Abstract
For Coriolis flowmeters, their flow sensor is essentially an oscillating pipe section conveying the metered fluid. Its working principle is based on the Coriolis force generated when the fluid passes through the vibrating tube. Coriolis flowmeters have some well-known advantages such as high accuracy and large measuring range. However, if the process pressure and temperature change significantly, it will affect the measurement accuracy. This paper proposes a numerical method to explore the mechanism of the influence of high-pressure fluid on the measurement accuracy of Coriolis flowmeters, and experimentally verified the method. By analyzing the deviation of the natural frequency and phase difference of the measuring tube under different pressures, this method can predict the pressure effects on the sensitivity of measuring tubes with different inclination angles. Through the analysis of the total deformation of the measuring tube, the influence mechanism of the high-pressure fluid on Coriolis flowmeters is further investigated. The numerical method can be used to optimize the measuring tube design and reduce the pressure effects on measurement accuracy.
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