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Investigation with rheological behavior of liquid paraffin/Al2O3 nanofluid: Experimental approach

机译：液体石蜡/ Al2O3纳米流体的流变行为研究：实验方法

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摘要

Liquid paraffin can be used as a coolant fluid in electronic and cutting devices due to its suitable capabilities such as electrical insulating, high heat capacity, chemical, and thermal stability, and high boiling point. In this study, the dynamic viscosity of paraffin containing the alumina nanoparticles has been examined experimentally. The nanofluids with different composition of alumina (0, 1, 2, and 3%) with the diameter of 20 nm were prepared by two-step method and tested by professional Brookfield rheometer in the temperature range of 20 oC to 60 oC and the shear rates of 12 s-1 up to 200 s-1. Experimental results indicated that the nano-lubricant behaves as Newtonian fluid in the volume fraction of 0 and 1% only at the temperatures of 50 and 60?oC. While it behaves as non-Newtonian fluid in the volume fraction of 2 and 3% for all measured temperatures. The results showed that the power law model represents the best curve fitting of the experimental data. Therefore, the coefficient values of power-law model including, consistency index and flow index were reported. Finally, an equation of relative viscosity based on the volume fraction and temperature of the combination was proposed by applying the curve fit technique on the experimental data.
机译：液体石蜡由于具有适当的功能，例如电绝缘，高热容量，化学和热稳定性以及高沸点，因此可以用作电子和切割设备中的冷却液。在这项研究中，已对含氧化铝纳米颗粒的石蜡的动态粘度进行了实验研究。通过两步法制备了直径为20 nm的氧化铝组成不同的纳米流体（0、1、2和3％），并通过专业的Brookfield流变仪在20 oC至60 oC的温度范围内进行了测试，并进行了剪切速率从12 s-1到200 s-1。实验结果表明，仅在50和60°C的温度下，纳米润滑剂在体积分数为0和1％时才起牛顿流体的作用。对于所有测得的温度，其表现为非牛顿流体，其体积分数为2％和3％。结果表明，幂律模型代表了实验数据的最佳曲线拟合。因此，报告了幂律模型的系数值，包括一致性指标和流量指标。最后，通过将曲线拟合技术应用于实验数据，提出了基于体积分数和温度的相对粘度方程。

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