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Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes

1
Department of Mechanical Engineering, Faculty of Engineering, Al-Hussein Bin Talal University, P.O. Box 20, Ma’an, Jordan
2
School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia
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Faculty of Chemical Engineering, Jalan Ilmu 1/1, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia
4
Mechatronics Engineering Department, German Jordanian University, Amman 11180, Jordan
5
Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor Darul Ehsan, Malaysia
6
Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
*
Authors to whom correspondence should be addressed.
Entropy 2019, 21(5), 480; https://doi.org/10.3390/e21050480
Received: 17 March 2019 / Revised: 4 April 2019 / Accepted: 13 April 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Entropy Production in Turbulent Flow)
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Abstract

Massive improvements in the thermophysical properties of nanofluids over conventional fluids have led to the rapid evolution of using multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) in the field of heat transfer. In this study, the heat transfer and entropy generation abilities of MWCNTs/GNPs hybrid nanofluids were explored. Experiments on forced convective flow through a brass microtube with 300 µm inner diameter and 0.27 m in length were performed under uniform heat flux. MWCNTs/GNPs hybrid nanofluids were developed by adding 0.035 wt.% GNPs to MWCNTs water-based nanofluids with mass fractions of 0.075–0.125 wt.%. The range of the Reynolds number in this experiment was maintained at Re = 200–500. Results showed that the conventional approach for predicting the heat transfer coefficient was applicable for microtubes. The heat transfer coefficient increased markedly with the use of MWCNTs and MWCNTs/GNPs nanofluids, with increased pressure dropping by 12.4%. Results further showed a reduction by 37.5% in the total entropy generation rate in microtubes for hybrid nanofluids. Overall, MWCNTs/GNPs hybrid nanofluids can be used as alternative fluids in cooling systems for thermal applications. View Full-Text
Keywords: MWCNTs; GNPs; hybrid nanofluid; microtube; heat transfer coefficient MWCNTs; GNPs; hybrid nanofluid; microtube; heat transfer coefficient
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hussien, A.A.; Abdullah, M.Z.; Yusop, N.M.; Al-Kouz, W.; Mahmoudi, E.; Mehrali, M. Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes. Entropy 2019, 21, 480.

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