Investigation of flow over superhydrophobic surfaces
In this study, the effects of three important parameters were investigated by subjecting superhydrophobic AZ91D alloy through a pressure-driven fluid flow within the laminar flow regime and submerging the alloy underwater for 2 days in a test chamber. These parameters are the wetting behaviour, the...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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Nanyang Technological University
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/150043 |
| _version_ | 1826120473970212864 |
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| author | Lim, Arnold WeiYu |
| author2 | Chan Weng Kong |
| author_facet | Chan Weng Kong Lim, Arnold WeiYu |
| author_sort | Lim, Arnold WeiYu |
| collection | NTU |
| description | In this study, the effects of three important parameters were investigated by subjecting superhydrophobic AZ91D alloy through a pressure-driven fluid flow within the laminar flow regime and submerging the alloy underwater for 2 days in a test chamber. These parameters are the wetting behaviour, the drag-reducing property and the wetting transition of the superhydrophobic surfaces. Superhydrophobic AZ91D surfaces can be fabricated using a 2-step chemical etching technique with the exact optimum condition found. It was found that superhydrophobic surfaces were able to significantly reduce the drag experienced by 60% at low Re (<831) and 44% at higher Re (>1000). The drag-reducing property was found to deteriorate by 10% in the presence of accelerating fluid flow and submerging underwater for a day. This percentage would increase 3 to 4 times after the second day. The contact angle of the superhydrophobic surface was found to drop by 5% at the end of the second day. All these indicate an exchange between the trapped air and liquid on the textured surfaces which show a transition of wetting behaviour from the Cassie-Baxter model to the Wenzel model. |
| first_indexed | 2024-10-01T05:17:03Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/150043 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:17:03Z |
| publishDate | 2021 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1500432021-05-24T03:29:54Z Investigation of flow over superhydrophobic surfaces Lim, Arnold WeiYu Chan Weng Kong School of Mechanical and Aerospace Engineering MWKCHAN@ntu.edu.sg Engineering::Mechanical engineering::Fluid mechanics Engineering::Aeronautical engineering In this study, the effects of three important parameters were investigated by subjecting superhydrophobic AZ91D alloy through a pressure-driven fluid flow within the laminar flow regime and submerging the alloy underwater for 2 days in a test chamber. These parameters are the wetting behaviour, the drag-reducing property and the wetting transition of the superhydrophobic surfaces. Superhydrophobic AZ91D surfaces can be fabricated using a 2-step chemical etching technique with the exact optimum condition found. It was found that superhydrophobic surfaces were able to significantly reduce the drag experienced by 60% at low Re (<831) and 44% at higher Re (>1000). The drag-reducing property was found to deteriorate by 10% in the presence of accelerating fluid flow and submerging underwater for a day. This percentage would increase 3 to 4 times after the second day. The contact angle of the superhydrophobic surface was found to drop by 5% at the end of the second day. All these indicate an exchange between the trapped air and liquid on the textured surfaces which show a transition of wetting behaviour from the Cassie-Baxter model to the Wenzel model. Bachelor of Engineering (Aerospace Engineering) 2021-05-24T03:29:54Z 2021-05-24T03:29:54Z 2021 Final Year Project (FYP) Lim, A. W. (2021). Investigation of flow over superhydrophobic surfaces. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/150043 https://hdl.handle.net/10356/150043 en B033 application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Mechanical engineering::Fluid mechanics Engineering::Aeronautical engineering Lim, Arnold WeiYu Investigation of flow over superhydrophobic surfaces |
| title | Investigation of flow over superhydrophobic surfaces |
| title_full | Investigation of flow over superhydrophobic surfaces |
| title_fullStr | Investigation of flow over superhydrophobic surfaces |
| title_full_unstemmed | Investigation of flow over superhydrophobic surfaces |
| title_short | Investigation of flow over superhydrophobic surfaces |
| title_sort | investigation of flow over superhydrophobic surfaces |
| topic | Engineering::Mechanical engineering::Fluid mechanics Engineering::Aeronautical engineering |
| url | https://hdl.handle.net/10356/150043 |
| work_keys_str_mv | AT limarnoldweiyu investigationofflowoversuperhydrophobicsurfaces |