Heat transfer enhancement for combined convection flow of nanofluids in a vertical rectangular duct considering radiation effects

Mohammed, H.A. and Om, N.I. and Shuaib, N.H. and Saidur, Rahman (2011) Heat transfer enhancement for combined convection flow of nanofluids in a vertical rectangular duct considering radiation effects. Heat Transfer - Asian Research, 40 (5). pp. 448-463. ISSN 10992871

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Abstract

In this paper, combined convective heat transfer and nanofluids flow characteristics in a vertical rectangular duct are numerically investigated. This investigation covers Rayleigh numbers in the range of 2 × 106 ≤ Ra ≤ 2 × 107 and Reynolds numbers in the range of 200 ≤ Re ≤ 1000. Pure water and five different types of nanofluids such as Ag, Au, CuO, diamond, and SiO2 with a volume fraction range of 0.5% ≤ φ ≤ 3% are used. The three-dimensional steady, laminar flow, and heat transfer governing equations are solved using finite volume method (FVM). The effects of Rayleigh number, Reynolds number, nanofluids type, nanoparticle volume fraction of nano- fluids, and effect of radiation on the thermal and flow fields are examined. It is found that the heat transfer is enhanced using nanofluids by 47% when compared with water. The Nusselt number increases as the Reynolds number and Rayleigh number increase and aspect ratio decreases. A SiO2 nanofluid has the highest Nusselt number and highest wall shear stress while the Au nanofluid has the lowest Nusselt number and lowest wall shear stress. The results also revealed that the wall shear stress increases as Reynolds number increases, aspect ratio decreases, and nanoparticle volume fraction increases.

Item Type: Article
Additional Information: Export Date: 6 December 2012 Source: Scopus CODEN: HTARF Language of Original Document: English Correspondence Address: Mohammed, H.A.; Department of Mechanical Engineering, College of Engineering, Universiti Tenaga Nasional, Selangor, Malaysia References: Daungthongsuk, W., Wongwises, S., Acritical review of convective heat transfer nanofluids. (2007) Renew Syst Energy Rev, 11, pp. 797-817; Trisaki, V., Wongwises, S., Criticalreview of heat transfer characteristics of nanofluids. (2007) Renew Sust Energy Rev, 11, pp. 512-523; Wang, X., Mujumdar, A.S., Heattransfer characteristics of nanofluids: A review. (2007) Int J Therm Sci, 46, pp. 1-19; Huang, C.C., Yan, W.M., Jang, J.H., Laminarmixed convection heat and mass transfer in vertical rectangular ducts with film evaporation and condensation. 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Uncontrolled Keywords: Combined convection, Nanofluids, Numerical simulation, Vertical rectangular duct, Convective heat transfer, Flow characteristic, Governing equations, Heat Transfer enhancement, Nano-fluid, Pure water, Rayleigh number, Rectangular ducts, Wall shear stress, Aspect ratio, Ducts, Finite volume method, Forced convection, Laminar flow, Nanoparticles, Nusselt number, Radiation effects, Reynolds number, Shear stress, Silicon compounds, Titration, Volume fraction, Nanofluidics.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 05 Jul 2013 01:42
Last Modified: 25 Oct 2019 06:17
URI: http://eprints.um.edu.my/id/eprint/6689

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