Thermo-hydraulic behavior of the ribbed minichannel heat sink, having nine rectangular-shaped channels, is numerically investigated in the present study by using a multi-phase mixture model. Four different types of ribs (semi-circular, rectangular, triangular and trapezoidal ribs) and two hybrid nanofluids (Al₂O₃ + TiO₂/DI water and Al₂O₃ + Cu/DI water) with a total nanoparticle volume concentration of 0.1% are considered. Heat transfer coefficient, Nusselt number, pressure drop, friction factor, performance evaluation criterion and thermal performance factor are evaluated for different Reynolds numbers (90–450) or flow rate (0.1–0.5 lpm). The maximum heat transfer coefficient (6690.12 W/m² K) is observed for semi-circular ribs with Al₂O₃ + Cu hybrid nanofluid. The performance evaluation criterion is above 1 for all the cases except the plain channel with Al₂O₃ + TiO₂ hybrid nanofluid at a lower flow rate. The combination of the semi-circular ribbed channel with Al₂O₃ + Cu hybrid nanofluid has a maximum performance evaluation criterion of 1.40 and that with Al₂O₃ + TiO₂ hybrid nanofluid has a maximum thermal performance factor of 1.16. The thermal performance factor has an increasing trend with the flow rate for the semi-circular ribbed channel. The semi-circular ribbed channel shows better performance over other ribbed channels because the working fluid gets stuck and stagnant between two consecutive ribs in other ribbed channels, which leads to higher thermal resistance.

本研究中使用多相混合模型对具有九个矩形通道的肋状微通道散热器的热工水力行为进行了数值研究。四种不同类型的肋条（半圆形、矩形、三角形和梯形肋条）和两种混合纳米流体（Al ₂ O ₃  + TiO ₂ /DI 水和 Al ₂ O ₃  + Cu/DI 水），纳米粒子的总体积浓度为0.1% 被考虑。针对不同雷诺数 (90–450) 或流速 (0.1–0.5 lpm) 评估传热系数、努塞尔数、压降、摩擦系数、性能评估标准和热性能系数。最大传热系数（6690.12 W/m ² K) 对于具有 Al ₂ O ₃  + Cu 混合纳米流体的半圆形肋条观察到。除了具有较低流速的Al ₂ O ₃  + TiO ₂混合纳米流体的普通通道外，所有情况的性能评价标准均高于1 。半圆形肋状通道与Al ₂ O ₃  + Cu杂化纳米流体的组合最大性能评价标准为1.40，与Al ₂ O ₃  + TiO _{2 的组合}具有最大性能评价标准混合纳米流体的最大热性能系数为 1.16。半圆形肋状通道的热工性能系数随着流量的增加而增加。半圆形带肋通道比其他带肋通道表现出更好的性能，因为工作流体在其他带肋通道的两个连续肋之间卡住并停滞，从而导致更高的热阻。