Abstract This study aims to evaluate the effect of the concentration of multi-wall carbon nanotubes (MWCNTs)/ turbine meter oil nanofluids on thermophysical attributes of lubricants, including the viscosity index, kinematics viscosity, flash point, pressure drop, and friction factor. The results indicated that the viscosity of pure lubricant was enhanced with the addition of MWCNTs and increased with decreasing temperature. The viscosity index at a concentration of 0.3 wt% was increased by 2.43%. The flash point temperature at concentrations of 0.3 wt% and 0.4 wt% was increased by 4.4%. Experiments were conducted to obtain the pressure drop data and friction factor. The friction factor increased for all concentrations of MWCNTs in pure oil; the highest increment in the friction factor, with the addition of 0.3 wt% nanoparticles to pure oil in 0.069 m/s inlet velocity, was 10.41%. The mean deviation between the experimental friction factor and simulation friction factor was 0.029.

中文翻译：

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多壁碳纳米管/涡轮流量计油纳米流体浓度对润滑油热物理性能的影响

摘要 本研究旨在评估多壁碳纳米管（MWCNTs）/涡轮流量计油纳米流体的浓度对润滑油热物理属性的影响，包括粘度指数、运动粘度、闪点、压降和摩擦系数。结果表明，纯润滑剂的粘度随着多壁碳纳米管的加入而增加，并随着温度的降低而增加。0.3wt%浓度下的粘度指数增加了2.43%。浓度为 0.3 wt% 和 0.4 wt% 时的闪点温度提高了 4.4%。进行实验以获得压降数据和摩擦系数。纯油中所有浓度的 MWCNTs 的摩擦系数都增加；摩擦系数的最大增量，在 0.3% 的纯油中添加 0.3 wt% 的纳米颗粒。069 m/s 入口速度，为 10.41%。实验摩擦系数和模拟摩擦系数之间的平均偏差为0.029。