Al₂O₃-Water Nanofluid Jet Impingement Cooling With Magnetic Field

Abstract

Numerical study of double jet impingement cooling of an isothermal surface with Al₂O₃-water nanofluid under the influence of magnetic field was performed. Galerkin-weighted residual finite element method was utilized for the solution of the governing equations. The numerical simulations were performed for various values of Reynolds number (between 100 and 400), solid particle volume fraction (between 0 and 4%), and Hartmann number (between 0 and 2.5). The ratio of the slot-to-plate distance was varied between 4 and 16 whereas ratio of the distance between the slots to slot width was varied between 5 and 22.5. It was observed that magnetic field retarded the fluid flow and reduced the local and average heat transfer. At the highest value of the Hartmann number, the fluid cannot reach the stagnation point. Depending on the distance between the slots and slots to plate distance, average heat transfer enhances by about 46% and its value increases linearly with nanoparticle volume fraction. This study is particularly important where magnetic field is present and weakens the convective heat transfer characteristics in jet impingement cooling whereas it is possible to enhance its thermal performance by utilization of nanoparticles.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Fatih Selimefendigil

Fatih Selimefendigil is an Associate Professor in the Department of Mechanical Engineering at Celal Bayar University, Manisa, Turkey. He completed his Ph.D. at the Technical University of Munich (Chair for Thermodynamics) in 2010. He worked in German Aerospace Center (DLR) and Department of Thermal Engineering and Desalination Technology at King Abdulaziz University, Saudi Arabia. His general research interests are computational fluid dynamics, heat transfer and thermo-acoustics.

Hakan F. Öztop

Hakan F. Oztop is a Professor at the Department of Mechanical Engineering, Technology Faculty, Firat University, Elazig, Turkey. He received his Bachelors degree in Mechanical Engineering from Firat University in 1996 and later on pursued masters and Ph.D. degrees at the same university energy division in 2003. His main research fields are computational fluid dynamics, energy storage, combustion and renewable energy. He had been in University De Montreal, Ecole Polytechnique, Canada in 2002 and Auburn University Department of Mechanical Engineering in 2004 for short time studies. He has more than 200 international journal papers.