Study on heat transfer characteristics of matrix rib micro-jet heat sink based on SiC nanofluids

The current research proposes a microfluid coupled array finned microchannel heat sink for the cooling of highpower concentrated solar cells, utilizing SiC-W nanofluids (volume fraction: 0.03 vol%) as the cooling medium. The study employs a combination of numerical simulation and experimental techniques to investigate the flow and heat transfer characteristics of the heat sink. The findings demonstrate that silicon carbide (SiC) nanofluids exhibit superior cooling properties compared to water across different height-diameter ratios and fluid flow rates within the range of 1568 < Re-a < 3005. At a flow rate of 1.7 m/s, the mean convective heat transfer coefficient of the heat sink cooling surface is 27863.36 W/(m(2)center dot degrees C) for water, whereas for SiC-W nanofluids, it is 29661.59 W/(m(2)center dot degrees C) under identical operating conditions, resulting in a 6.5% improvement. SiC-W nanofluids demonstrate enhanced heat transfer performance and reduce the average temperature of the cooling surface by approximately 2.8% compared to water. However, due to the inclusion of solid particles in SiC-W nanofluids, the pressure drop across the heat sink is slightly higher than that observed in water cooling. The energy efficiency ratio (EER) of this device falls within the range of 2-22.3. Comparison of the Nusselt number between the matrix rib microjet heat sink designed in this study and the single-use microchannels and microjets indicates significantly stronger convective heat transfer intensity for the matrix rib microjet heat sink, demonstrating its advantage in heat transfer.