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Influence of surface oxidation on electric potential measurements in MHD liquid metal flows |
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| Affiliation: | 1. Graduate School of Science, Shizuoka University, Shizuoka, Japan;2. National Institute for Fusion Science, Gifu, Japan;3. Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan;4. Graduate School of Engineering, Hokkaido University, Sapporo, Japan;5. Department of Material Science, Shimane University, Matsue, Shimane, Japan;6. Hydrogen Isotope Research Center, University of Toyama, Toyama, Japan;1. Open Joint-Stock Company “N.A. Dollezhall Research and Development Institute of Power Engineering”, (OJSC “NIKIET”), 107140, Malaya Krasnoselskaya 2/8, Moscow, Russian Federation;2. D.V. Efremov Scientific Research Institute of Electrophysical Apparatus, 196641 St. Petersburg, Russian Federation;1. National Fusion Research Institute, Daejeon, Republic of Korea;2. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;1. Korea Atomic Energy Research Institute, Republic of Korea;2. National Fusion Research Institute, Republic of Korea;1. CEA, DEN, Saclay, DM2S, SERMA, F-91191 Gif-sur-Yvette, France;2. Incka, 19-21 Rue du 8 mai 1945, F-94110 Arcueil, France |
| Abstract: | Experimental investigations for magnetohydrodynamic flows in rectangular ducts are performed using GaInSn as model fluid. Measurements of electric potential on channel walls and inside the flow show reproducible discrepancies compared to analytical results. These discrepancies can be ascribed to the formation of oxide layers causing a contact resistance between the electrically conducting duct walls and the liquid metal. An exact analytical solution for pressure drop, velocity and potential distributions has been derived taking into account the presence of a contact resistance. Analytical results for velocity and potential profiles and for pressure drop are discussed for different values of contact resistance and strength of the applied magnetic field. A comparison of measured potential with data from the analytical solution allows estimating the order of magnitude of the contact resistance in the present experiments. |
| Keywords: | Magnetohydrodynamics (MHD) Liquid metals Contact resistance Surface oxidation |
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