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Entropy Production Analysis in an Octagonal Cavity with an Inner Cold Cylinder: A Thermodynamic Aspect

Author

Listed:
  • Jiaul Haque Saboj

    (Department of Electrical and Computer Engineering, North South University, Dhaka 1229, Bangladesh)

  • Preetom Nag

    (Department of Mathematics and Physics, North South University, Dhaka 1229, Bangladesh)

  • Goutam Saha

    (Department of Mathematics, University of Dhaka, Dhaka 1000, Bangladesh
    School of Mechanical and Mechatronic Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia)

  • Suvash C. Saha

    (School of Mechanical and Mechatronic Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia)

Abstract

Understanding fluid dynamics and heat transfer is crucial for designing and improving various engineering systems. This study examines the heat transfer characteristics of a buoyancy-driven natural convection flow that is laminar and incompressible. The investigation also considers entropy generation ( E gen ) within an octagonal cavity subject to a cold cylinder inside the cavity. The dimensionless version of the governing equations and their corresponding boundary conditions have been solved numerically using the finite element method, employing triangular mesh elements for discretization. The findings indicated that incorporating a cold cylinder inside the octagonal cavity resulted in a higher heat transfer (HT) rate than in the absence of a cold cylinder. Furthermore, using the heat flux condition led to a higher average Nusselt number ( Nu avg ) and a lower Bejan number ( Be ) than the isothermal boundary condition. The results also showed that HT and E gen were more significant in the Al 2 O 3 -H 2 O nanofluid than the basic fluids such as air and water, and HT increased as χ increased. The current research demonstrates that employing the heat flux condition and incorporating nanoparticles can enhance the rate of HT and Egen . Furthermore, the thermo-fluid system should be operated at low R a to achieve greater HT effectiveness for nanofluid concerns.

Suggested Citation

  • Jiaul Haque Saboj & Preetom Nag & Goutam Saha & Suvash C. Saha, 2023. "Entropy Production Analysis in an Octagonal Cavity with an Inner Cold Cylinder: A Thermodynamic Aspect," Energies, MDPI, vol. 16(14), pages 1-25, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5487-:d:1197907
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    References listed on IDEAS

    as
    1. Ismail, Md. Farhad & Hasan, Muhammad Noman & Saha, Suvash C., 2014. "Numerical study of turbulent fluid flow and heat transfer in lateral perforated extended surfaces," Energy, Elsevier, vol. 64(C), pages 632-639.
    2. Goutam Saha & Ahmed A.Y. Al-Waaly & Manosh C. Paul & Suvash C. Saha, 2023. "Heat Transfer in Cavities: Configurative Systematic Review," Energies, MDPI, vol. 16(5), pages 1-53, February.
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