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International Society for Industrial Process Tomography

11th World Congress on Industrial Process Tomography

Current Tomography - Localization of void fractions in conducting liquids by measuring the induced magnetic flux density

L. Krause1*, N. Kumar2, T. Wondrak1, S. Gumhold2, S. Eckert1, K. Eckert1,3

1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany

2Computer Graphics and Visualization, Faculty of Computer Science, Technische Universität Dresden, Germany

3Transport Processes at Interfaces, Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Germany

*Email: l.krause@hzdr.de


ABSTRACT

A novel concept of a measurement technology for the localization and determination of the size of gas bubbles is presented, which is intended to contribute to a further understanding of the dynamics of efficiency-reducing gas bubbles in electrolyzers. A simplified proof-of-concept (POC) model is used to numerically simulate the electric current flow through materials with significant differences in electrical conductivity. Through an automated approach, an extensive data set of electric current density and conductivity distributions is generated, complemented with determined magnetic flux densities in the surroundings of the POC cell at virtual sensor positions. The generated data set serves as testing data for various reconstruction approaches. Based on the measurable magnetic flux density, solving Biot-Savart’s law inversely is demonstrated and discussed with a model-based solution of an optimization problem, of which the gas bubble locations are derived.


Keywords: current tomography, magnetic field measurement, current density distribution, inverse problem

Industrial Application: water electrolysis

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