In this work, we propose a conductivity-based single-layer wire-mesh sensor (WMS) system to simultaneously measure the planar bubble distribution, equivalent diameter, and rise velocity of micro-to-millimeter sized bubbles in a gas-liquid two-phase flow. Compared with the conventionally available WMS system, the proposed system is capable of simultaneously measuring the bubble size and velocity using a single-layer sensor by establishing the correlation between the effective time taken for the bubble to pass through the sensor wires and its rise velocity, which is validated for micro-to-millimeter sized bubbles. Using this correlation, we have improved the recursive bubble identification method to develop a nonlinear model for bubble size, making it possible to selectively measure and distinguish between the bubbles in micro-to-millimeter scales (previous sensors were validated for large bubbles only). To accomplish this, we also investigated the differences in the dynamics of bubble-wire contact in detail. In a vertical upward bubbly flow, the present sensor was employed for a wide range of bubble sizes ($200\mu$m to 3.5 mm on average) and liquid velocity of $0-0.5$ m/s; the measured data were in good agreement with those measured with a high-speed shadowgraphy. Finally, we discuss some issues of the proposed system, which requires a further attention.

在这项工作中，我们提出了一种基于电导率的单层金属丝网传感器（WMS）系统，以同时测量气液两相流中微气泡至毫米尺寸气泡的平面气泡分布，当量直径和上升速度。相流。与传统上可用的WMS系统相比，该提议的系统能够通过建立气泡通过传感器导线的有效时间与其上升速度之间的相关性，使用单层传感器同时测量气泡的大小和速度，已针对微米到毫米大小的气泡进行了验证。利用这种相关性，我们改进了递归气泡识别方法，以开发气泡尺寸的非线性模型，使得有可能选择性地测量和区分微毫米级的气泡（以前的传感器仅针对大气泡进行过验证）。为此，我们还详细研究了气泡线接触动力学的差异。在垂直向上的气泡流中，本传感器用于各种气泡尺寸（$200\mu$平均m到3.5 mm）和液体速度 $0-0.5$ 多发性硬化症; 测得的数据与用高速阴影照相法测得的数据非常吻合。最后，我们讨论了拟议系统的一些问题，需要进一步关注。