The effect of flow pulsations on coriolis mass flow meters

It has been reported that the accuracy of Coriolis mass flow meters can be adversely affected by the presence of pulsations (at particular frequencies ) in the flow. A full analysis of the transient performance of a commercial Coriolis meter is only possible using finite element techniques. However, this is a transient, nonlinear problem in which the space and time variable s are not (strictly) separable and the finite element techniques for tackli ng such problems make it desirable to have an analytical solution for a sim plified meter, against which the finite element solution can be compared. T his paper reports such a solution. The solution will also provide guidance for experiments. Existing analytical solutions for the performance of Corio lis meters in steady flow (a complex eigenvalue problem) are not easily ext ended to the transient flow case. The paper thus begins with the presentati on of an alternative solution for steady how through a simple, straight tub e, Coriolis meter and it is notable that this solution gives a simple analy tical expression for the experimentally observed small change in the resona nt frequency of the meter, with flow rate, as well as an analytical express ion for the meter sensitivity. The analysis is extended to the transient ca se, using classical, forced vibration, modal decomposition techniques. The solution shows that, unlike the steady flow case where the detector signals contain components at the drive frequency and the second mode frequency (C oriolis frequency), for pulsatile flow the detector signals will in general contain components involving at least four frequencies. It is demonstrated that the meter error depends on the algorithm used to estimate the phase d ifference from the detector signals. The particular flow pulsation frequenc ies which could possibly lead to large meter errors are identified. (C) 199 8 Academic Press.