采用振动盘黏度计对低密度区二甲醚的气相黏度进行了实验研究,温度范围为299～396 K、压力范围为0.1～1.2MPa,黏度测量的不确定度为±2.0%。利用实验数据,将摩擦理论与PR方程结合建立了二甲醚的黏度模型,黏度实验数据与模型的绝对平均偏差为0.40%,最大偏差为1.32%,可以满足工程应用。 Vibrating disk viscometer was used to study the gas phase viscosity of DME in the low density range. The temperature range was 299 ~ 396 K, the pressure range was 0.1 ~ 1.2 MPa, and the uncertainty of viscosity measurement was ± 2.0%. Using the experimental data, the viscosity model of DME was established by combining the friction theory and PR equation. The absolute mean deviation between the experimental data and the model was 0.40% and the maximum deviation was 1.32%, which could meet the engineering application.