Interfacial area concentration (IAC) and bubble size distribution (BSD) are two important parameters in two-phase flow simulations. High-speed tomography techniques, mainly including wire-mesh sensor and ultrafast X-ray imaging in this stage, are advanced measurement devices, which can measure the instantaneous phase distribution in the cross-section with high spatial resolution. In previous studies, IAC and BSD can be estimated by the tomography measurement data. However, the estimated value of the IAC or BSD is not satisfied in some conditions like flows with low superficial liquid velocity. In this study, the methods of estimating IAC and BSD based on tomography measurement were developed, which is independent of the superficial liquid velocity. The new methods use the area surrounded by every four measurement pixels as the control volume, which has a small thickness. The thickness of the control volume is the product of interfacial velocity and the time of single frame imaging. The local instantaneous IAC and BSD for each control volume was calculated. The time-area-averaged parameters can be calculated by averaging the local instantaneous ones. For the time-volume-averaged parameters, it can be calculated by integrating the time-area-averaged parameters at multiple axial positions. An ideal bubbly flow data with pre-defined IAC and BSD was used to verify the new methods. The measurement results from the new methods and the old methods were also compared with each other.

界面面积浓度 (IAC) 和气泡尺寸分布 (BSD) 是两相流模拟中的两个重要参数。这一阶段主要包括线网传感器和超快X射线成像的高速断层扫描技术是先进的测量设备，可以以高空间分辨率测量横截面的瞬时相位分布。在以往的研究中，IAC 和 BSD 可以通过断层扫描测量数据来估计。然而，IAC 或 BSD 的估计值在某些条件下不满足，例如低表观液体速度的流动。在这项研究中，开发了基于断层扫描测量估计 IAC 和 BSD 的方法，该方法与表观液体速度无关。新方法使用每四个测量像素包围的区域作为控制体积，它的厚度很小。控制体积的厚度是界面速度和单帧成像时间的乘积。计算每个控制体积的局部瞬时 IAC 和 BSD。时域平均参数可以通过对局部瞬时参数求平均来计算。对于时间体积平均参数，可以通过对多个轴向位置的时间面积平均参数进行积分计算。使用具有预定义 IAC 和 BSD 的理想气泡流数据来验证新方法。新方法和旧方法的测量结果也相互比较。时域平均参数可以通过对局部瞬时参数求平均来计算。对于时间体积平均参数，可以通过对多个轴向位置的时间面积平均参数进行积分计算。使用具有预定义 IAC 和 BSD 的理想气泡流数据来验证新方法。新方法和旧方法的测量结果也相互比较。时域平均参数可以通过对局部瞬时参数求平均来计算。对于时间体积平均参数，可以通过对多个轴向位置的时间面积平均参数进行积分计算。使用具有预定义 IAC 和 BSD 的理想气泡流数据来验证新方法。新方法和旧方法的测量结果也相互比较。