In this paper, the impact of the magnetic field on the viscosity of La_0.6 Sr_0.4 MnO₃/water magnetic nanofluid is studied from the experimental point of view. These experiments were carried out in the two following conditions: temperature range of 10–50 °C and the volume fraction of 0–1%. The results showed that with increase in the volume fractions of nanoparticles, the viscosity of the sample increased. Moreover, with increase in the temperature, viscosity decreased in both conditions of the presence and absence of the magnetic field. Furthermore, the viscosity of the magnetic nanofluid increased by increasing the magnetic field. It is therefore concluded that the magnetic field is an effective factor in the viscosity of the magnetic nanofluids, by which magnetic nanofluid flow will be controllable.

中文翻译：

---

磁场作用下La 0.6 Sr 0.4 MnO 3 /水纳米流体的粘度研究

本文研究了磁场对La _0.6 Sr _0.4 MnO ₃粘度的影响从实验的角度研究了水/磁性纳米流体。这些实验在以下两个条件下进行：温度范围为10–50°C，体积分数为0-1％。结果表明，随着纳米颗粒体积分数的增加，样品的粘度增加。而且，随着温度的升高，在存在和不存在磁场的两种情况下，粘度都降低。此外，磁性纳米流体的粘度通过增加磁场而增加。因此得出结论，磁场是磁性纳米流体的粘度的有效因素，通过该因素可以控制磁性纳米流体的流动。