Sharif University of Technology Scientia Iranica 1026-3098 Articles in Press 2025 02 19 Numerical analysis of natural convection of ferric oxide-water nanofluid flow in a wavy staggered cavity energized by a chemical exothermic reaction 23824 10.24200/sci.2025.65104.9297 EN Farooq H. Ali Mechanical Engineering Department, College of Engineering, University of Babylon, Babylon, Iraq Hussein H. Alaydamee Department of Chemical Engineering, University of Al-Qadisiyah, College of Engineering, Al-Qadisiyah, 58002, Iraq Qusay H. Al-Salami Department of Business Administration, College of Administrative and Financial Sciences, Cihan University-Erbil, Iraq Hameed K. Hamzah Mechanical Engineering Department, College of Engineering, Babylon University, Babylon, Iraq Mohammed Azeez Alomari - Department of Mechanical Engineering, University of Al-Qadisiyah, Al-Diwaniyah, 58001, Iraq - College of Engineering, University of Warith Al-Anbiyaa, Karbala, Iraq Qusay Rasheed Al-amir Air Conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University, Babylon 51001, Iraq Journal Article 2024 08 06 Over the last 28 years, numerous investigations have been conducted to enhance common fluids like water by dispersing nanoparticles such as Fe3O4. To examine the time-dependent natural convection of such nanofluid under the influence of exothermic reaction in tandem with other governing parameters, the Finite Element technique is applied in the current work. Controlling factors such as Ra (103 to105), Ha (0 to 60), Fk (0 to 4), enclosure wavelength (single wave, double wave, and three waves), magnetic field inclination angle (0o to 90o), and volume fraction of nanoparticles (0 to 0.08). The vertical wavy walls are considered at Th while the middle flat vertical walls are kept at Tc leaving all other surfaces at adiabatic condition. Results revealed that raising Ra to 105, when applying double waves at the active walls, was shown to have the most impact on the mean Nu, increasing by 142.85% for Ha=12, φ=0.02, Fk=1 at 5 sec. Additionally, Nuavg was found to increase significantly when Fk is raised from 0 to 4, increasing by 76.12% in the absence of magnetic effects for Ra=105, and φ =0.04. Also, an impressive impact of nanoparticles was achieved by increasing the volume percentage of nanoparticles in the base https://scientiairanica.sharif.edu/article_23824_f10164dd0225dd010f62f0dff4af1630.pdf