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Micro-Scale Flow Excitation under Imposition of Uniform Magnetic Field and Electrical Current
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Version 1
: Received: 17 October 2022 / Approved: 19 October 2022 / Online: 19 October 2022 (07:00:10 CEST)
A peer-reviewed article of this Preprint also exists.
Xu, G.; Iwai, K. Micro-Scale Flow Excitation under Imposition of Uniform Magnetic Field and Electrical Current. Metals 2022, 12, 2034. Xu, G.; Iwai, K. Micro-Scale Flow Excitation under Imposition of Uniform Magnetic Field and Electrical Current. Metals 2022, 12, 2034.
Abstract
Mass transfer is often the rate determining step for solid-liquid chemical reactions. Decrease of the concentration boundary layer thickness is essential to intensify the chemical reaction. Because the concentration boundary layer exists in the velocity boundary layer, force imposition in the concentration boundary layer by superimposing an electrical current and a magnetic field was proposed. Through, flow can be directly excited in the concentration boundary layer. The previous result indicates that by superimposing a DC current and a gradient magnetic field, the development of the concentration boundary layer was suppressed, because of a macro-scale flow excitation in the whole vessel. And by superimposing the gradient magnetic field with a modulate current, the development of the concentration boundary layer was further suppressed. This is because of the macro-scale flow enhancement and the excitation of a micro-scale flow near the solid-liquid interface. However, the mechanism for the micro-scale flow excitation has not been clarified. To clarify this, a uniform magnetic field was superimposed with the DC current or the modulate current. By this means, only the micro-scale flow was excited near the anode surface. The results found that the non-unform electromagnetic force distribution is the main reason for the micro-scale flow excitation.
Keywords
mass transfer; micro-scale flow; diffusion; convection
Subject
Chemistry and Materials Science, Metals, Alloys and Metallurgy
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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