The influence of magnetic field on free surface ferrofluid flow

M. Habera^{1, 2} - M. Fabian^{1, 3} - M. Šviková¹ - M. Timko⁴

¹ High School of St. Thomas Aquinas, Zbrojniċná 3, 04001 Košice, Slovakia
² Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 12116 Praha, Czech Rebuplic
³ Faculty of Mechanical Engineering, Technical University of Košice, Letná 9, 04200 Košice, Slovakia
⁴ Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

Abstract
This paper experimentally investigates the influence of magnetic field on the breakup of ferrofluid flow. In a dripping regime, with the increasing parallel magnetic field strength, the drop elongation coefficient increases, while the drop volume decreases. A simple quasi-static model is suggested for interpretation of the droplet volume decrease. The shape is discussed using a theory based on minimizing the sum of surface and magnetic energy of the ellipsoidal drop. At a little bit larger velocity at the nozzle, applying a magnetic field induces dripping to jetting transition, while in a jetting regime significantly smaller drops arise. Figs 7, Refs 7.