alternative for a stilling basin. HIGHLIGHTS The horizontal screen is one of the energy dissipator structures used on the brink of vertical drop and increases the energy dissipation and the turbulence in the flow by causing air entrainment.; The diameter of the screen holes plays a role in increasing the mixing length.; Vertical drop equipped with a horizontal screen reduces the residual relative energy by 30% compared to the stilling basin.;
format	article
author	Rasoul Daneshfaraz Amir Ghaderi Silvia Di Francesco Navid Khajei
author_facet	Rasoul Daneshfaraz Amir Ghaderi Silvia Di Francesco Navid Khajei
author_sort	Rasoul Daneshfaraz
title	Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
title_short	Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
title_full	Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
title_fullStr	Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
title_full_unstemmed	Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
title_sort	experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/7581a6d4d6b24e68bde1f50714e69f9f
work_keys_str_mv	AT rasouldaneshfaraz experimentalstudyoftheeffectofhorizontalscreendiameteronhydraulicparametersofverticaldrop AT amirghaderi experimentalstudyoftheeffectofhorizontalscreendiameteronhydraulicparametersofverticaldrop AT silviadifrancesco experimentalstudyoftheeffectofhorizontalscreendiameteronhydraulicparametersofverticaldrop AT navidkhajei experimentalstudyoftheeffectofhorizontalscreendiameteronhydraulicparametersofverticaldrop
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Experimental study of the effect of horizontal screen diameter on hydraulic parameters of vertical drop

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