Heat Transfer Characteristics of Microjet Coupled Microfin Channel Heat Sink with Nanofluid as Cooling Fluid

The heat generated during the operation of concentrated solar cells has negative impact on them. As a necessary component in the working process of concentrated solar cells, heat dissipation devices play an important role in ensuring the long-term safe, stable, and efficient operation of solar cells under concentrated conditions. The use of nanofluids for cooling is an effective way. A micro jet coupled micro rib channel heat sink was constructed in this work, with nanofluid as the cooling medium. Turbulent heat transfer and flow characteristics of the heat sink were studied using a combination of numerical simulation and experimental research methods. Through numerical simulation, the cooling effects of SiC, Al₂O₃, SiO₂, TiO₂ nanofluids and water as cooling media were compared and discussed. Finally, the SiC-W nanofluid with the optimal cooling performance was selected for the experiment. It is experimentally shown that the SiC-W nanofluids have the several advantages as compared with water, with an increase in thermal conductivity of about 10.2%, an increase in average heat transfer coefficient of about 6.7% and an increase in pressure loss of no more than 1% of water. This study demonstrates the superior heat transfer performance and application value of the SiC-W nanofluids.