Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows
Using the Yang-Shih low Reynolds k-ε turbulence model, the mean flow field of a turbulent offset jet issuing from a long circular pipe was numerically investigated. The experimental results were used to verify the numerical results such as decay rate of streamwise velocity, locus of maximum streamwi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2016-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=40297&issue_ID=235 |
| _version_ | 1818002379051630592 |
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| author | Negar Mohammad Aliha Hossein Afshin Bijan Farhanieh |
| author_facet | Negar Mohammad Aliha Hossein Afshin Bijan Farhanieh |
| author_sort | Negar Mohammad Aliha |
| collection | DOAJ |
| description | Using the Yang-Shih low Reynolds k-ε turbulence model, the mean flow field of a turbulent offset jet issuing from a long circular pipe was numerically investigated. The experimental results were used to verify the numerical results such as decay rate of streamwise velocity, locus of maximum streamwise velocity, jet half width in the wall normal and lateral directions, and jet velocity profiles. The present study focused attention on the influence of nozzle geometry on the evolution of a 3D incompressible turbulent offset jet. Circular, square-shaped, and rectangular nozzles were considered here. A comparison between the mean flow characteristics of offset jets issuing from circular and square-shaped nozzles, which had equal area and mean exit velocity, were made numerically. Moreover, the effect of aspect ratio of rectangular nozzles on the main features of the flow was investigated. It was shown that the spread rate, flow entrainment, and mixing rate of an offset jet issuing from circular nozzle are lower than square-shaped one. In addition, it was demonstrated that the aspect ratio of the rectangular nozzles only affects the mean flow field of the offset jet in the near field (up to 15 times greater than equivalent diameter of the nozzles). Furthermore, other parameters including the wall shear stress, flow entrainment and the length of potential core were also investigated. |
| first_indexed | 2024-04-14T03:45:07Z |
| format | Article |
| id | doaj.art-6dd90f9beac1479694de9b4ec82995c2 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-04-14T03:45:07Z |
| publishDate | 2016-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-6dd90f9beac1479694de9b4ec82995c22022-12-22T02:14:17ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722016-01-019420832095.Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet FlowsNegar Mohammad Aliha0Hossein Afshin1Bijan Farhanieh2Sharif University of TechnologySharif University of TechnologySchool of Mechanical Engineering, Sharif University of Technology, Tehran, IranUsing the Yang-Shih low Reynolds k-ε turbulence model, the mean flow field of a turbulent offset jet issuing from a long circular pipe was numerically investigated. The experimental results were used to verify the numerical results such as decay rate of streamwise velocity, locus of maximum streamwise velocity, jet half width in the wall normal and lateral directions, and jet velocity profiles. The present study focused attention on the influence of nozzle geometry on the evolution of a 3D incompressible turbulent offset jet. Circular, square-shaped, and rectangular nozzles were considered here. A comparison between the mean flow characteristics of offset jets issuing from circular and square-shaped nozzles, which had equal area and mean exit velocity, were made numerically. Moreover, the effect of aspect ratio of rectangular nozzles on the main features of the flow was investigated. It was shown that the spread rate, flow entrainment, and mixing rate of an offset jet issuing from circular nozzle are lower than square-shaped one. In addition, it was demonstrated that the aspect ratio of the rectangular nozzles only affects the mean flow field of the offset jet in the near field (up to 15 times greater than equivalent diameter of the nozzles). Furthermore, other parameters including the wall shear stress, flow entrainment and the length of potential core were also investigated.http://jafmonline.net/JournalArchive/download?file_ID=40297&issue_ID=2353D offset jet; Numerical simulation; Aspect ratio; Rectangular nozzle; Circular nozzle. |
| spellingShingle | Negar Mohammad Aliha Hossein Afshin Bijan Farhanieh Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows Journal of Applied Fluid Mechanics 3D offset jet; Numerical simulation; Aspect ratio; Rectangular nozzle; Circular nozzle. |
| title | Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows |
| title_full | Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows |
| title_fullStr | Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows |
| title_full_unstemmed | Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows |
| title_short | Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows |
| title_sort | numerical investigation of nozzle geometry effect on turbulent 3 d water offset jet flows |
| topic | 3D offset jet; Numerical simulation; Aspect ratio; Rectangular nozzle; Circular nozzle. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=40297&issue_ID=235 |
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