Thermomagnetic convection and entropy generation in a hybrid nanofluid filled wavy-walled cavity heated non-uniformly

Authors

  • Nirmalendu Biswas Department of Power Engineering, Jadavpur University, Salt Lake, Kolkata-700106, India
  • Dipak Kumar Mandal Department of of Mechanical Engineering, Government Engineering College Samastipur, Bihar-848127, India
  • Nirmal K. Manna Department of Mechanical Engineering, Jadavpur University, Kolkata-700032, India
  • Ali Cemal Benim Department Mechanical and Process Engineering, Duesseldorf University of Applied Sciences, Germany

DOI:

https://doi.org/10.24425/ather.2025.154182

Keywords

magnetohydrodynamic flow, nanofluid flow, hybrid wavy-wall heating, entropy generation, heat transfer

Abstract

In this work, thermomagnetic convection and irreversibility production in a hybrid nanofluid-filled wavy-walled porous thermal system containing a semi-circular heated bottom is presented. Both the sidewalls of the enclosure are cooled and undulated with varying undulation numbers. The lower wall is partially undulated following a semi-circular-shaped object and is heated isothermally. The horizontal walls are insulated. The cavity is occupied with Cu-Al2O3/water-based hybrid nanofluid and porous substances under the impact of the evenly applied horizontal magnetic field. This work significantly contributes to the existing research rendering an exhaustive understanding of the hydrothermal flow-physics as well as irreversibility production of a hybrid nanofluid in the cavity having surface undulation. The Galerkin weighted finite element method is utilized to solve the mathematical model. The hydrothermal performance of the thermal system is considerably influenced by various pertinent factors such as Darcy-Rayleigh number, Darcy number, Hartmann number, and number of undulations. The wall undulations have a critical role in altering the hydrothermal performance. Heatlines are used to analyse heat transport dynamics from the protruded hot surface to the heat sink. The protruded heater wall induces the formation of a hot upward plume in the nearest fluid layers. The flow divides into two parts forming a pair of circulations due to symmetrical cooling at the sidewalls. The flow behaviours are significantly dampened by increasing the Hartmann number. The associated total entropy generation is also demonstrated. This study contributes to the existing domain knowledge and provides insights for designing and optimizing similar thermal systems.

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Published

2025-03-30

How to Cite

Biswas, Nirmalendu, et al. “Thermomagnetic Convection and Entropy Generation in a Hybrid Nanofluid Filled Wavy-Walled Cavity Heated Non-Uniformly”. Archives of Thermodynamics, vol. 46, no. 1, Mar. 2025, pp. 61-81, doi:10.24425/ather.2025.154182.

Issue

Vol. 46 No. 1 (2025)

Section

Articles