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Lateral forces on a magnet falling in a conducting pipe

Abstract : Purpose — The purpose of this paper is to investigate the lateral forces during the fall of a magnet in a conducting pipe, when the direction of magnetization of the magnet is fixed. If the direction of magnetization is not parallel to the axis of the pipe, lateral forces occur and a decentration of the magnet happens. Design/methodology/approach — The problem is studied numerically, with a T − h 3D FE formulation well-suited for the problem. Computational results are compared with experimental results. Findings — The physical model is given and the main force coefficients analyzed. The lateral forces and the decentration phenomenon are studied as a function of the main parameters (thickness and radius of the pipe). Originality/value — The direction of magnetization is a key parameter to analyze the dynamics of a magnet motion inside a conducting pipe, when the radii of the pipe and the magnet are not so close. This analysis with a fixed direction of magnetization allows to quantify the lateral forces and the decentration, and is a first step to understand the complete motion which includes the rotation which can be linked to the decentration.
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Stéphane Dufour, Gérard Vinsard, J.-P Brancher. Lateral forces on a magnet falling in a conducting pipe. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Emerald, 2012, 31 (6), pp.1625-1636. ⟨10.1108/03321641211267038⟩. ⟨hal-01498925⟩

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