Experimental and numerical heat transfer investigation of reverse jet impingement
This project aimed to study heat transfer and flow in double wall aerofoil cooling using two primary studies: a novel jet impingement cooling geometry and a typical film cooling arrangement. Experimental testing with thermochromic liquid crystal validated numerical work using ANSYS Fluent. A novel...
| Main Author: | |
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| Format: | Thesis (University of Nottingham only) |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/74017/ |
| _version_ | 1848800835754000384 |
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| author | Ahmed, Abdallah |
| author_facet | Ahmed, Abdallah |
| author_sort | Ahmed, Abdallah |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | This project aimed to study heat transfer and flow in double wall aerofoil cooling using two primary studies: a novel jet impingement cooling geometry and a typical film cooling arrangement. Experimental testing with thermochromic liquid crystal validated numerical work using ANSYS Fluent.
A novel ‘reverse’ jet impingement geometry was developed to enhance heat transfer performance, comprising of a ‘dimple’ target enclosed within a cylindrical ‘silo’. Experimental variations included Reynolds number range of 10,000 to 70,000, jet-to-target, crossflow condition, and an extended nozzle geometry. An overall enhancement of heat transfer was achieved with the novel geometry, with optimum jet to target spacing found at around 4 jet diameters, and some reduction in crossflow effects were observed.
A numerical investigation validated against experimental data for a novel 'reverse' jet impingement geometry was conducted. Optimizations in jet-to-jet and jet-to-target spacing were found, but no significant optimization of inlet condition was observed. The effect of outlet condition on discharge coefficient was significant, with an optimum nozzle length of 1 jet diameter for heat transfer enhancement. Staggered and inline dimples were shown to provide similar enhancements to heat transfer, significantly compared to a traditional flat plate target.
The study evaluated heat transfer and discharge coefficients in a scaled cylindrical film cooling channel with varied Reynolds number, entry sharpness, inclination, and rotation angle. |
| first_indexed | 2025-11-14T20:57:53Z |
| format | Thesis (University of Nottingham only) |
| id | nottingham-74017 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:57:53Z |
| publishDate | 2023 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-740172023-12-31T04:40:05Z https://eprints.nottingham.ac.uk/74017/ Experimental and numerical heat transfer investigation of reverse jet impingement Ahmed, Abdallah This project aimed to study heat transfer and flow in double wall aerofoil cooling using two primary studies: a novel jet impingement cooling geometry and a typical film cooling arrangement. Experimental testing with thermochromic liquid crystal validated numerical work using ANSYS Fluent. A novel ‘reverse’ jet impingement geometry was developed to enhance heat transfer performance, comprising of a ‘dimple’ target enclosed within a cylindrical ‘silo’. Experimental variations included Reynolds number range of 10,000 to 70,000, jet-to-target, crossflow condition, and an extended nozzle geometry. An overall enhancement of heat transfer was achieved with the novel geometry, with optimum jet to target spacing found at around 4 jet diameters, and some reduction in crossflow effects were observed. A numerical investigation validated against experimental data for a novel 'reverse' jet impingement geometry was conducted. Optimizations in jet-to-jet and jet-to-target spacing were found, but no significant optimization of inlet condition was observed. The effect of outlet condition on discharge coefficient was significant, with an optimum nozzle length of 1 jet diameter for heat transfer enhancement. Staggered and inline dimples were shown to provide similar enhancements to heat transfer, significantly compared to a traditional flat plate target. The study evaluated heat transfer and discharge coefficients in a scaled cylindrical film cooling channel with varied Reynolds number, entry sharpness, inclination, and rotation angle. 2023-12-31 Thesis (University of Nottingham only) NonPeerReviewed application/pdf en cc_by https://eprints.nottingham.ac.uk/74017/1/Abdallah_Thesis_03082023.pdf Ahmed, Abdallah (2023) Experimental and numerical heat transfer investigation of reverse jet impingement. PhD thesis, University of Nottingham. Heat Transfer; Jet Impingement; Transient Liquid Crystal |
| spellingShingle | Heat Transfer; Jet Impingement; Transient Liquid Crystal Ahmed, Abdallah Experimental and numerical heat transfer investigation of reverse jet impingement |
| title | Experimental and numerical heat transfer investigation of reverse jet impingement |
| title_full | Experimental and numerical heat transfer investigation of reverse jet impingement |
| title_fullStr | Experimental and numerical heat transfer investigation of reverse jet impingement |
| title_full_unstemmed | Experimental and numerical heat transfer investigation of reverse jet impingement |
| title_short | Experimental and numerical heat transfer investigation of reverse jet impingement |
| title_sort | experimental and numerical heat transfer investigation of reverse jet impingement |
| topic | Heat Transfer; Jet Impingement; Transient Liquid Crystal |
| url | https://eprints.nottingham.ac.uk/74017/ |