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Experimental investigation and development of new correlations for heat transfer enhancement and friction factor of BioGlycol/water based TiO2 nanofluids in flat tubes

Abdolbaqi, Mohammed Khdher and R., Mamat and Nor Azwadi, Che Sidik and Azmi, W. H. and Selvakumar, P. (2017) Experimental investigation and development of new correlations for heat transfer enhancement and friction factor of BioGlycol/water based TiO2 nanofluids in flat tubes. International Journal of Heat and Mass Transfer, 108. pp. 1026-1035. ISSN 0017-9310

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Abstract

Nanofluids, as a kind of new engineering material consisting of nanometre-sized additives and base fluids, have gained extensive attention due to their role in improving the efficiency of thermal systems. This paper presents an experimental investigation on the heat transfer coefficient and friction factor of BioGlycol/water based TiO2 nanofluids flowing in a flat tube under turbulent flow conditions. TiO2 nanoparticles with average diameters of 50 nm dispersed in BioGlycol/water of 20:80% mixture ratio respectively with volume concentrations of 0.5–2 vol.% were used as the working fluid. Moreover, this investigation was carried out at operating temperatures of 30, 50 and 70 °C and under constant heat flux boundary conditions. The results showed that the Nusselt number of nanofluid is higher than that of the base liquid and increased with the increasing of the Reynolds number and operating temperatures. The Nusselt number of nanofluids was approximately 28.2% greater than that of base fluid and the results also showed that the Nusselt number of the nanofluids at a volume concentration of 2.0 vol.% was approximately 3% lower than that of base fluids for certain conditions. For the friction factor, the results show that the friction factor of nanofluids at 1.0 vol.% was approximately 6.1% higher than the base fluid and increases with the increase of volume concentrations to be 14.3% at 2.0 vol.% higher than the base fluid. Finally, the new correlations were proposed for predicting the Nusselt number and friction factor of the nanofluids with maximum deviation of 10% and 3% respectively.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Nanofluids; BioGlycol; Titanium oxide; Heat transfer; Friction factor
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Centre of Excellence: Automotive Engineering Centre
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 25 Apr 2017 04:37
Last Modified: 08 Aug 2018 02:46
URI: http://umpir.ump.edu.my/id/eprint/16324
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