Predicting the Output Error of a Coriolis Flowmeter under Gas-Liquid Two-Phase Conditions through Analytical Modelling

• Abstract:

  Coriolis flowmeters are recognised to give excellent performance of the mass flow measurement and independent density measurement of single-phase flow. However, the large measurement error of a Coriolis flowmeter under gas-liquid two-phase flow conditions makes it unsuitable for many industrial processes where gas-liquid two-phase flow is encountered. Although analytical models have been proposed to explain the reasons behind the large output error of a Coriolis flowmeter under two-phase conditions, none of the individual theories nor their combinations can match experimental results to within 10% difference. In particular, when the gas volume fraction (GVF) exceeds 15%, the existing analytical models are not suitable. In this paper, a semiempirical analytical model is established by combining existing analytical models with empirical terms and coefficients. The applicable range of this new analytical model is now extended to up to 40% GVF, which also better matches the experimental results. Comparisons between the modelling predictions and the experimental results for air-water two-phase flow on a two-inch Coriolis flowmeter (KROHNE OPTIMASS 6000) are made. Comparisons indicate that 2314 out of 2457 (94.2%) modelling predictions in mass flowrate fall within 10% relative error while 2403 out of 2457 (97.8%) predictions in GVF measurements fall within 5% absolute error. The outcome of this research contributes to an analytical approach to predict output error of Coriolis flowmeters under gas-liquid two-phase flow with improved accuracy and extended GVF range.
• Keywords:
• Download:

  IMEKO-TC9-2019-094.pdf
• DOI:

  _unreg_tc9-2019.094

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