Yang Qiu-Yi, Jin Ning-De, Zhai Lu-Sheng, Ren Ying-Yu, Yu Chuang, Wei Ji-Dong
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China.
Sensors (Basel). 2020 May 31;20(11):3122. doi: 10.3390/s20113122.
A method to measure the superficial velocity of the water phase in gas-water flow using an electromagnetic flowmeter (EMF) and rotating electric field conductance sensors (REFCSs) is introduced in this paper. An electromagnetic flowmeter instrument factor model is built and the correlation between electromagnetic flowmeter output and gas holdup in different flow patterns are explored through vertical upward gas-water flow dynamic experiments in a pipe with an inner diameter (ID) of 20 mm. Water superficial velocity is predicted based on pattern identification among bubble, churn, and slug flows. The experimental results show that water superficial velocity can be predicted fairly accurately for bubble, churn, and slug flows with a water cut higher than 60% (absolute average percentage deviation and absolute average deviation are 4.1057% and 0.0281 m/s, respectively). The output of the electromagnetic flowmeter is unstable and invalid in slug flows with a water cut below 60% due to the non-conducting gas slug is almost filling the pipe. Therefore, the electromagnetic flowmeter is not preferred to be used in such conditions.
本文介绍了一种利用电磁流量计（EMF）和旋转电场电导传感器（REFCSs）测量气-水两相流中液相表观速度的方法。建立了电磁流量计仪表系数模型，并通过内径为20mm的管道内垂直向上的气-水流动态实验，探讨了电磁流量计输出与不同流型中气含率之间的相关性。基于泡状流、 churn流和段塞流的流型识别来预测水相表观速度。实验结果表明，对于含水率高于60%的泡状流、 churn流和段塞流，水相表观速度能够得到较为准确的预测（绝对平均百分比偏差和绝对平均偏差分别为4.1057%和0.0281m/s）。由于含水率低于60%的段塞流中不导电的气段几乎充满管道，电磁流量计的输出不稳定且无效。因此，在这种情况下不建议使用电磁流量计。
