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

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 abiliti...

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Autores principales: Hussien, Ahmed A., Abdullah, Mohd Z., Yusop, Nadiahnor Md, Al-Kouz, Wael, Mahmoudi, Ebrahim, Mehrali, Mohammad
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7514969/
https://www.ncbi.nlm.nih.gov/pubmed/33267194
http://dx.doi.org/10.3390/e21050480
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author Hussien, Ahmed A.
Abdullah, Mohd Z.
Yusop, Nadiahnor Md
Al-Kouz, Wael
Mahmoudi, Ebrahim
Mehrali, Mohammad
author_facet Hussien, Ahmed A.
Abdullah, Mohd Z.
Yusop, Nadiahnor Md
Al-Kouz, Wael
Mahmoudi, Ebrahim
Mehrali, Mohammad
author_sort Hussien, Ahmed A.
collection PubMed
description 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.
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spelling pubmed-75149692020-11-09 Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes Hussien, Ahmed A. Abdullah, Mohd Z. Yusop, Nadiahnor Md Al-Kouz, Wael Mahmoudi, Ebrahim Mehrali, Mohammad Entropy (Basel) Article 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. MDPI 2019-05-09 /pmc/articles/PMC7514969/ /pubmed/33267194 http://dx.doi.org/10.3390/e21050480 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hussien, Ahmed A.
Abdullah, Mohd Z.
Yusop, Nadiahnor Md
Al-Kouz, Wael
Mahmoudi, Ebrahim
Mehrali, Mohammad
Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes
title Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes
title_full Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes
title_fullStr Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes
title_full_unstemmed Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes
title_short Heat Transfer and Entropy Generation Abilities of MWCNTs/GNPs Hybrid Nanofluids in Microtubes
title_sort heat transfer and entropy generation abilities of mwcnts/gnps hybrid nanofluids in microtubes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7514969/
https://www.ncbi.nlm.nih.gov/pubmed/33267194
http://dx.doi.org/10.3390/e21050480
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