Ultrafast X-ray tomography image data of bubbly two-phase pipe flow around a ring-shaped constriction

For the investigation of bubbly two-phase flow, which should serve as a future benchmark experiment for CFD code validation, an experimental study has been conducted at the <strong>T</strong>ransient Tw<strong>o-P</strong>hase <strong>Flow</strong> (TOPFLOW) facility at Helmholtz-Zentrum Dresden – Rossendorf (HZDR) using ultrafast electron beam X-ray tomography (UFXRAY). In this study, flow constrictions were installed into a DN50 pipe to create a generic three-dimensional flow field as an advanced test case for CFD codes. UFXRAY CT scans were performed in dual-imaging mode and 9 imaging planes for 15 s with a temporal resolution of 1.0 kHz and 2.5 kHz to provide valuable data of the gas phase dynamics.

The provided data set contains tomographic image data for the experimental series L32 that uses a <strong>ring-shaped</strong> flow constriction with a blockage ratio of 0.5. Here, all image stacks for a given operating point are stored in a single HDF5 file with a spatial resolution of 0.5 mm/pixel (Images are stacked as time series). Further attributes (e.g. reconstruction parameters) are available for each image stack and are accessible e.g. using Matlab or Octave. The relative distance of the each respective scanning position is defined in an additional info.txt.

为开展泡状两相流研究（该研究拟作为未来计算流体动力学（CFD）代码验证的基准实验），研究人员在亥姆霍兹德累斯顿-罗森多夫中心（HZDR）的瞬态两相流（TOPFLOW）实验装置上，采用超快电子束X射线断层扫描技术（UFXRAY）完成了一项实验研究。本研究在DN50管道内安装流动收缩段，以构建通用三维流场，作为CFD代码的高级测试案例。研究采用双成像模式进行UFXRAY CT扫描，覆盖9个成像平面，持续15秒，时间分辨率分别为1.0 kHz和2.5 kHz，旨在获取气相动力学的宝贵数据。

所提供的数据集包含实验系列L32的断层成像数据，该系列采用阻塞比为0.5的环形流动收缩段。每个操作点对应的所有图像栈均存储于单个HDF5文件中，空间分辨率为0.5 mm/像素（图像按时间序列堆叠）。每个图像栈还附带重构参数等属性，可通过Matlab或Octave等工具访问。各扫描位置的相对距离在附加文件info.txt中定义。