Study of heat transfer properties of nanofluids

The development of nanotechnology has led to the creation of nanofluids. Nanofluids are stabilised mixtures consisting of solid particles (in nano sizes) that are being well dispersed and suspended in base fluids. Being a stable mixture, there were reports of improved thermal properties of the nanof...

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Main Author: Ong, Wu Jie.
Other Authors: Leong Kai Choong
Format: Final Year Project (FYP)
Language:English
Published: 2009
Subjects:
Online Access:http://hdl.handle.net/10356/16868
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author Ong, Wu Jie.
author2 Leong Kai Choong
author_facet Leong Kai Choong
Ong, Wu Jie.
author_sort Ong, Wu Jie.
collection NTU
description The development of nanotechnology has led to the creation of nanofluids. Nanofluids are stabilised mixtures consisting of solid particles (in nano sizes) that are being well dispersed and suspended in base fluids. Being a stable mixture, there were reports of improved thermal properties of the nanofluid. Having the potential to replace existing conventional cooling methods in industrial applications, numerous experiments were conducted. However, conflicting results were reported. Also, the heat mechanisms attributed to the enhanced thermal properties of the nanofluid remain ambiguous despite some models were derived. This report investigates the thermal properties of gold nanofluids using the transient single-wire technique for measuring the thermal conductivity of the nanofluids. The investigation will take into consideration of the volume concentration which is believed to be a factor influencing the thermal properties of the nanofluid. Judging from the experimental results on the thermal conductivity values of different gold nanofluids, there are significant enhancements. For gold nanofluid samples with relatively small volume concentrations of 0.000545% and 0.00109%, there are enhancements of 4.9% and 11.4% respectively at a temperature of 20°C. The most significant enhancement recorded is 12.7% for the gold nanofluid sample which has a small volume concentration of 0.00029% Au, with Poly(vinylpyrrolidone) in water (i.e. aqueous solution) as its base fluid. From the measured readings on the viscosity of nanofluids, it show that viscosity value of the nanofluids increases as the volume ratio of the nanoparticles in the fluid rises Although it is desired to have a larger thermal conductivity value by having a larger volume ratio of nanoparticles to facilitate heat transfer, one has to also take into consideration the viscosity value since the nanofluids get more viscous with larger volume ratio, which could be undesirable for the fluids to flow in channels or pipes for heat transfer.
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spelling ntu-10356/168682023-03-04T18:53:12Z Study of heat transfer properties of nanofluids Ong, Wu Jie. Leong Kai Choong Yang Chun, Charles School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering The development of nanotechnology has led to the creation of nanofluids. Nanofluids are stabilised mixtures consisting of solid particles (in nano sizes) that are being well dispersed and suspended in base fluids. Being a stable mixture, there were reports of improved thermal properties of the nanofluid. Having the potential to replace existing conventional cooling methods in industrial applications, numerous experiments were conducted. However, conflicting results were reported. Also, the heat mechanisms attributed to the enhanced thermal properties of the nanofluid remain ambiguous despite some models were derived. This report investigates the thermal properties of gold nanofluids using the transient single-wire technique for measuring the thermal conductivity of the nanofluids. The investigation will take into consideration of the volume concentration which is believed to be a factor influencing the thermal properties of the nanofluid. Judging from the experimental results on the thermal conductivity values of different gold nanofluids, there are significant enhancements. For gold nanofluid samples with relatively small volume concentrations of 0.000545% and 0.00109%, there are enhancements of 4.9% and 11.4% respectively at a temperature of 20°C. The most significant enhancement recorded is 12.7% for the gold nanofluid sample which has a small volume concentration of 0.00029% Au, with Poly(vinylpyrrolidone) in water (i.e. aqueous solution) as its base fluid. From the measured readings on the viscosity of nanofluids, it show that viscosity value of the nanofluids increases as the volume ratio of the nanoparticles in the fluid rises Although it is desired to have a larger thermal conductivity value by having a larger volume ratio of nanoparticles to facilitate heat transfer, one has to also take into consideration the viscosity value since the nanofluids get more viscous with larger volume ratio, which could be undesirable for the fluids to flow in channels or pipes for heat transfer. Bachelor of Engineering (Mechanical Engineering) 2009-05-28T08:10:38Z 2009-05-28T08:10:38Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/16868 en Nanyang Technological University 70 p. application/pdf
spellingShingle DRNTU::Engineering::Mechanical engineering
Ong, Wu Jie.
Study of heat transfer properties of nanofluids
title Study of heat transfer properties of nanofluids
title_full Study of heat transfer properties of nanofluids
title_fullStr Study of heat transfer properties of nanofluids
title_full_unstemmed Study of heat transfer properties of nanofluids
title_short Study of heat transfer properties of nanofluids
title_sort study of heat transfer properties of nanofluids
topic DRNTU::Engineering::Mechanical engineering
url http://hdl.handle.net/10356/16868
work_keys_str_mv AT ongwujie studyofheattransferpropertiesofnanofluids