Effect of tube material on convective heat transfer of various nanofluids

Solangi, K. H. and Sharif, Samane and Nizamani, Bilal (2020) Effect of tube material on convective heat transfer of various nanofluids. Journal of Thermal Analysis and Calorimetry, 140 (1). pp. 63-77. ISSN 1388-6150, DOI https://doi.org/10.1007/s10973-019-08835-z.

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This work presents the convective heat transfer and friction loss characteristics of novel functionalized graphene-based and metal oxide nanofluids. The convective heat transfer in circular tubes of different materials (copper, aluminium and stainless steel 316) was used at constant wall heat flux of 23,870 W m(-2). An innovative approach was used to prepare highly dispersed propylene glycol-treated graphene nanoplatelets-water (GNP1) and trimethylolpropane tris amine-water (GNP2) by functionalization method. The measured thermal conductivity of GNP1 and GNP2 nanofluids showed incredible performance which increased up to 32% and 31% higher than that of basefluid. By comparing material effect, copper tube showed the highest HTC up to 119% in GNP1 at 0.1 mass%, while in aluminium and stainless steel 316 tube the highest heat transfer coefficient (HTC) was 110.2% and 100.68%. Besides, alumina and silicon dioxide nanofluids also presented decent increment in HTC which was up to 29.1% and 31.6%, respectively. The highest rise in friction factor for GNP1 and GNP2 was obtained up to 10.2% and 10%, respectively. For alumina and silicon dioxide nanofluids, the friction factor was measured up to 5.92% and 7.14% at velocity range of 1-3 m s(-1). The maximum enhancement in Nusselt number (Nu) for GNP, GNP2, alumina and silicon dioxide nanofluids was achieved up to 84%, 72%, 26% and 28%. The results suggest that the copper tube which is a good conductor of heat could be used in the heat exchangers and functionalized GNP nanofluids can be used as the heat exchanging fluids in heat transfer applications which could give a decent substitute to traditional working fluids in heat exchangers and in thermal fluid systems.

Item Type: Article
Funders: Research Management Centre of UTM through the RUG [QJ130000.2409.04G39] [QJ130000.2509.16H21]
Uncontrolled Keywords: Nanofluids; Heat transfer; Copper; Aluminium; Stainless steel
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 04 Oct 2023 06:42
Last Modified: 04 Oct 2023 06:42
URI: http://eprints.um.edu.my/id/eprint/36799

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