Document Type: Research Article

Authors

• Amir Karimdoost Yasuri ¹
• Mohsen Izadi ²
• Hossein Hatami ²

¹ Department of Mechanical Engineering, Lorestan University

² Lorestan University

Abstract

Natural convection heat transfer in a square enclosure with a horizontal baffle at the center line of left wall containing Al₂O₃-water in the presence of a magnetic field is investigated numerically. The top and bottom horizontal walls are adiabatic. The left wall and the baffle are maintained in constant temperature T_hand the right wall is maintained in constant temperature T_c (T_c <T_h). Discretized equations are solved using the SIMPLE algorithm. The numerical simulations have been carried out to determine the effect of parameters in the following ranges: Rayleigh number, Ra=10³ to 10⁶, nanoparticles volume fraction between  =0 to 5%, Hartmann number varied from Ha=0 to 60 and baffle length (L₁=0 to 0.5L). The results show that the heat transfer rate increases with increasing Rayleigh number, but with increasing Hartmann number decreases. Also, increasing the baffle length enhances the heat transfer rate into the enclosure.

Keywords

• nanofluid
• Natural convection
• Baffle
• Magnetic field
• Al2O3-water

Main Subjects

• Energy, Heat Transfer
• Fluid Mechanics, CFD
• Nano Technology