Investigation of surface effects on ice formation
The accumulation of ice can cause disasters in aircrafts. It can occur when aircraft are on the ground and in the flight. The methods, such as the use mechanical tools, apply hot water, and use infrared heating, are only applicable to certain situations. Therefore, to fully prevent accidents t...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | |
| التنسيق: | Final Year Project |
| اللغة: | English |
| منشور في: |
Nanyang Technological University
2022
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://hdl.handle.net/10356/158723 |
| الوسوم: |
إضافة وسم
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| الملخص: | The accumulation of ice can cause disasters in aircrafts. It can occur when aircraft are
on the ground and in the flight. The methods, such as the use mechanical tools, apply
hot water, and use infrared heating, are only applicable to certain situations. Therefore,
to fully prevent accidents to occur due to ice formation, it is necessary and important
to investigate the relationship between hydrophobic surfaces and anti-icing properties.
One of the most effective methods in fabricating hydrophobic surfaces is chemical
etching.
The 6061 Aluminium Alloy is used in this project to simulate an aircraft surface as it
is easy to be welded and manipulated. Besides that, it is also very light and fairly strong,
which makes it ideal for aircraft wings. In this study, they were chemically etched by
using Sodium Hydroxide (NaOH) as etchant and to obtain different contact angles.
The project consists of preliminary experiment (without submersion), 1st submersion
(30mins), 2nd submersion (30mins) and 3rd submersion (1hr).
Preliminary experiments were conducted to obtain the critical etching duration and
etchant concentration that will produce the ideal hydrophobic surface. Next, the
submersion experiment was carried out to simulate the condition when there is a rain
before and after the aircraft took off. These samples will be submerged for 3 durations
of: a) 30min; b) 30min; c) 1 hr, which is used to determine if the superhydrophobic
properties is still present after submersion. Lastly, an experiment was designed to
measure the time from starting of the ice formation to complete freezing.
From the results that were obtained from above experiments, the critical etching
duration and etchant concentration is 2M NaOH for 2.5 min & 0.5M NaOH for 6 min
which produced a contact angle of 161.85°. This test plate produced the largest contact
angle of 161.85° and had the slowest ice formation time of 512 sec. However, the ice
formation time decreased after each submersion, and the time decreased to 354 sec
after all submersion experiments. |
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