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- W2120946959 abstract "The intention of the “von Kármán sodium” (VKS) experiment is to study the hydromagnetic dynamo effect in a highly turbulent and unconstrained flow. Much effort has been devoted to the optimization of the mean flow and the lateral boundary conditions in order to minimize the critical magnetic Reynolds number Rmc and hence the necessary motor power. The main focus of this paper lies on the role of “lid layers”, i.e. layers of liquid sodium between the impellers and the end walls of the cylinder. First, we study an analytical test flow to show that lid layers can have an ambivalent effect on the efficiency of the dynamo. The critical magnetic Reynolds number shows a flat minimum for a small lid layer thickness, but increases for thicker layers. For the actual VKS geometry it is shown that static lid layers yield a moderate increase of Rmc by approximately 12 per cent. A more dramatic increase by 100 till 150 per cent can occur when some rotational flow is taken into account in those layers. Possible solutions of this problem are discussed for the real dynamo facility." @default.
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- W2120946959 date "2006-11-01" @default.
- W2120946959 modified "2023-09-25" @default.
- W2120946959 title "Ambivalent effects of added layers on steady kinematic dynamos in cylindrical geometry: application to the VKS experiment" @default.
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- W2120946959 doi "https://doi.org/10.1016/j.euromechflu.2006.02.002" @default.
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