The effect of thermophysical properties on laminar natural convection inside a differentially heated enclosure filled with nanofluids is numerically investigated. Expressions for minimum, average, and maximum values of nanofluid viscosity and thermal conductivity are deduced for an Al 2 O 3 / water -based nanofluid. The configuration is mathematically simulated using four nonhomogeneous governing field equations: two mass balance equations (one for each phase), a momentum equation, and an energy equation. Brownian motion and thermophoresis are considered as the physical transport mechanisms for the nanoparticles. A numerical finite difference scheme is developed to solve the governing equations. The results of the Nusselt numbers for pure water and nanofluids are found to increase monotonously versus the Rayleigh number in a typical characteristic curve between two asymptotes. Correlations for the Nusselt number are developed. A parametric analysis of the results indicates that the heat transfer effectiveness of nanofluids is highly dependent on the nanofluid viscosity, whereas the nanofluid thermal conductivity has a secondary effect. The minimum values of nanofluid viscosity always lead to heat transfer augmentation, whereas maximum values mostly lead to heat transfer degradation, except for the observed augmentation in very high Grashof number values. Comparative examinations of the results as well as contours for streamlines, isotherms, void fraction distribution, and local apparent Reynolds number are presented.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Thermophysical Properties-Based Evaluation of Nanofluids Laminar Natural Convection Inside Square Enclosure


    Contributors:

    Published in:

    Publication date :

    2015-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Natural Convection Inside a Porous Square Enclosure Embedded with Two Elliptic Cylinders

    Chourasia, Ankit / Kumar Deka, Dhrijit / Bhowmick, Debayan et al. | AIAA | 2022


    Transient Analysis of Natural Convection around a Pair of Circular Cylinders inside a Square Enclosure

    Tomar, Mukul / Kumar, Naveen / Malhotra, Aahan | British Library Conference Proceedings | 2018


    Transient Analysis of Natural Convection around a Pair of Circular Cylinders inside a Square Enclosure

    Malhotra, Aahan / Tomar, Mukul / Kumar, Naveen | SAE Technical Papers | 2018


    Natural Convection of Reacting Chemical in Square Enclosure with Circular Cylinder

    Chandra Roy, Nepal / Reddy Gorla, Rama Subba | AIAA | 2022