Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media

High heat flux removal is one of the major challenges in designing for the future electronic devices. The trend to address these high heat fluxes is to introduce microchannel arrays directly in the heat generating by the electronic component. Commonly, water is suggested to be used as a single-phase...

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Main Author:	Zainal Abidin, Syazwani
Format:	Thesis
Language:	English English
Published:	2019
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utem.edu.my/id/eprint/24662/1/Thermophysical%20Properties%20Of%20CNF-Based%20Nanocoolant%20As%20A%20Heat%20Transfer%20Media.pdf http://eprints.utem.edu.my/id/eprint/24662/2/Thermophysical%20Properties%20Of%20CNF-Based%20Nanocoolant%20As%20A%20Heat%20Transfer%20Media.pdf
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institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Zainal Abidin, Syazwani Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media
description	High heat flux removal is one of the major challenges in designing for the future electronic devices. The trend to address these high heat fluxes is to introduce microchannel arrays directly in the heat generating by the electronic component. Commonly, water is suggested to be used as a single-phase coolant in combination with the microchannel heat sinks for cooling of electronics applications. However, one of the major problems faced by the existing coolants is the limited amount of heat that can be absorbed by the fluids. An innovative way to overcome this limitation is by utilizing a nanocoolant as the heat transfer medium in a cooling application. This research was aimed at formulating an efficient nanocoolant from PR-24 HHT carbon nanofibers (CNF) in a base fluid consisting of deionized water (DI) and ethylene glycol (EG). The dispersion of nanofibers was enhanced by the presence of polyvinylpyrrolidone (PVP) as the stabilizing agent through two-step preparation process. The experiment was conducted by setting the variable weight percentage of CNF from 0.1wt% to 1.0wt%, with the base fluid ratio range from 100:0 (DI:EG) to 0:100 (DI:EG). The characterization testing was performed to study the surface species of the nanofiber using nitrogen gas adsorption technique, fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). The detailed study of the thermophysical properties such as thermal conductivity, viscosity, and specific heat capacity of stable CNF-based nanocoolant was also been investigated at three different temperatures (6°C, 25°C and 40°C). The maximum thermal conductivity enhancement of 29.95% was noticed for the nanocoolant with 0.6wt% at 0:100 (DI:EG). The rheological analysis showed that when the temperature increases, the viscosity diminishes. Whereas, due to a lower specific heat of the CNF, the specific heat of the nanocoolant decreased in proportion with the CNF concentration. Experimental investigations into the forced convective heat transfer performance of the CNF-based nanocoolant in a laminar flow through a mini heat transfer test rig showed that the presence of nanoparticles enhanced the heat transfer coefficient as opposed to the original base fluid. The highest heat transfer coefficient was reported with 30:70 (DI:EG) by the 0.7wt% nanocoolant at 40°C with the value of 265.28 x 103 W/m2.K. The enhancement of the heat transfer coefficient was due to the higher thermal conductivity value. The Nusselt number was also calculated and presented in this research. Overall, this study shows that the CNF-based nanocoolant has a huge potential to replace existing coolants in electronic cooling applications. Thus, in order to commercialize nanocoolant in practice, more fundamental studies are needed to understand the crucial parameters that affect their thermal characteristics.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Zainal Abidin, Syazwani
author_facet	Zainal Abidin, Syazwani
author_sort	Zainal Abidin, Syazwani
title	Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media
title_short	Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media
title_full	Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media
title_fullStr	Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media
title_full_unstemmed	Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media
title_sort	thermophysical properties of cnf-based nanocoolant as a heat transfer media
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty of Mechanical Engineering
publishDate	2019
url	http://eprints.utem.edu.my/id/eprint/24662/1/Thermophysical%20Properties%20Of%20CNF-Based%20Nanocoolant%20As%20A%20Heat%20Transfer%20Media.pdf http://eprints.utem.edu.my/id/eprint/24662/2/Thermophysical%20Properties%20Of%20CNF-Based%20Nanocoolant%20As%20A%20Heat%20Transfer%20Media.pdf
_version_	1747834082111258624
spelling	my-utem-ep.246622021-10-05T12:24:49Z Thermophysical Properties Of CNF-Based Nanocoolant As A Heat Transfer Media 2019 Zainal Abidin, Syazwani TJ Mechanical engineering and machinery High heat flux removal is one of the major challenges in designing for the future electronic devices. The trend to address these high heat fluxes is to introduce microchannel arrays directly in the heat generating by the electronic component. Commonly, water is suggested to be used as a single-phase coolant in combination with the microchannel heat sinks for cooling of electronics applications. However, one of the major problems faced by the existing coolants is the limited amount of heat that can be absorbed by the fluids. An innovative way to overcome this limitation is by utilizing a nanocoolant as the heat transfer medium in a cooling application. This research was aimed at formulating an efficient nanocoolant from PR-24 HHT carbon nanofibers (CNF) in a base fluid consisting of deionized water (DI) and ethylene glycol (EG). The dispersion of nanofibers was enhanced by the presence of polyvinylpyrrolidone (PVP) as the stabilizing agent through two-step preparation process. The experiment was conducted by setting the variable weight percentage of CNF from 0.1wt% to 1.0wt%, with the base fluid ratio range from 100:0 (DI:EG) to 0:100 (DI:EG). The characterization testing was performed to study the surface species of the nanofiber using nitrogen gas adsorption technique, fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). The detailed study of the thermophysical properties such as thermal conductivity, viscosity, and specific heat capacity of stable CNF-based nanocoolant was also been investigated at three different temperatures (6°C, 25°C and 40°C). The maximum thermal conductivity enhancement of 29.95% was noticed for the nanocoolant with 0.6wt% at 0:100 (DI:EG). The rheological analysis showed that when the temperature increases, the viscosity diminishes. Whereas, due to a lower specific heat of the CNF, the specific heat of the nanocoolant decreased in proportion with the CNF concentration. Experimental investigations into the forced convective heat transfer performance of the CNF-based nanocoolant in a laminar flow through a mini heat transfer test rig showed that the presence of nanoparticles enhanced the heat transfer coefficient as opposed to the original base fluid. The highest heat transfer coefficient was reported with 30:70 (DI:EG) by the 0.7wt% nanocoolant at 40°C with the value of 265.28 x 103 W/m2.K. The enhancement of the heat transfer coefficient was due to the higher thermal conductivity value. The Nusselt number was also calculated and presented in this research. Overall, this study shows that the CNF-based nanocoolant has a huge potential to replace existing coolants in electronic cooling applications. Thus, in order to commercialize nanocoolant in practice, more fundamental studies are needed to understand the crucial parameters that affect their thermal characteristics. 2019 Thesis http://eprints.utem.edu.my/id/eprint/24662/ http://eprints.utem.edu.my/id/eprint/24662/1/Thermophysical%20Properties%20Of%20CNF-Based%20Nanocoolant%20As%20A%20Heat%20Transfer%20Media.pdf text en public http://eprints.utem.edu.my/id/eprint/24662/2/Thermophysical%20Properties%20Of%20CNF-Based%20Nanocoolant%20As%20A%20Heat%20Transfer%20Media.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=116899 mphil masters Universiti Teknikal Malaysia Melaka Faculty of Mechanical Engineering 1. Abdul Hamid, K., Azmi, W.H., Mamat, R. and Usri, N.A., 2016. 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