高温高压振动丝黏度仪的研制

Development of Vibrating-Wire Viscometer on High Pressure and High Temperature

在振动丝技术的基础上,设计和制造出一种黏度仪,其工作原理是将截面为圆形的振动丝浸在待测液体中,然后让振动丝进行垂直于中心轴线的横向振动,从而测定流体的黏度和密度,写出了相应的工作方程,并对振动丝黏度仪的设计和操作过程进行了描述.振动丝黏度仪主要包括振动丝传感器、温度控制系统、压力控制系统和信号调节系统.确定了仪器的操作参数,测定了正己烷在298.15～403.15 K、0.10 MPa和5.1 MPa两个压力条件下的黏度和密度.比较实验数据和文献数据可知,本仪器测量密度时测量误差小于±0.5%,测量黏度时的测量精度为±0.5%,测量误差在±2.0%以内.目前该仪器已经用于高温高压液体黏度和密度的测定.

Vibrating-wire technique has been applied to design a viscometer for precise measurements density and viscosity. The theory and work equation for viscometer based upon the principle of a circular-section rod, immersed in a fluid and, performing transverse oscillations perpendicular to its axis, were presented. The (design) and operation process of vibrating-wire viscometer were described. It was mainly composed of the (vibrating) sensor, the temperature control system, the pressure control system, and the signal adjust system. The instrumental parameters were determined. The viscosity and density of hexane in the temperature range 298.15 K to 403.15 K, at pressure 0.10 MPa and 5.1 MPa were measured. The measured results of density of hexane were compared with literature values. The error of density confirmed with the measurement of hexane (is ±0.5~0_0.) The viscosities have precision of ±0.5~0_0 and an error of ±2.0~0_0.Now it has been used to measure density and viscosity of fluid on high temperature and high pressure.