An investigation of effects of flow conditioning on straight tube Coriolis meter

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Title: An investigation of effects of flow conditioning on straight tube Coriolis meter
Author: Shukla, Shashank
Abstract: Coriolis meter , despite being very accurate in single phase conditions , fails to accurately measure two -phase flows . It poses a complex fluid -structure interaction problem in case of two -phase operation ; there is a scarcity of theoretical models available to predict the errors reported by Coriolis meter in aforementioned conditions , hence the need for experimental research . Experiments are conducted in both single and two -phase flow conditions . Meter accuracy is excellent in single phase conditions and no significant effect is observed on use of flow conditioners , namely inlet swirl and inline mixer . Operational two -phase envelope is determined through experiments at different flowrates . Flow conditioners are used to study the effect of phase segregation and homogenization on accuracy of the meter . Testing is done to cover two -phase flows from both extreme ends , namely aerated liquids and wet gas . Use of flow conditioners show slight improvement in meter accuracy on use of inline mixer , and reduction in accuracy in case of inlet swirl , when both former and latter are compared to results obtained from experiments with no flow conditioners . The difference in accuracies between results with flow conditioner and without flow conditioners is attributed to relative motion between the phases , which is more in case of inlet swirl , due to larger bubble sizes . Flow conditioners show an insignificant effect on meter accuracy during wet gas tests . The reason proposed is annular flow regime , which is not highly affected by flow conditioners . Single phase tests demonstrate that Coriolis meter gives accurate measurement even in presence of severe flow disturbances . There is no need for flow conditioning before the meter to obtain accurate readings from it , which would be the case in other metering technologies like orifice and turbine . In two phase flows , the meter reports negative errors , which is consistent with previous experimental works available in literature . Use of flow conditioners clearly affects the reading of the meter in aerated liquids . This phenomenon can be used to get fairly accurate estimate of flow rate in low gas volume fraction liquid flows .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2807
Date: 2009-05-15

Citation

An investigation of effects of flow conditioning on straight tube Coriolis meter. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2807 .

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