Examination of Reynolds number effect on the development of round jet flow

In this study, the Reynolds number effect on the development of round jet flow is presented. The jet is produced from a smoothly contracting round nozzle and the flow structure is controlled by varying the air blower speed in order to obtain various Reynolds numbers (Re). The flow Reynolds number co...

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Autores principales:	Olanrewaju Miracle Oyewola, Adebunmi Okediji, Olusegun Olufemi Ajide, Muyiwa Samuel Adaramola
Formato:	article
Lenguaje:	EN
Publicado:	Scientific Route OÜ 2021
Materias:	centerline velocity jet half-width potential core reynolds number round jet Mechanical engineering and machinery TJ1-1570 Physics QC1-999
Acceso en línea:	https://doaj.org/article/d150937644484b6e965f152b169f5c0a
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id	oai:doaj.org-article:d150937644484b6e965f152b169f5c0a
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spelling	oai:doaj.org-article:d150937644484b6e965f152b169f5c0a2021-11-19T13:32:07ZExamination of Reynolds number effect on the development of round jet flow2461-42542461-426210.21303/2461-4262.2021.001872https://doaj.org/article/d150937644484b6e965f152b169f5c0a2021-11-01T00:00:00Zhttp://journal.eu-jr.eu/engineering/article/view/1872https://doaj.org/toc/2461-4254https://doaj.org/toc/2461-4262In this study, the Reynolds number effect on the development of round jet flow is presented. The jet is produced from a smoothly contracting round nozzle and the flow structure is controlled by varying the air blower speed in order to obtain various Reynolds numbers (Re). The flow Reynolds number considered varies between 1140 and 9117. Mean velocity measurements were taken using hot-wire probe at different axial and lateral distances (0≤x/d≤50, where x is the downstream distance and d is the nozzle diameter) for the jet flow and at for 0≤x/d≤30 in long pipe attached to the nozzle. Measurements reveal that Reynolds number dictate the potential core length such that the higher the Reynolds number, the lower the potential core which is a measure of mixing of jet and ambient fluid. It shows that further away from the jet exit section, potential core decreases as Reynolds number increases, the velocity profile has a top hat shape very close to the nozzle exit and the shape is independent of Reynolds number. It is found that potential core extends up to x/d=8 for Reynolds number of 1140 as against conventional near field 0≤x/d≤6. This may suggest effect of very low Reynolds number. However, further investigation is required to ascertain this at extremely low Reynolds numbers. It is also observed that further away from the jet exit section, the higher the downstream distance, the higher the jet half-width (R1/2). Furthermore, the flow in the pipe shows almost constant value of normalised axial centerline velocity for a longer distance and this clearly indicates that there is mass redistribution rather than entrainment of ambient fluid. Overall, the Reynolds number controls the magnitude rather than the wavelength of the oscillationOlanrewaju Miracle OyewolaAdebunmi OkedijiOlusegun Olufemi AjideMuyiwa Samuel AdaramolaScientific Route OÜarticlecenterline velocityjet half-widthpotential corereynolds numberround jetMechanical engineering and machineryTJ1-1570PhysicsQC1-999ENEUREKA: Physics and Engineering, Iss 6, Pp 39-47 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	centerline velocity jet half-width potential core reynolds number round jet Mechanical engineering and machinery TJ1-1570 Physics QC1-999
spellingShingle	centerline velocity jet half-width potential core reynolds number round jet Mechanical engineering and machinery TJ1-1570 Physics QC1-999 Olanrewaju Miracle Oyewola Adebunmi Okediji Olusegun Olufemi Ajide Muyiwa Samuel Adaramola Examination of Reynolds number effect on the development of round jet flow
description	In this study, the Reynolds number effect on the development of round jet flow is presented. The jet is produced from a smoothly contracting round nozzle and the flow structure is controlled by varying the air blower speed in order to obtain various Reynolds numbers (Re). The flow Reynolds number considered varies between 1140 and 9117. Mean velocity measurements were taken using hot-wire probe at different axial and lateral distances (0≤x/d≤50, where x is the downstream distance and d is the nozzle diameter) for the jet flow and at for 0≤x/d≤30 in long pipe attached to the nozzle. Measurements reveal that Reynolds number dictate the potential core length such that the higher the Reynolds number, the lower the potential core which is a measure of mixing of jet and ambient fluid. It shows that further away from the jet exit section, potential core decreases as Reynolds number increases, the velocity profile has a top hat shape very close to the nozzle exit and the shape is independent of Reynolds number. It is found that potential core extends up to x/d=8 for Reynolds number of 1140 as against conventional near field 0≤x/d≤6. This may suggest effect of very low Reynolds number. However, further investigation is required to ascertain this at extremely low Reynolds numbers. It is also observed that further away from the jet exit section, the higher the downstream distance, the higher the jet half-width (R1/2). Furthermore, the flow in the pipe shows almost constant value of normalised axial centerline velocity for a longer distance and this clearly indicates that there is mass redistribution rather than entrainment of ambient fluid. Overall, the Reynolds number controls the magnitude rather than the wavelength of the oscillation
format	article
author	Olanrewaju Miracle Oyewola Adebunmi Okediji Olusegun Olufemi Ajide Muyiwa Samuel Adaramola
author_facet	Olanrewaju Miracle Oyewola Adebunmi Okediji Olusegun Olufemi Ajide Muyiwa Samuel Adaramola
author_sort	Olanrewaju Miracle Oyewola
title	Examination of Reynolds number effect on the development of round jet flow
title_short	Examination of Reynolds number effect on the development of round jet flow
title_full	Examination of Reynolds number effect on the development of round jet flow
title_fullStr	Examination of Reynolds number effect on the development of round jet flow
title_full_unstemmed	Examination of Reynolds number effect on the development of round jet flow
title_sort	examination of reynolds number effect on the development of round jet flow
publisher	Scientific Route OÜ
publishDate	2021
url	https://doaj.org/article/d150937644484b6e965f152b169f5c0a
work_keys_str_mv	AT olanrewajumiracleoyewola examinationofreynoldsnumbereffectonthedevelopmentofroundjetflow AT adebunmiokediji examinationofreynoldsnumbereffectonthedevelopmentofroundjetflow AT olusegunolufemiajide examinationofreynoldsnumbereffectonthedevelopmentofroundjetflow AT muyiwasamueladaramola examinationofreynoldsnumbereffectonthedevelopmentofroundjetflow
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Examination of Reynolds number effect on the development of round jet flow

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