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Tytuł:
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Perturbation of eddy-currents by one inclusion in liquid metal.
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Autorzy:
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Guichou, R.
Ayroles, H.
Zamansky, R.
Bergez, W.
Tordjeman, Ph.
Paumel, K.
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Temat:
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EDDY currents (Electric)
PERTURBATION theory
LIQUID metals
ELECTRIC potential
REYNOLDS number
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Źródło:
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Journal of Applied Physics; 2019, Vol. 125 Issue 9, pN.PAG-N.PAG, 6p, 1 Diagram, 6 Graphs
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In this article, we present an analytical model to calculate the perturbation of the magnetic vector potential due to a non-conducting inclusion in a liquid metal translated at constant velocity. The model is valid for a low magnetic Reynolds number, R e m , and a low shielding parameter, S ω. We establish that the first order perturbation of the vector potential can be directly obtained from the value of the unperturbed eddy-current calculated at the location of the inclusion. An ECFM (Eddy-Current FlowMeter) device has been designed to validate the model and to study the frequency effects of the eddy-current and the volume of one inclusion and its location. We observe a good agreement between the model predictions and experimental data within the limit of the validity of the model. Based on scaling analysis, we show that a unique relation exists between the perturbation of the emf (electromotive force) measured with the ECFM and the volume of the inclusion and its location, which reflects the self-similarity of the model solution. [ABSTRACT FROM AUTHOR]
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