Non-Magnetic Solid Body in Ferrofluid Containers: Wall Effects

Abstract Experimental and numerical investigations of a magnetic ponderomotive force acting on non-magnetic body immersed in ferrofluid were carried out. The study was performed nonmagnetic sphere cylindrical container filled with the fluid magnetized by uniform field. symmetry experimental setup allowed simplification problem: 2D axisymmetric simulation corresponded to 1D measurements. turned out be non-monotonic: it has two extrema one or three zero values depending geometrical parameters magnitude applied field intensity. It shown that wall effects are crucial for this problem, because vicinity container’s bottom (or top) may change its sign (direction). This behaviour can described only framework inductive approach, which takes into account all demagnetizing fields generated container. On contrary, simplified non-inductive approach is unable explain behaviour, especially effects.