Study on Pressure Effect of V-shaped Tube Coriolis Flowmeters

Coriolis flowmeter is well-known for its high accuracy and wide measurement range. However, most Coriolis flowmeters operating at a pressure which differs from the original calibration pressure requires compensation else significant measurement errors will occur. Pressure compensation coefficients vary with manufacturer, meter geometry and sensor material. It is difficult to explore the mechanism of Coriolis flowmeters under the influence of pressure by existing experimental methods. This paper proposes a new way that combines finite element simulation with mathematical modeling to explore the fundamental reasons behind the impact of high-pressure fluid on Coriolis flowmeter's accuracy. Numerical simulations were conducted on two different sizes of Coriolis flowmeters, revealing consistent trends in measurement variations with pressure increase. The mechanics analysis of V-shaped bent tube Coriolis flowmeter is carried out, and its coefficient calculation formula is derived. By combining mathematical model with simulation, this study offers theoretical guidance for designing a Coriolis flowmeter tube structure that is inherently less sensitive to high-pressure fluid conditions.