Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium

Nanotechnology has introduce nanofluids as suspension of nanoparticles in the base fluids. The nanoparticles dispersion in fluids due to thermal properties limitation. Hence, inclusion of MWCNT-OH nanoparticles and PVP in base fluids could enhance the thermal properties and the nanofluids stability....

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Main Author: Abdullah, Amirah
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Published: 2019
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Abdullah, Amirah
Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium
description Nanotechnology has introduce nanofluids as suspension of nanoparticles in the base fluids. The nanoparticles dispersion in fluids due to thermal properties limitation. Hence, inclusion of MWCNT-OH nanoparticles and PVP in base fluids could enhance the thermal properties and the nanofluids stability. Futhermore, the low boiling point and high freezing point of deionized water has causes another problem and be solve by mixed this fluid with ethylene glycol which act as antifreeze fluid. Intention of this research are to investigate the nanofluid dispersion and stability and as well as thermal properties performance. The two-step method is used in formulazation of nanofluid on concentration 0.1 wt% to 1.0 wt% of MWCNT-OH and base fluid deionized water to ethylene glycol ratio is 0:100%, 100:0%, 90:10%, 80:20%, 70:30%, 60:40% and 50:50%. The dispersion process has selected 5 minutes dispersion process as the optimum time in getting better dispersion and stability of nanofluids. The nanofluids has been tested at 6°C, 25°C and 40°C in thermal conductivity and heat transfer coefficient test. In thermal conductivity test, addition of MWCNT-OH in deionized water is the highest thermal conductivity enhancement which 21.21% (0.4 wt%) at 40°C. However, the thermal conductivity decrement also happens on deionized water based nanofluids at range concentration 0.3 wt% and 0.5 wt% till 1.0 wt% at 40°C. Moreover, the thermal conductivity results is fluctuated or inconsistent with increment of temperature and concentration. Hence, it mean thermal conductivity is independent on temperature and concentration. Meanwhile, heat transfer coefficient is increases with increment of temperature and nanoparticles concentration. The highest enhancement of heat transfer coefficient is occurs on ratio 70:30;DI:EG which has 104.3% at 40°C and 1.0 wt%. The overall increment of heat transfer coefficient occurs on 1.0 wt% and 40°C. Only on 0:100; DI:EG, and 60:40; DI EG has the highest enhancement on 25°C. Besides, ethylene glycol based nanofluids has high heat transfer coefficient on 6°C.In specific heat test, addition of MWCNT-OH has decreased the specific heat exclude on 0.8 wt% of ethylene glycol based nanofluids. This test is conducted in room temperature. Based on these results, concentration, nanoparticles properties and coagulation in nanofluids causes specific heat decrement. Whilst, surface energy, nanoparticles size and area are contributed in high specific heat. To sum up, seeding of MWCNT-OH in fluids has enhanced the thermal properties on certain concentration and temperature.
format Thesis
qualification_name Master of Philosophy (M.Phil.)
qualification_level Master's degree
author Abdullah, Amirah
author_facet Abdullah, Amirah
author_sort Abdullah, Amirah
title Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium
title_short Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium
title_full Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium
title_fullStr Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium
title_full_unstemmed Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium
title_sort stability and thermal properties of hydroxyl multiwalled carbon nanotubes in different medium
granting_institution Universiti Teknikal Malaysia Melaka
granting_department Faculty Of Mechanical Engineering
publishDate 2019
url http://eprints.utem.edu.my/id/eprint/24670/1/Stability%20And%20Thermal%20Properties%20Of%20Hydroxyl%20Multiwalled%20Carbon%20Nanotubes%20In%20Different%20Medium.pdf
http://eprints.utem.edu.my/id/eprint/24670/2/Stability%20And%20Thermal%20Properties%20Of%20Hydroxyl%20Multiwalled%20Carbon%20Nanotubes%20In%20Different%20Medium.pdf
_version_ 1747834084214702080
