Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants

Conventional coolants such as water, oil and ethylene glycol are commonly used in thermal systems. However, they offered poor thermal characteristics such as low thermal conductivity. The developments in nanotechnology have introduced heat transfer fluids with improved thermal conductivity known as...

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Main Author:	Mohd Hanafi, Nurfadhillah
Format:	Thesis
Language:	English English
Published:	2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://ir.upnm.edu.my/id/eprint/441/1/INVESTIGATION%20OF%20THERMAL%20%2825p%29.pdf http://ir.upnm.edu.my/id/eprint/441/2/INVESTIGATION%20OF%20THERMAL%20%28Full%29.pdf
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spelling	my-upnm-ir.4412024-05-07T08:07:43Z Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants 2014-12-01 Mohd Hanafi, Nurfadhillah TJ Mechanical engineering and machinery Conventional coolants such as water, oil and ethylene glycol are commonly used in thermal systems. However, they offered poor thermal characteristics such as low thermal conductivity. The developments in nanotechnology have introduced heat transfer fluids with improved thermal conductivity known as nanofluids. Addition of highly conductive particles like MWCNT can increase the thermal conductivity of heat-transfer fluids. Therefore, the objectives of this study are investigation on thermal conductivity and viscosity characteristics of MWCNT based water/ethylene glycol nanofluid. Apart from that the stability of nanoluids was measured via observation and zeta potential methods. KD2-Pro thermal analyser and Brookfield R/S rheometer were used to measure the thermal conductivity and viscosity of the samples, respectively. Based on observation method, the particle sedimentation and coagulation occurred at 0.01 wt. % and 0.05 wt. % of MWCNT. However, the nanofluids samples remained stable when added with surfactants namely GA, PVP, and CTAB. This experimental result concluded that sample added with 0.01 wt. % of MWCNT and CTAB exhibited highest zeta potential value compared to that of other type of surfactants. The thermal conductivity increases up to 18.4% for PVP, 25.67 % for GA and lastly 16.03% for CTAB for 0.05 wt. % of MWCNT based nanofluid compared to that of base fluid. The viscosity results indicated that for high particle content, the nanofluids behaved as shear-thinning. Finally, statistical mathematical equations were developed for thermal conductivity and viscosity of MWCNT based nanofluids in the present study. 2014-12 Thesis http://ir.upnm.edu.my/id/eprint/441/ http://ir.upnm.edu.my/id/eprint/441/1/INVESTIGATION%20OF%20THERMAL%20%2825p%29.pdf text en public http://ir.upnm.edu.my/id/eprint/441/2/INVESTIGATION%20OF%20THERMAL%20%28Full%29.pdf text en validuser mphil masters Universiti Pertahanan Nasional Malaysia Centre For Graduate Studies
institution	Universiti Pertahanan Nasional Malaysia
collection	UPNM Institutional Repository
language	English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Mohd Hanafi, Nurfadhillah Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
description	Conventional coolants such as water, oil and ethylene glycol are commonly used in thermal systems. However, they offered poor thermal characteristics such as low thermal conductivity. The developments in nanotechnology have introduced heat transfer fluids with improved thermal conductivity known as nanofluids. Addition of highly conductive particles like MWCNT can increase the thermal conductivity of heat-transfer fluids. Therefore, the objectives of this study are investigation on thermal conductivity and viscosity characteristics of MWCNT based water/ethylene glycol nanofluid. Apart from that the stability of nanoluids was measured via observation and zeta potential methods. KD2-Pro thermal analyser and Brookfield R/S rheometer were used to measure the thermal conductivity and viscosity of the samples, respectively. Based on observation method, the particle sedimentation and coagulation occurred at 0.01 wt. % and 0.05 wt. % of MWCNT. However, the nanofluids samples remained stable when added with surfactants namely GA, PVP, and CTAB. This experimental result concluded that sample added with 0.01 wt. % of MWCNT and CTAB exhibited highest zeta potential value compared to that of other type of surfactants. The thermal conductivity increases up to 18.4% for PVP, 25.67 % for GA and lastly 16.03% for CTAB for 0.05 wt. % of MWCNT based nanofluid compared to that of base fluid. The viscosity results indicated that for high particle content, the nanofluids behaved as shear-thinning. Finally, statistical mathematical equations were developed for thermal conductivity and viscosity of MWCNT based nanofluids in the present study.
format	Thesis
qualification_name	Master of Philosophy (MPhil)
qualification_level	Master's degree
author	Mohd Hanafi, Nurfadhillah
author_facet	Mohd Hanafi, Nurfadhillah
author_sort	Mohd Hanafi, Nurfadhillah
title	Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
title_short	Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
title_full	Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
title_fullStr	Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
title_full_unstemmed	Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
title_sort	investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants
granting_institution	Universiti Pertahanan Nasional Malaysia
granting_department	Centre For Graduate Studies
publishDate	2014
url	http://ir.upnm.edu.my/id/eprint/441/1/INVESTIGATION%20OF%20THERMAL%20%2825p%29.pdf http://ir.upnm.edu.my/id/eprint/441/2/INVESTIGATION%20OF%20THERMAL%20%28Full%29.pdf
_version_	1813223602551521280

Investigation of thermal conductivity and viscosity of nanofluids containing carbon nanotube and surfactants

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