Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler

Droplet shear stress is the main cause of soil erosion under sprinkler irrigation, and the effect of droplet impact angle on the shear stress distribution cannot be ignored. In this study, a ball-driven sprinkler was selected to investigate the radial distributions of droplet impact angles under thr...

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Autores principales:	Xin Hui, Haijun Yan, Yuncheng Xu, Haibin Tan
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	ball-driven sprinkler droplet impact angle droplet impact velocity droplet shear stress sprinkler irrigation 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/844cd112da214555bfcbc5c51563021e
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spelling	oai:doaj.org-article:844cd112da214555bfcbc5c51563021e2021-11-06T10:07:59ZSprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler1606-97491607-079810.2166/ws.2021.025https://doaj.org/article/844cd112da214555bfcbc5c51563021e2021-09-01T00:00:00Zhttp://ws.iwaponline.com/content/21/6/2772https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Droplet shear stress is the main cause of soil erosion under sprinkler irrigation, and the effect of droplet impact angle on the shear stress distribution cannot be ignored. In this study, a ball-driven sprinkler was selected to investigate the radial distributions of droplet impact angles under three operating pressures (0.25, 0.30, and 0.35 MPa) and two nozzle diameters (1.9 and 2.2 mm), which are commonly used in agricultural irrigation. The effect of droplet impact angles on the distances from the sprinkler, droplet impact velocities, and shear stresses were analyzed by a 2DVD instrument. Irrespective of the nozzle diameter or operating pressure, the droplet velocities and impact angles near the sprinkler were distributed at 1.0–5.5 m s−1 and 70–90°, respectively, and the droplet shear stress increased with the distance from the sprinkler. Suitable operating pressure and distance from the sprinkler significantly reduced the droplet shear stress. Although the nozzle diameter had a certain effect on the maximum shear stress, the overall effect was insignificant. We developed the models for the radial distribution of droplet shear stresses, which were in good agreement with the measurement. This study proposes a new method for accurately predicating the soil erosion under sprinkler irrigation. HIGHLIGHTS The soil erosion risk at the end of the spray jet is highly related to droplet shear stress rather than droplet kinetic energy.; Increasing the operating pressure or decreasing the nozzle diameter can effectively reduce the maximum droplet shear stress.; Mathematical models are developed for predicting the radial distribution of droplet shear stress.;Xin HuiHaijun YanYuncheng XuHaibin TanIWA Publishingarticleball-driven sprinklerdroplet impact angledroplet impact velocitydroplet shear stresssprinkler irrigationWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 6, Pp 2772-2785 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ball-driven sprinkler droplet impact angle droplet impact velocity droplet shear stress sprinkler irrigation Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	ball-driven sprinkler droplet impact angle droplet impact velocity droplet shear stress sprinkler irrigation Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Xin Hui Haijun Yan Yuncheng Xu Haibin Tan Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
description	Droplet shear stress is the main cause of soil erosion under sprinkler irrigation, and the effect of droplet impact angle on the shear stress distribution cannot be ignored. In this study, a ball-driven sprinkler was selected to investigate the radial distributions of droplet impact angles under three operating pressures (0.25, 0.30, and 0.35 MPa) and two nozzle diameters (1.9 and 2.2 mm), which are commonly used in agricultural irrigation. The effect of droplet impact angles on the distances from the sprinkler, droplet impact velocities, and shear stresses were analyzed by a 2DVD instrument. Irrespective of the nozzle diameter or operating pressure, the droplet velocities and impact angles near the sprinkler were distributed at 1.0–5.5 m s−1 and 70–90°, respectively, and the droplet shear stress increased with the distance from the sprinkler. Suitable operating pressure and distance from the sprinkler significantly reduced the droplet shear stress. Although the nozzle diameter had a certain effect on the maximum shear stress, the overall effect was insignificant. We developed the models for the radial distribution of droplet shear stresses, which were in good agreement with the measurement. This study proposes a new method for accurately predicating the soil erosion under sprinkler irrigation. HIGHLIGHTS The soil erosion risk at the end of the spray jet is highly related to droplet shear stress rather than droplet kinetic energy.; Increasing the operating pressure or decreasing the nozzle diameter can effectively reduce the maximum droplet shear stress.; Mathematical models are developed for predicting the radial distribution of droplet shear stress.;
format	article
author	Xin Hui Haijun Yan Yuncheng Xu Haibin Tan
author_facet	Xin Hui Haijun Yan Yuncheng Xu Haibin Tan
author_sort	Xin Hui
title	Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
title_short	Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
title_full	Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
title_fullStr	Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
title_full_unstemmed	Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
title_sort	sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/844cd112da214555bfcbc5c51563021e
work_keys_str_mv	AT xinhui sprinklerdropletimpactangleaffectsshearstressdistributiononsoilsurfaceacasestudyofaballdrivensprinkler AT haijunyan sprinklerdropletimpactangleaffectsshearstressdistributiononsoilsurfaceacasestudyofaballdrivensprinkler AT yunchengxu sprinklerdropletimpactangleaffectsshearstressdistributiononsoilsurfaceacasestudyofaballdrivensprinkler AT haibintan sprinklerdropletimpactangleaffectsshearstressdistributiononsoilsurfaceacasestudyofaballdrivensprinkler
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Sprinkler droplet impact angle affects shear stress distribution on soil surface – a case study of a ball-driven sprinkler

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