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  • On the performance of Ag/oil nanofluids in heat transfer enhancement in a sinusoidal tube: Constant heat flux boundary condition

    Author(s)
    Jafarimoghaddam, Amin
    Aberoumand, Sadegh
    Griffith University Author(s)
    Aberoumand, Sadegh
    Year published
    2017
    Metadata
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    Abstract
    The present work provides an empirical investigation on the thermal characteristics of Ag/oil nanofluids flow inside a sinusoidal tube under a constant heat flux boundary condition. Ag/oil nanofluids have been prepared in low-volume concentrations of 0.011%, 0.044%, and 0.171%. The average size of the nanoparticles was 20 nm. A heated coil was attached to the upper and lower surface of the tube that satisfied the constant thermal boundary condition of 204 W. The experiment has been pursued at low Reynolds numbers less than 160. A loop was designed to keep the flow hydrodynamically fully developed during the experiment. The ...
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    The present work provides an empirical investigation on the thermal characteristics of Ag/oil nanofluids flow inside a sinusoidal tube under a constant heat flux boundary condition. Ag/oil nanofluids have been prepared in low-volume concentrations of 0.011%, 0.044%, and 0.171%. The average size of the nanoparticles was 20 nm. A heated coil was attached to the upper and lower surface of the tube that satisfied the constant thermal boundary condition of 204 W. The experiment has been pursued at low Reynolds numbers less than 160. A loop was designed to keep the flow hydrodynamically fully developed during the experiment. The test case was a sinusoidal tube. Upper and lower surfaces of the tube have been designed sinusoidally. Moreover, the width of the plates was long enough, so the problem was not considerably affected by the three-dimensional releasing effect. Convective heat transfer coefficient and Nusselt number were calculated. It has been observed that based on the acquired data of the present work, convective heat transfer coefficient increased up to 23% for the best case (nanofluid with a volume concentration of 0.171%) compared to the base fluid. This happened while the rise of the friction factor was very low. In addition, a comparison between the new results and the previous work by authors showed the positive performance of sinusoidal tubes in increasing the convective heat transfer coefficient (the average increase was calculated to be about 82%) compared to the annular tube.
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    Journal Title
    Heat Transfer
    Volume
    46
    Issue
    7
    DOI
    https://doi.org/10.1002/htj.21250
    Subject
    Aerospace engineering
    Mechanical engineering
    Other engineering
    Science & Technology
    Physical Sciences
    Thermodynamics
    Ag/oil nanofluid
    convective heat transfer coefficient
    Publication URI
    http://hdl.handle.net/10072/409631
    Collection
    • Journal articles

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