Magnetic ejection effect under uniform magnetic field

W. Gault¹ - Y. Iwamoto² - X.-D. Niu² - F. Magoules¹ - H. Yamaguchi²

¹ Ecole Centrale Paris, Crande Voie des Vignes 92295 Chatenay-Malabry, France
² Department of Mechanical Engineering, Doshisha University Tataramiyakodani 1-3, Kyotanabe city, Kyoto, 610-0321, Japan

Abstract
In the present work, a study of the ejection of a non-magnetic particle due to the magnetic buoyancy force under a uniform magnetic field was carried out. The simulation is based on a hybrid Lattice Boltzmann Method (LBM). The non-magnetic particle’s trajectory was calculated using resultant numerical flow field solutions. Generally, no magnetic body force acts on the fluid under a uniform magnetic field if the magnetization of the magnetic fluid has no temperature dependence. However, when Temperature-Sensitive Magnetic Fluid (TSMF) is combined with a gradient of temperature, the phenomenon of magnetic ejection happens for a particle. In the present work, it is revealed that the particle is ejected from its initial position and moves towards the low pressure regions regardless of the liquid flow direction.. Tables 1, Figs 2, Refs 5.