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

J. Liu, T. Wang, Y. Yan, X. Wang

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.

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DOI

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IMEKO TC

TC9 - Flow Measurement

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