Entropy generation analysis of nanofluid flow in a circular tube subjected to constant wall temperature

Leong, K.Y. and Saidur, Rahman and Mahlia, T.M.I. and Yau, Y.H. (2012) Entropy generation analysis of nanofluid flow in a circular tube subjected to constant wall temperature. International Communications in Heat and Mass Transfer, 39 (8). pp. 1169-1175. ISSN 0735-1933

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Abstract

Due to their improved thermal conductivity, nanofluids have the potential to be used as heat transfer fluids in thermal systems. However adding particles into nanofluids will increase the viscosity of the fluid flow. This demonstrates that there is a trade-off between heat transfer enhancement and viscosity. It might not be ideal to achieve a heat transfer enhancement along with a relatively high pumping power. This study presents an analytical investigation on the entropy generation of a nanofluid flow through a circular tube with a constant wall temperature. Nanofluid thermo-physical properties are obtained from literature or calculated from suitable correlations. The present study focuses on water based alumina and titanium dioxide nanofluids. Outcome of the analysis shows that titanium dioxide nanofluids offer lower total dimensionless entropy generation compared to that of alumina nanofluids. Addition of 4 titanium dioxide nanoparticles reduces the total dimensionless entropy generation by 9.7 as compared to only 6.4 reduction observed when using alumina. It is also noted that dimension configurations of the circular tube play a significant role in determining the entropy generation.

Item Type: Article
Additional Information: 011EJ Times Cited:0 Cited References Count:31
Uncontrolled Keywords: Nanofluids, entropy generation, constant wall temperature, convective heat-transfer, thermal-conductivity, laminar-flow, natural-convection, forced-convection, duct, enclosure, viscosity, design.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 03 Jul 2013 03:44
Last Modified: 25 Oct 2019 06:25
URI: http://eprints.um.edu.my/id/eprint/6554

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