An experimental investigation in mini channel heat sink has been performed to assess the thermal-hydraulic behavior of composite dispersed hybrid nanofluid. Reduced graphene oxide-Zinc oxide (rGO-ZnO) nanocomposite particles have been synthesized and dispersed in water to prepare hybrid nanofluid with 0.01% volume concentration. Effects of different Reynolds number (50–600), volumetric flow rate (0.1–0.5 lpm), heat flux (33.33–66.67 W/cm²), channel aspect ratio (2.5–5; corresponding hydraulic diameter: 1.14–1.33 mm) on heat transfer, pressure drop and their relative performance characteristics are examined in details. Reduction in channel aspect ratio from 5 to 2.5 (hydraulic diameter from 1.33 to 1.11 mm) enhances the convective heat transfer coefficient by 47.2% at a flow rate of 0.5 lpm. The heat transfer coefficient significantly increases by about 17.41%, with rise in heat flux from 33.33 W/cm² to 66.67 W/cm². The effect of heat flux on the friction factor is not significant throughout the Reynolds number range. Performance evaluation criteria has a decreasing-increasing-decreasing trend with flow rate for all channel aspect ratios and heat fluxes. An optimal flow rate has been observed for the figure of merit at all the combinations of heat flux and channel aspect ratio. The figure of merit has a maximum value of 1.39 for a channel aspect ratio of 3.75 (i.e., hydraulic diameter of 1.26 mm) and heat flux of 66.67 W/cm².

已经在微型通道散热器中进行了实验研究，以评估复合分散混合纳米流体的热工行为。已经合成了还原的氧化石墨烯-氧化锌（rGO-ZnO）纳米复合颗粒，并将其分散在水中以制备体积浓度为0.01％的杂化纳米流体。不同雷诺数（50–600），体积流量（0.1–0.5 lpm），热通量（33.33–66.67 W / cm ^{2）的影响}），对传热，压降及其相对性能特征的通道长宽比（2.5-5；相应的水力直径：1.14-1.33 mm）进行了详细检查。通道长宽比从5降低到2.5（液压直径从1.33毫米降低到1.11毫米），以0.5 lpm的流量将对流换热系数提高47.2％。随着热通量从33.33 W / cm ²升高到66.67 W / cm ²，传热系数显着提高了约17.41％。。在雷诺数范围内，热通量对摩擦系数的影响并不明显。对于所有通道的长宽比和热通量，性能评估标准都随着流量的增加而增加-减少-减少的趋势。在所有热通量和通道长宽比的组合下，均能获得品质因数的最佳流速。对于3.75的通道纵横比（即，液压直径为1.26mm）和热通量为66.67W / cm ²，品质因数的最大值为1.39 。