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1 Publication3-D shape and velocity measurement of argon gas bubbles rising in liquid sodium by means of ultrafast X-ray CT imaging
Bieberle, M.; Gundrum, T.; Räbiger, D.; Bieberle, A.; Eckert, S.
We present an evaluation study on the characterization of bubbles rising in liquid sodium by applying two-plane ultrafast X-ray computed tomography (UFXCT). It includes a new method for determining the three-dimensional shape and velocity vector of each individual bubble. In the experimental part, argon gas was injected through a single nozzle located slightly above the bottom of a cylindrical vessel filled with liquid sodium. The gas flow rate was varied between 10 and 635 cm3/min to obtain a chain of individual bubbles. In this parameter range, collisions of bubbles, coalescence or breakup are not expected. Measurements were carried out in a wide spatial range starting near the nozzle up to a height of about 200 mm above it. It was convincingly demonstrated that two-plane UFXCT imaging, in combination with the data processing presented here, allows a reliable characterization of the size, shape and velocity of bubbles with a size of a few millimeters in a sodium column of 54 mm diameter. Observed experimental results include a reproducible fluctuation of shape, position and velocity in the lower part of the column as well as lower terminal rise velocities compared to bubble chains in water.
Keywords: argon; liquid sodium; gas-liquid two-phase flow; ultrafast X-ray computed tomography; bubble charact
Involved research facilities
- TOPFLOW Facility
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Flow Measurement and Instrumentation 95(2024), 102503
Online First (2023) DOI: 10.1016/j.flowmeasinst.2023.102503
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- Secondary publication expected from 02.12.2024
Permalink: https://www.hzdr.de/publications/Publ-37535