Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder
The Coanda effect is a tendency of flowing fluid to follow the solid surface rather than to separate under the inertial effect. This paper presents the effects of surface curvature on the Coanda angle and jet deflection for a vertical jet impacting a horizontal cylinder (of diameter D) with Froude n...
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2023-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2175_d313d41a97d43e7dd1cc201a23cf2a11.pdf |
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| author | M. Nausin M. Seerwani M. M. Alam |
| author_facet | M. Nausin M. Seerwani M. M. Alam |
| author_sort | M. Nausin |
| collection | DOAJ |
| description | The Coanda effect is a tendency of flowing fluid to follow the solid surface rather than to separate under the inertial effect. This paper presents the effects of surface curvature on the Coanda angle and jet deflection for a vertical jet impacting a horizontal cylinder (of diameter D) with Froude numbers Fr = 4.74 and 6.33. The penetration depth h of the cylinder in the jet is varied from h/D = 0.01-0.4 while the jet-to-cylinder diameter ratio d/D is varied from 0.11 to 2.0. For Fr = 4.74, the round jet impacting the cylinder evolves into a planar jet for d/D £ 0.40 where the jet deflection is positive, dictated by the Coanda effect. The deflection of the jet is negative for d/D = 0.60 and 0.83 where the bouncing (inertial) effect overwhelms the Coanda effect. Fr = 4.74, the jet deflects in the positive direction, regardless of d/D. With increasing h/D or decreasing d/D, both deflection and Coanda angles monotonically increase. An intermittent switch of the jet from one side of the cylinder to the other is observed for certain curvature of the cylinder, ascribed to the competition between bouncing and Coanda effects. |
| first_indexed | 2024-04-10T17:04:34Z |
| format | Article |
| id | doaj.art-dec695188ff74629979eb7098168cd5e |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-04-10T17:04:34Z |
| publishDate | 2023-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-dec695188ff74629979eb7098168cd5e2023-02-06T07:55:54ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452023-01-0116471772310.47176/jafm.16.04.15812175Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal CylinderM. Nausin0M. Seerwani1M. M. Alam2Shen Wai International School (SWIS), 29 Baishi Third Road, Nanshan, Shenzhen, ChinaShen Wai International School (SWIS), 29 Baishi Third Road, Nanshan, Shenzhen, ChinaHarbin Institute of Technology (Shenzhen), Shenzhen 518055, ChinaThe Coanda effect is a tendency of flowing fluid to follow the solid surface rather than to separate under the inertial effect. This paper presents the effects of surface curvature on the Coanda angle and jet deflection for a vertical jet impacting a horizontal cylinder (of diameter D) with Froude numbers Fr = 4.74 and 6.33. The penetration depth h of the cylinder in the jet is varied from h/D = 0.01-0.4 while the jet-to-cylinder diameter ratio d/D is varied from 0.11 to 2.0. For Fr = 4.74, the round jet impacting the cylinder evolves into a planar jet for d/D £ 0.40 where the jet deflection is positive, dictated by the Coanda effect. The deflection of the jet is negative for d/D = 0.60 and 0.83 where the bouncing (inertial) effect overwhelms the Coanda effect. Fr = 4.74, the jet deflects in the positive direction, regardless of d/D. With increasing h/D or decreasing d/D, both deflection and Coanda angles monotonically increase. An intermittent switch of the jet from one side of the cylinder to the other is observed for certain curvature of the cylinder, ascribed to the competition between bouncing and Coanda effects.https://www.jafmonline.net/article_2175_d313d41a97d43e7dd1cc201a23cf2a11.pdfcoanda effectjetcylinderbouncing effectcurvature |
| spellingShingle | M. Nausin M. Seerwani M. M. Alam Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder Journal of Applied Fluid Mechanics coanda effect jet cylinder bouncing effect curvature |
| title | Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder |
| title_full | Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder |
| title_fullStr | Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder |
| title_full_unstemmed | Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder |
| title_short | Influence of Surface Curvature on Coanda Effect for Vertical Jet Impacting Horizontal Cylinder |
| title_sort | influence of surface curvature on coanda effect for vertical jet impacting horizontal cylinder |
| topic | coanda effect jet cylinder bouncing effect curvature |
| url | https://www.jafmonline.net/article_2175_d313d41a97d43e7dd1cc201a23cf2a11.pdf |
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