Due to their high accuracy, Coriolis flowmeters are widely used in industry for mass flow and density measurement of single-phase liquids or gases. However, the accuracy decreases if a second phase is mixed with the processed liquid. Especially gas bubbles can cause errors. To explain this phenomenon, the "bubble theory" was proposed by Grumski et al. [1] and Hemp et al. [2]. However, this theory only explains negative density and mass flow errors and can not explain positive errors observed in experiments. Furthermore, according to this theory, density and mass flow errors are directly coupled, which is not the case in practice. Fig. 1 shows the typical behaviour of a Coriolis flowmeter. Besides the "bubble theory" there must be other significant effects that influence the measurement accuracy. The moving resonator model introduced in this paper can explain these effects.
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