Nanofluid heat transfer enhancement in microchannels: Investigating phases interactions using multiphase Eulerian model

Muhammad M. Generous, Eiyad Abu-Nada, Anas Alazzam

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This study employs a robust multiphase Eulerian model to mimic heat transfer enhancement using nanofluids in a circular microchannel. Unlike the Eulerian models reported in the literature, the current model incorporates phase interactions, and its accuracy is significantly improved by integrating collision viscosity, kinetic viscosity, and frictional viscosity. Comparative analysis against other models like mixture and discrete phase models demonstrates superior performance of the current model, particularly for solid particle volume fractions exceeding 1 %. The model evaluates water-based nanofluids (Ag NPs, MgO, ZnO, Al2O3, ZrO2, SiO2) in circular microchannels. Ag NPs/water excels at low volume fractions and high Reynolds numbers, while MgO/water performs better at higher volume fractions. Moreover, the analysis of the Euler number indicates a decreasing trend with increasing Reynolds number across all nanofluids. However, no notable variation in the Euler number is observed when maintaining constant volume fraction and Reynolds number. Ultimately, the model is applied to obtain bulk fluid properties, such as viscosity and thermal conductivity, after suspending the nanoparticles. Subsequently, these properties were incorporated into the single-phase model. Utilizing these derived bulk properties was found to substantially enhance the accuracy of the single-phase model, demonstrating its reliability by yielding results within 13.52 % of experimental data.

    Original languageBritish English
    Article number100741
    JournalInternational Journal of Thermofluids
    Volume23
    DOIs
    StatePublished - Aug 2024

    Keywords

    • Bulk properties of nanofluids
    • Eulerian model
    • Interphase heat exchange
    • Interphase momentum exchange

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