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This paper analyses mathematical models and numerical simulation results for a notional miniature, planar, spiral transformer (MPST) fabricated in MEMS technology, for galvanic separation, proposed to equip an electric harvesting device (EHD). Two types of core -ferrite and (partially) magnetic nanofluid -are considered. We found that magnetization body forces occur in the super-paramagnetic nanofluid core and they result in complex, steady state flows consisting of fully 3D recirculation cells.