Investigation of effects of surface texture on ice formation

Superhydrophobic surfaces are one of the focuses in developing new anti-icing techniques in the aerospace industry. Its excellent water repellent performance makes it an appealing application in anti-icing methods. Hence, exploring the relationship between hydrophobicity and icephobic properties cou...

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Main Author: Wang, Qiuping
Other Authors: Chan Weng Kong
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2020
Subjects:
Online Access:https://hdl.handle.net/10356/141028
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1410282023-03-04T19:29:37Z Investigation of effects of surface texture on ice formation Wang, Qiuping Chan Weng Kong School of Mechanical and Aerospace Engineering MWKCHAN@ntu.edu.sg Engineering::Aeronautical engineering::Aircraft Engineering::Aeronautical engineering::Materials of construction Engineering::Mechanical engineering::Fluid mechanics Superhydrophobic surfaces are one of the focuses in developing new anti-icing techniques in the aerospace industry. Its excellent water repellent performance makes it an appealing application in anti-icing methods. Hence, exploring the relationship between hydrophobicity and icephobic properties could be beneficial in developing anti-icing techniques for aerospace industry in the future. In this project, 1100 aluminum alloy is used in this experiment because it is an ideal material used in aircraft’s fan blades, engine cowling, fuel tanks and repairing material for wingtips. They are chemically etched to obtain different contact angles. Based on the previous research, the hydrophobicity of the test plates is affected by the duration of etching and concentration of etchant. The result shows that there is a critical etching duration and etchant concentration beyond which the hydrophobicity would decrease. From the experimental result, a test plate etched with 4M HCL for 5 minutes would obtain an optimal contact angle of 160.57°. Plasma cleaning is employed to achieve a hydrophilic surface, the results show that 10 minutes of plasma cleaning is required to achieve a contact angle of 24.82°. In order to determine the icephobic properties of the test plates at different contact angles, test rig has been set up to allow the icing experiment to be conducted under dynamic airflow conditions. A capacitive sensing method was also employed to analyze the ice formation process. The results show that surfaces with contact angle more than 140° demonstrate a delay in ice formation. A contact angle of 160.57° has shown a longer delay in ice formation. However, other test plates with contact angle less than 140° shows a similar rate of ice formation. It is also observed that the icephobic properties such as delaying ice formation are not directly related to the surface roughness. Bachelor of Engineering (Mechanical Engineering) 2020-06-03T07:57:31Z 2020-06-03T07:57:31Z 2020 Final Year Project (FYP) https://hdl.handle.net/10356/141028 en B065 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Aeronautical engineering::Aircraft
Engineering::Aeronautical engineering::Materials of construction
Engineering::Mechanical engineering::Fluid mechanics
spellingShingle Engineering::Aeronautical engineering::Aircraft
Engineering::Aeronautical engineering::Materials of construction
Engineering::Mechanical engineering::Fluid mechanics
Wang, Qiuping
Investigation of effects of surface texture on ice formation
description Superhydrophobic surfaces are one of the focuses in developing new anti-icing techniques in the aerospace industry. Its excellent water repellent performance makes it an appealing application in anti-icing methods. Hence, exploring the relationship between hydrophobicity and icephobic properties could be beneficial in developing anti-icing techniques for aerospace industry in the future. In this project, 1100 aluminum alloy is used in this experiment because it is an ideal material used in aircraft’s fan blades, engine cowling, fuel tanks and repairing material for wingtips. They are chemically etched to obtain different contact angles. Based on the previous research, the hydrophobicity of the test plates is affected by the duration of etching and concentration of etchant. The result shows that there is a critical etching duration and etchant concentration beyond which the hydrophobicity would decrease. From the experimental result, a test plate etched with 4M HCL for 5 minutes would obtain an optimal contact angle of 160.57°. Plasma cleaning is employed to achieve a hydrophilic surface, the results show that 10 minutes of plasma cleaning is required to achieve a contact angle of 24.82°. In order to determine the icephobic properties of the test plates at different contact angles, test rig has been set up to allow the icing experiment to be conducted under dynamic airflow conditions. A capacitive sensing method was also employed to analyze the ice formation process. The results show that surfaces with contact angle more than 140° demonstrate a delay in ice formation. A contact angle of 160.57° has shown a longer delay in ice formation. However, other test plates with contact angle less than 140° shows a similar rate of ice formation. It is also observed that the icephobic properties such as delaying ice formation are not directly related to the surface roughness.
author2 Chan Weng Kong
author_facet Chan Weng Kong
Wang, Qiuping
format Final Year Project
author Wang, Qiuping
author_sort Wang, Qiuping
title Investigation of effects of surface texture on ice formation
title_short Investigation of effects of surface texture on ice formation
title_full Investigation of effects of surface texture on ice formation
title_fullStr Investigation of effects of surface texture on ice formation
title_full_unstemmed Investigation of effects of surface texture on ice formation
title_sort investigation of effects of surface texture on ice formation
publisher Nanyang Technological University
publishDate 2020
url https://hdl.handle.net/10356/141028
_version_ 1759858277988958208