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Numerical Analysis of Entropy Generation in a Double Stage Triangular Solar Still Using CNT-Nanofluid under Double-Diffusive Natural Convection

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  • Chemseddine Maatki

    (Department of Mechanical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University, Riyadh 11432, Saudi Arabia
    Laboratory of Metrology and Energy System, University of Monastir, Monastir 5000, Tunisia)

Abstract

The analysis of entropy generation provides valuable information for the design and optimization of thermal systems. Solar stills are used for water desalination and purification. Using renewable energies, they provide a sustainable solution for drinking water supply in remote areas and off-grid situations. This work focuses on the 3D numerical study of entropy generation in a two-stage solar still subjected to the natural double diffusion convection phenomenon in the presence of CNT nanoparticles. The effects of Rayleigh number, buoyancy ratio, and nanofluid concentration on thermal, solutal, and viscous irreversibilities and flow structure were studied. The results show that increasing the buoyancy ratio leads to an increase in thermal and solutal entropy generation. The results of this study also show that total entropy is minimal for positive volume force ratios, N, at a nanoparticle volume fraction of around 3%, and for negative N ratios, at a volume fraction of around 4%.

Suggested Citation

  • Chemseddine Maatki, 2023. "Numerical Analysis of Entropy Generation in a Double Stage Triangular Solar Still Using CNT-Nanofluid under Double-Diffusive Natural Convection," Mathematics, MDPI, vol. 11(13), pages 1-19, June.
    • Handle: RePEc:gam:jmathe:v:11:y:2023:i:13:p:2818-:d:1177531
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    References listed on IDEAS

    as
    1. Lioua Kolsi & Shafqat Hussain & Kaouther Ghachem & Muhammad Jamal & Chemseddine Maatki, 2022. "Double Diffusive Natural Convection in a Square Cavity Filled with a Porous Media and a Power Law Fluid Separated by a Wavy Interface," Mathematics, MDPI, vol. 10(7), pages 1-18, March.
    2. Lioua Kolsi & Kaouther Ghachem & Samia Larguech & Ghada AlNemer, 2022. "Numerical Investigation of the Double Diffusive Convection in 3D Trapezoidal Solar Still Equipped with Conductive Fins," Mathematics, MDPI, vol. 10(12), pages 1-19, June.
    3. Kabeel, A.E. & Abdelgaied, Mohamed, 2020. "Enhancement of pyramid-shaped solar stills performance using a high thermal conductivity absorber plate and cooling the glass cover," Renewable Energy, Elsevier, vol. 146(C), pages 769-775.
    4. Kumar, Vinay & Murthy, S.V.S.S.N.V.G. Krishna & Kumar, B.V. Rathish, 2023. "Multi-force effect on fluid flow, heat and mass transfer, and entropy generation in a stratified fluid-saturated porous enclosure," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 203(C), pages 328-367.
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