Radial piezoelectric magnetic fans (RPMF) mathematical model development and design optimization for electronics cooling

Abstract

Nowadays, almost everything was run by electronic-based devices regardless of its size and applications, functioning for kids to adults and operating throughout the days and nights. It is critical to manage the electronic thermal management to sustain the electronic device for longer period. This paper enhances the design of multiple piezoelectric magnetic fans (MPMF) to achieve maximum thermal efficiency. Some geometric parameters were investigated such as the magnet location, x, distance between magnets, d, and the orientation, θ of the fans. Response Surface Method (RSM) was used as optimization tool. Therefore, this paper presents a mathematical model of MPMF to predict the maximum fan deflection by optimizing the value of x,d, and θ. The experimental results showed that the optimal value of x was 44 mm from the origin, the range of d value was in the range of 14.5 mm to 15.6 mm and in overall, fan deflection of radial piezoelectric magnetic fans (RPMF) was better than array piezoelectric magnetic fans (APMF). The most consistent average fan deflection was 11.6 mm at d = 14.5 mm and resonant frequency, fr = 42.66 Hz. The Reynolds number, Re for RPMF has increased from 437 to 577 (improved by 32 %) compared to APMF. The heat convection coefficient, h, for RPMF has improved 8.07 % from 32.96 to 35.62 and the thermal resistance reduced by 7.6 % from 1.58 to 1.46 which led to 5 % increment of overall thermal efficiency, 63 %. This clearly shows that the thermal efficiency has been improved by optimizing the x, d and θ values of the MPMF.