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      Numerical Study of Laminar Flow and Convective Heat Transfer Utilizing Nanofluids in Equilateral Triangular Ducts with Constant Heat Flux

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      Materials
      MDPI
      nanofluids, heat transfer enhancement, Nusselt number, Peclet number

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          Abstract

          This study numerically investigates heat transfer augmentation using water-based Al 2O 3 and CuO nanofluids flowing in a triangular cross-sectional duct under constant heat flux in laminar flow conditions. The Al 2O 3/water nanofluids with different volume fractions (0.1%, 0.5%, 1%, 1.5%, and 2%) and CuO/water nanofluids with various volume fractions (0.05%, 0.16%, 0.36%, 0.5%, and 0.8%) are employed, and Reynolds numbers in the range of 700 to 1900 in a laminar flow are considered. The heat transfer rate becomes more remarkable when employing nanofluids. As compared with pure water, at a Peclet number of 7000, a 35% enhancement in the convective heat transfer coefficient, is obtained for an Al 2O 3/water nanofluid with 2% particle volume fraction; at the same Peclet number, a 41% enhancement in the convective heat transfer coefficient is achieved for a CuO/water nanofluid with 0.8% particle volume concentration. Heat transfer enhancement increases with increases in particle volume concentration and Peclet number. Moreover, the numerical results are found to be in good agreement with published experimental data.

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          Most cited references41

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          HYDRODYNAMIC AND HEAT TRANSFER STUDY OF DISPERSED FLUIDS WITH SUBMICRON METALLIC OXIDE PARTICLES

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            Heat transfer enhancement of nanofluids

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              A new thermal conductivity model for nanofluids

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                15 July 2016
                July 2016
                : 9
                : 7
                Affiliations
                Department of Mechanical Engineering, Kun Shan University, Tainan 71070, Taiwan; e056ting@ 123456gmail.com
                Author notes
                [* ]Correspondence: sshou@ 123456mail.ksu.edu.tw ; Tel.: +886-6-205-0496
                Article
                materials-09-00576
                10.3390/ma9070576
                5456908
                8becee26-dc7c-4eca-9936-27fb95787cbd
                © 2016 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/).

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                Article

                nanofluids,heat transfer enhancement,nusselt number,peclet number

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