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

Abstract

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 T ransient Tw o-P hase Flow (TOPFLOW) facility at Helmholtz-Zentrum Dresden – Rossendorf (HZDR) using ultrafast electron beam X-ray tomography (UFXRAY). In this study, flow obstacles were installed into a pipe to create a generic three-dimensional flow field as an advanced test case for CFD codes. UFXRAY provide valueable data of the gas phase dynamics with high temporal and spatial resolution. The provided data set contains tomography raw-data for the experimental series L30 that uses a ring shaped flow obstacle with a blockage ratio of 0.5. For visualization, the data might be opend with Fiji. Therefore choose Import->Raw... In the following window specify Image type as 16-bit Unsigned, Width as 288 pixels and Height as 500 pixels for 2x1000Hz measurement or 200 pixels for 2x2500Hz measurement. Make sure that Little-endian byte order is checked. A data set contains image frames of both scvanning planes in alternating order. Therefore, if only a single scanning plane is required, the offset and gap parameters need to be set to 288000 bytes for 2x1000Hz measurement or 115200 bytes for 2x2500Hz measurement.