Thermomagnetic mix convection heat transfer of air in the influence of the magnetic field of permanent magnet

Abstract

Due to their various applications in both cooling and heating, fins have received a lot of attention from researchers. Several methods in thermal enhancement of fins such as shape analysis, etc. have been investigated. In this paper, the effect of magnetic field on heat transfer coefficient of air in the rotated enclosure has been investigated which Neodymium–Iron–Boron fin is used as a magnetic field source. Oxygen atoms due to their paramagnetic properties are affected by the magnetic field. The heat transfer mechanism in the enclosure, because of the existence of Kelvin body force, is forced convection. The effect of Rayleigh number, cavity degree, and residual magnetic flux density has been studied (The range of the studied parameters is as follows: Br (0–5) T, Ra (1 ×105–5 ×105) ∝(0−60) Degree.) and the results are represented as a streamline, temperature contours and profiles, velocity, and Nusselt number profiles. Results show that with increasing of fins magnetic power up to Br = 5 T, Nusselt number improved by 5.422%. Eventually, the optimum state occurred in Rayleigh 5×105 at an angle of 15° and Br = 5.0T which had 9.68% heat transfer enhancement.

Keywords

• Thermomagnetic
• Kelvin force
• Permanent magnet
• Mix convection