Thermo-hydraulic performance of nanofluids in a bionic heat sink

A bionic surface based on the wing structure of the dragon louse is developed and applied in the thermal management system of electronic components. Fe3O4-water nanofluids are introduced and their thermal-hydrodynamic behaviors under magnetic field are studied. The influence of nanofluids concentration (xi = 0.1-0.5%), Reynolds numbers (Re = 712-1400), tilt angles of magnetic field (theta = 0 degrees, 30 degrees, 60 degrees) and intensity of magnetic field (beta = 0.0 T, 0.005 T, 0.010 T, 0.015 T) on the heat transfer are considered in the system. Exergy efficiency and entropy production of CPU cooling system are analyzed. Results presented that the bionic surface based on the wing structure of the dragon louse shows an excellent drag reduction effect compared with the smooth surface, which can reach 35.4%. The maximal reduced ratio of CPU surface temperature under magnetic field is 34.42% in comparison with that under no magnetic field, and the maximal reduced ratio of CPU surface temperature with theta = 60 degrees is 14.96% in comparison with theta = 0 degrees. It shows an augmentation of heat transfer for most cases with the identical rate of flow from the point of exergy efficiency. When nanofluids concentration is xi = 0.3%, Reynolds number is Re = 1402, tilt angle is theta = 60 degrees, and magnetic field strength is beta = 0.015 T, the minimum entropy production is obtained.

Automated summary

The study focuses on the development of a bionic surface based on the wing structure of the dragon louse for thermal management in electronic components, as well as the behavior of Fe3O4-water nanofluids under magnetic field. Various factors affecting heat transfer, such as nanofluid concentration, Reynolds number, magnetic field angle, and intensity, were considered. Results show that the bionic surface has a significant drag reduction effect and the magnetic field has a notable influence on CPU cooling.