Heat transfer and entropy generation abilities of MWCNTs/GNPs hybrid nanofluids in microtubes

Autor:	Ahmed A. Hussien, Ebrahim Mahmoudi, Nadiahnor Md Yusop, Wael Al-Kouz, Mohammad Mehrali, Mohd Zulkifly Abdullah
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	Convective flow Materials science 020209 energy General Physics and Astronomy Hybrid nanofluid lcsh:Astrophysics 02 engineering and technology Heat transfer coefficient Article heat transfer coefficient symbols.namesake Nanofluid Thermal lcsh:QB460-466 0202 electrical engineering electronic engineering information engineering MWCNTs lcsh:Science GNPs Heat transfer coeffcient Reynolds number 021001 nanoscience & nanotechnology lcsh:QC1-999 Heat flux Chemical engineering Heat transfer symbols Microtube lcsh:Q 0210 nano-technology Mass fraction lcsh:Physics
Zdroj:	Entropy Volume 21 Issue 5 Entropy, Vol 21, Iss 5, p 480 (2019) Entropy: international and interdisciplinary journal of entropy and information studies, 21(5)
ISSN:	1099-4300
DOI:	10.3390/e21050480
Popis:	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 µ m 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&ndash 0.125 wt.%. The range of the Reynolds number in this experiment was maintained at Re = 200&ndash 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ad2269f91a6f4184e817fcac069282fb https://doi.org/10.3390/e21050480 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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