Heat transfer and entropy generation analysis of hybrid graphene/Fe3O4 ferro-nanofluid flow under the influence of a magnetic field

Mohammad Mehrali, Emad Sadeghinezhad, Amir Reza Akhiani, Sara Tahan Latibari, Hendrik Simon Cornelis Metselaar, A. Sh Kherbeet, Mehdi Mehrali

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The heat transfer characteristics and entropy generation rate of hybrid graphene-magnetite nanofluids under forced laminar flow that subjected to the permanent magnetic fields were investigated. For this purpose, a nanoscale reduced graphene oxide-Fe3O4 hybrid was synthesized by using graphene oxide, iron salts and tannic acid as the reductant and stabilizer. The thermophysical and magnetic properties of the hybrid nanofluid have been widely characterized and thermal conductivity has shown an enhancement of 11%. The experimental results indicated that the heat transfer enhancement of hybrid magnetite nanofluid compared to the case of distilled was negligible when no magnetic field was applied. Additionally, the heat transfer characteristics have been improved significantly under magnetic field. The outcome of the analysis shows that the total entropy generation rate was reduced up to 41% compared to distilled water. It appears that these magnetic hybrid nanofluids can function as good alternative fluids in the magnetic thermal engineering systems.
    Original languageEnglish
    JournalPowder Technology
    Volume308
    Pages (from-to)149-157
    ISSN0032-5910
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Convective heat transfer
    • Entropy generation
    • Graphene
    • Laminar flow
    • Magnetic field
    • Magnetic nanofluid

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