A multiphase flow measurement technique plays a critical role in the studies of heat and mass transfer characteristics and mechanism of the gas–liquid two-phase, the practical measurement of the gas–liquid flow and the improvement of multiphase theoretical models. The four-sensor electrical probe as an emerging measurement method has been proved to be able to get the local flow parameters of multi-dimensional two-phase flow. However, few studies have been reported using the four-sensor probe to obtain the interface information (e.g., the interface direction and velocity). This paper presents a new signal processing method by which the interface direction and velocity can be obtained, besides void fraction, interfacial area concentration (IAC) and bubble chord length. The key solution is to employ the vector-based calculating method, which possesses the merits of simplicity and efficiency, to gain the interface velocity vector through legitimately assuming a direction of the interface velocity. A miniaturized four-sensor electrical probe was made and a gas–liquid two-phase flow experiment was performed to test the proposed signal process scheme. The two-phase flow was controlled to be in cap-bubble flow regime. To validate the availability and reliability of the proposed method, the local flow parameters obtained by the probe measurement were compared with the results from visual measurement technique in the same flow conditions. The comparison indicates that the above local flow parameters from four-sensor probe measurement are in good agreement with the visual measurement results, with maximum deviations of chord length of 8.7%, thereby proving the correctness of the proposed method.

中文翻译：

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基于矢量的四传感器探头信号处理新方法，用于测量气液两相局部流动参数及其对单泡流动的评估

多相流测量技术在气液两相的传热和传质特性及机理研究，气液两相流的实际测量以及多相理论模型的改进方面起着至关重要的作用。四传感器电探针作为一种新兴的测量方法，已被证明能够获得多维两相流的局部流量参数。然而，很少有研究报道使用四传感器探针来获得界面信息（例如，界面方向和速度）。本文提出了一种新的信号处理方法，除了空隙率，界面面积浓度（IAC）和气泡弦长以外，还可以获取界面方向和速度。关键解决方案是采用基于向量的计算方法，具有简单和高效的优点，通过合理地假定界面速度的方向来获得界面速度向量。制作了一个小型的四传感器电探针，并进行了气液两相流动实验以测试所提出的信号处理方案。将两相流控制在帽泡流状态。为了验证所提方法的有效性和可靠性，将在相同流量条件下通过探头测量获得的局部流量参数与视觉测量技术的结果进行了比较。比较表明，上述四传感器测头的局部流量参数与目测结果吻合良好，弦长最大偏差为8.7％，