In this work, a double-cylinder viscometer is designed to measure dynamic viscosity over a pressure range from atmospheric pressure up to 150 MPa and a temperature range of 278.15–333.15 K. A high-pressure closed cavity is designed innovatively and the magnetic coupling is adopted to transfer the torque to reduce the friction; the inner cylinder with ruby bearing is designed to reduce the friction torque, thus the accuracy of the viscosity measurement is improved. The experiment of measuring the standard viscosity liquid (N10 and N35) under normal pressure and measuring the viscosity of methylbenzene under the pressure of 0.1–150 MPa were carried out, and considering all the experimental data, the uncertainty of the viscosity measurements is approximately ±3%.

中文翻译：

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高压液体双缸粘度计的设计

在这项工作中，设计了双缸粘度计，用于测量大气压至 150 MPa 压力范围和 278.15-333.15 K 温度范围内的动态粘度。创新设计了高压封闭腔，磁耦合采用传递扭矩，减少摩擦；内筒采用红宝石轴承设计，减少摩擦力矩，提高粘度测量精度。进行了常压下测量标准粘度液体（N10和N35）和0.1-150 MPa压力下测量甲苯粘度的实验，综合考虑所有实验数据，粘度测量的不确定度约为± 3%。