Frequency dependence of an alternating magnetic field driven flow

A. Cramer - V. Galindo - M. Zennaro

Helmholtz--Zentrum Dresden--Rossendorf, Institute of Fluid Dynamics, P.O. Box~510119, 01314~Dresden, Germany }{ Università degli Studi di Padova, Department of Industrial Engineering, Via Gradenigo 6/A, 35131 Padua, Italy

Abstract
The flow induced by a single-phase alternating magnetic field (AMF) is studied mainly numerically and by two preliminary experiments of quite different size. For validation, the well known dependence of the characteristic velocity v_c on magnetic induction B is reproduced experimentally and in the simulations. It is shown that the flow structure depends drastically on the frequency f of the AMF. An investigation of the change of v_c with f results in a quantitative difference of flows in an AMF compared to rotating and travelling magnetic fields. Figs 11, Refs 26.