spelling my-utem-ep.246702021-10-05T11:17:16Z Stability And Thermal Properties Of Hydroxyl Multiwalled Carbon Nanotubes In Different Medium 2019 Abdullah, Amirah T Technology (General) TA Engineering (General). Civil engineering (General) Nanotechnology has introduce nanofluids as suspension of nanoparticles in the base fluids. The nanoparticles dispersion in fluids due to thermal properties limitation. Hence, inclusion of MWCNT-OH nanoparticles and PVP in base fluids could enhance the thermal properties and the nanofluids stability. Futhermore, the low boiling point and high freezing point of deionized water has causes another problem and be solve by mixed this fluid with ethylene glycol which act as antifreeze fluid. Intention of this research are to investigate the nanofluid dispersion and stability and as well as thermal properties performance. The two-step method is used in formulazation of nanofluid on concentration 0.1 wt% to 1.0 wt% of MWCNT-OH and base fluid deionized water to ethylene glycol ratio is 0:100%, 100:0%, 90:10%, 80:20%, 70:30%, 60:40% and 50:50%. The dispersion process has selected 5 minutes dispersion process as the optimum time in getting better dispersion and stability of nanofluids. The nanofluids has been tested at 6°C, 25°C and 40°C in thermal conductivity and heat transfer coefficient test. In thermal conductivity test, addition of MWCNT-OH in deionized water is the highest thermal conductivity enhancement which 21.21% (0.4 wt%) at 40°C. However, the thermal conductivity decrement also happens on deionized water based nanofluids at range concentration 0.3 wt% and 0.5 wt% till 1.0 wt% at 40°C. Moreover, the thermal conductivity results is fluctuated or inconsistent with increment of temperature and concentration. Hence, it mean thermal conductivity is independent on temperature and concentration. Meanwhile, heat transfer coefficient is increases with increment of temperature and nanoparticles concentration. The highest enhancement of heat transfer coefficient is occurs on ratio 70:30;DI:EG which has 104.3% at 40°C and 1.0 wt%. The overall increment of heat transfer coefficient occurs on 1.0 wt% and 40°C. Only on 0:100; DI:EG, and 60:40; DI EG has the highest enhancement on 25°C. Besides, ethylene glycol based nanofluids has high heat transfer coefficient on 6°C.In specific heat test, addition of MWCNT-OH has decreased the specific heat exclude on 0.8 wt% of ethylene glycol based nanofluids. This test is conducted in room temperature. Based on these results, concentration, nanoparticles properties and coagulation in nanofluids causes specific heat decrement. Whilst, surface energy, nanoparticles size and area are contributed in high specific heat. To sum up, seeding of MWCNT-OH in fluids has enhanced the thermal properties on certain concentration and temperature. 2019 Thesis http://eprints.utem.edu.my/id/eprint/24670/ http://eprints.utem.edu.my/id/eprint/24670/1/Stability%20And%20Thermal%20Properties%20Of%20Hydroxyl%20Multiwalled%20Carbon%20Nanotubes%20In%20Different%20Medium.pdf text en public http://eprints.utem.edu.my/id/eprint/24670/2/Stability%20And%20Thermal%20Properties%20Of%20Hydroxyl%20Multiwalled%20Carbon%20Nanotubes%20In%20Different%20Medium.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=116897 mphil masters Universiti Teknikal Malaysia Melaka Faculty Of Mechanical Engineering Mohamad, Imran Syakir 1. Abbasi, S., Zebarjad, S.M., NoieBaghban, S.H., Youseffi, A., and Ekrami-Kakhki, M.S., 2015. Thermal Conductivity of Water Based Nanofluids Containing Decorated Multi Walled Carbon Nanotubes with Different Amount of TiO2 Nanoparticles. Iranian Journal of Chemical Engineering, 12(1), pp. 30-40. 2. Abdolbaqi, M.K., Azwadi, C.S.N., Mamat, R., Azmi, W.H., and Najafi, G.N., 2015. Nanofluids Heat Transfer Enhancement Through Straight Channel Under Turbulent Flow. International Journal of Automotive and Mechanical Engineering, 11, pp. 2294-2305. 3. Abdul Hamid, K., Azmi, W.H., Mamat, R., Usri, N.A., Najafi, G., 2015. Effect of Temperature on Heat Transfer Coefficient of Titanium Dioxide in Ethylene Glycol-Based Nanofluid. Journal of Mechanical Engineering and Sciences, 8, pp. 1367-1375. 4. Abdullah, A., Mohamad, I. S., Bani Hashim, A. Y., Abdullah, N., Wei, P.B., Isa, M.H. and Zainal Abidin, S., 2016. Thermal Conductivity and Viscosity of Deionized water and Ethylene Glycol-based Nanofluids. Journal of Mechanical Engineering and Sciences, 10(3), pp. 2249- 2261. 5. Abreu, B., Lamas, B., Fonseca, A., Martins, N., and Oliveira, M.S.A., 2014. 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