Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid

The thermal conductivity (k), heat transfer coefficient (HTC) and viscosity of the ethylene glycol/water dispersed with graphite nanoparticles was studied under heating and cooling conditions for temperatures ranging from 0 °C to 75 °C using tubular heat exchanger system built in house. Flow rate wa...

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Main Authors:	Deshmukh, Vaibhav N., Radhakrishnan, S., Kulkarni, R. R.
Format:	Article
Language:	English
Published:	American Scientific Publishers 2017
Subjects:	T Technology (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/20426/ http://umpir.ump.edu.my/id/eprint/20426/ http://umpir.ump.edu.my/id/eprint/20426/ http://umpir.ump.edu.my/id/eprint/20426/1/ftech-2017-kulkarni-Investigations%20on%20Thermal%20Conductivity1.pdf

id	ump-20426
recordtype	eprints
spelling	ump-204262018-09-27T08:30:10Z http://umpir.ump.edu.my/id/eprint/20426/ Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid Deshmukh, Vaibhav N. Radhakrishnan, S. Kulkarni, R. R. T Technology (General) The thermal conductivity (k), heat transfer coefficient (HTC) and viscosity of the ethylene glycol/water dispersed with graphite nanoparticles was studied under heating and cooling conditions for temperatures ranging from 0 °C to 75 °C using tubular heat exchanger system built in house. Flow rate was varied from 5 l/h to 25 l/h giving Reynolds number (Re) ranging from 50 to 750. The HTC increased with the increase of Re as well as temperature. The thermal conductivity of the nanofluid was determined at constant low Re (200) for all concentrations and temperatures used in the experiment. The concentration dependence of thermal conductivity was found to be much different than that predicted by models suggested in literature. The viscosity was measured for different concentrations of nanoparticles (0 to 0.8%) as well as temperatures 275 K to 340 K. The temperature dependence of viscosity was found to follow Arrhenius type equation η = η o exp(E/kbT) with very little change in the activation energy from that of the base fluid. On the other hand the pre-exponential constant increased six folds with the increase in nanoparticle concentration. An empirical relation derived from Brownian motion was found between the product of viscosity and thermal conductivity (Ω = kr · η r ) with respect to concentration of the nanoparticles which was found to be true for whole range of temperature and compositions studied. American Scientific Publishers 2017 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/20426/1/ftech-2017-kulkarni-Investigations%20on%20Thermal%20Conductivity1.pdf Deshmukh, Vaibhav N. and Radhakrishnan, S. and Kulkarni, R. R. (2017) Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid. Journal of Nanofluids, 6 (6). pp. 1008-1016. ISSN 2169-432X (Print); 2169-4338 (Online) https://doi.org/10.1166/jon.2017.1394 doi: 10.1166/jon.2017.1394
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	T Technology (General)
spellingShingle	T Technology (General) Deshmukh, Vaibhav N. Radhakrishnan, S. Kulkarni, R. R. Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid
description	The thermal conductivity (k), heat transfer coefficient (HTC) and viscosity of the ethylene glycol/water dispersed with graphite nanoparticles was studied under heating and cooling conditions for temperatures ranging from 0 °C to 75 °C using tubular heat exchanger system built in house. Flow rate was varied from 5 l/h to 25 l/h giving Reynolds number (Re) ranging from 50 to 750. The HTC increased with the increase of Re as well as temperature. The thermal conductivity of the nanofluid was determined at constant low Re (200) for all concentrations and temperatures used in the experiment. The concentration dependence of thermal conductivity was found to be much different than that predicted by models suggested in literature. The viscosity was measured for different concentrations of nanoparticles (0 to 0.8%) as well as temperatures 275 K to 340 K. The temperature dependence of viscosity was found to follow Arrhenius type equation η = η o exp(E/kbT) with very little change in the activation energy from that of the base fluid. On the other hand the pre-exponential constant increased six folds with the increase in nanoparticle concentration. An empirical relation derived from Brownian motion was found between the product of viscosity and thermal conductivity (Ω = kr · η r ) with respect to concentration of the nanoparticles which was found to be true for whole range of temperature and compositions studied.
format	Article
author	Deshmukh, Vaibhav N. Radhakrishnan, S. Kulkarni, R. R.
author_facet	Deshmukh, Vaibhav N. Radhakrishnan, S. Kulkarni, R. R.
author_sort	Deshmukh, Vaibhav N.
title	Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid
title_short	Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid
title_full	Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid
title_fullStr	Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid
title_full_unstemmed	Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid
title_sort	investigations on thermal conductivity, heat transfer coefficient and viscosity of graphite nanoparticle dispersed nanofluid
publisher	American Scientific Publishers
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/20426/ http://umpir.ump.edu.my/id/eprint/20426/ http://umpir.ump.edu.my/id/eprint/20426/ http://umpir.ump.edu.my/id/eprint/20426/1/ftech-2017-kulkarni-Investigations%20on%20Thermal%20Conductivity1.pdf
first_indexed	2023-09-18T22:29:26Z
last_indexed	2023-09-18T22:29:26Z
_version_	1777416186264289280

Investigations on Thermal Conductivity, Heat Transfer Coefficient and Viscosity of Graphite Nanoparticle Dispersed Nanofluid

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