This paper presents an experimental and numerical investigation on the thermofluidic performance of 0.5–2.0 % of the volumetric concentration of Al₂O₃-water nanofluids through oblique fin heat sink microchannel (OFHS MC) in the Reynolds number range 100–300. In comparison, experiments were also performed using a straight channel heat sink microchannel (SCHS MC) of the same hydraulic diameter as the oblique fin channel. The fluid flow is simulated using the RNG k-ε model in both periodic and full domain numerical analysis. The phenomenological behaviour of the nanofluid flow is further studied using numerical results. The oblique fin microchannel encouraged the secondary flow, thus enhanced the macroscopic mixing. Boundary layer disruption and vortices generation in the secondary channel is the critical phenomena of improved heat transfer. A substantial improvement of heat transfer coefficient is achieved for nanofluid and oblique fin heat sink combinations compared to the straight channel heat sink. The heat transfer coefficient is increased at increasing nanofluid concentrations for any given Reynolds number and channel configuration. The enhancement of about 55 % in the heat transfer coefficient with a 2 % volumetric concentration of nanofluid is achieved at Re = 300 in an oblique fin heat sink. The heat transfer enhancement is always significant than the pressure penalty. The oblique fin heat sink improves the average junction temperature considerably compared to the straight channel heat sink. The inclusion of nanofluid can reduce the experimental junction temperature by up to 6 °C. Therefore, the combined advantage of the oblique fin heat sink with nanofluid is anticipated as one of the potential alternatives for electronics cooling.

本文对 Al ₂ O ₃体积浓度的 0.5-2.0% 的热流体性能进行了实验和数值研究。-水纳米流体通过雷诺数范围为 100-300 的斜翅片散热器微通道 (OFHS MC)。相比之下，还使用与斜翅片通道具有相同水力直径的直通道散热器微通道 (SCHS MC) 进行了实验。在周期性和全域数值分析中使用 RNG k-ε 模型模拟流体流动。使用数值结果进一步研究了纳米流体流动的现象学行为。斜翅片微通道促进了二次流动，从而增强了宏观混合。二级通道中的边界层破裂和涡流产生是改善传热的关键现象。与直通道散热器相比，纳米流体和斜翅片散热器组合实现了传热系数的显着提高。对于任何给定的雷诺数和通道配置，传热系数随着纳米流体浓度的增加而增加。在 Re = 300 的斜翅片散热器中，当纳米流体的体积浓度为 2% 时，传热系数提高了约 55%。传热增强总是比压力损失显着。与直通道散热器相比，斜翅片散热器大大提高了平均结温。包含纳米流体可以将实验结温降低高达 6°C。所以，