Many researchers in the past decade have focused on the influence of nanoparticle volume concentration on the thermophysical properties of hybrid nanofluid. However, less research is available on the effect of the mixture composition between two different nanoparticles to the thermophysical properties of the fluid. This study means to research the influence of TiO₂-Al₂O₃ nanoparticle mixing ratio on the thermal conductivity, rheological properties and dynamic viscosity of water-based hybrid nanofluid. The water-based hybrid nanofluid was prepared using five different proportion of TiO₂ and Al₂O₃ nanoparticles at a fixed 1.0% volume concentration. The temperature range selected for the experimental test procedure is between 30-70 °C. The mean crystallite size of TiO₂ and Al₂O₃ nanoparticles calculated using the results from XRD characterization is about 19.1 and 8.31 nm, respectively. The highest thermal conductivity value of 1.134 W/m.K is observed for hybrid nanofluid with the nanoparticle mixing ratio of 50:50 at 70 °C, with an average thermal conductivity augmentation of 71% comparative to deionized (DI) water. The developed hybrid nanofluid found to exhibit Newtonian flow behaviour at all nanoparticle mixing ratios and temperature. Moreover, the hybrid nanofluid with 80:20 ratio recorded the highest dynamic viscosity of 1.98 mpa.s. Besides, the prepared hybrid nanofluid was found to achieve moderate stability with zeta potential value of 29.6 mV. Finally, two different correlation model was developed using regression analysis to predict the thermal conductivity and relative dynamic viscosity for various TiO₂-Al₂O₃ water-based hybrid nanofluid.

在过去的十年中，许多研究人员将注意力集中在纳米颗粒体积浓度对混合纳米流体热物理性质的影响上。然而，关于两种不同纳米颗粒之间的混合物组成对流体热物理性质影响的研究很少。本研究旨在研究TiO ₂ -Al ₂ O ₃纳米粒子混合比对水基杂化纳米流体的导热系数，流变性质和动态粘度的影响。使用五种不同比例的TiO ₂和Al ₂ O ₃制备了水性杂化纳米流体固定浓度为1.0％的纳米颗粒。为实验测试程序选择的温度范围是30-70°C。TiO ₂和Al ₂ O ₃的平均微晶尺寸使用XRD表征结果计算得到的纳米颗粒分别约为19.1和8.31 nm。对于杂化纳米流体，在70°C时纳米颗粒的混合比为50:50，观察到最高的导热系数值为1.134 W / mK，与去离子（DI）水相比，平均导热系数提高了71％。发现开发的杂化纳米流体在所有纳米颗粒混合比和温度下均表现出牛顿流动行为。此外，比例为80:20的杂化纳米流体的最高动态粘度为1.98mpa.s。此外，发现制备的杂化纳米流体具有适度的稳定性，ζ电势值为29.6mV。最后，使用回归分析开发了两种不同的相关模型，以预测各种TiO的热导率和相对动态粘度₂ -Al ₂ O ₃水性杂化纳米流体。