Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields

Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields

Leidong Mao,1,* Shihab Elborai,2 Xiaowei He,2 Markus Zahn,2 and Hur Koser3,† 1Faculty of Engineering, Nanoscale Science and Engineering Center, University of Georgia, 220 Riverbend Road, Room 166, Athens, Georgia 30602, USA 2Department of Electrical Engineering and Computer Science, Laboratory for Electromagnetic and Electronic Systems, Massachusetts Institute of Technology, 77 Massachusetts Av...

Ferrohydrodynamic pumping in spatially traveling sinusoidally time-varying magnetic fields

In this paper, we present a numerical method to simulate the dynamics of ferrofluids in spatially traveling, sinusoidally time-varying magnetic fields. Actuation using traveling waves involves magnetic body forces and torque on the magnetic moment of nanoparticles, both of which affect the overall pumping. r 2004 Elsevier B.V. All rights reserved. PACS: 47.65.+a; 47.11.+j

Ferrohydrodynamic pumping in spatially uniform sinusoidally time-varying magnetic fields

Past work has analyzed ferrofluid pumping in a planar duct driven by spatially non-uniform traveling wave magnetic fields. Here we examine a much simpler case where the applied magnetic fields along and transverse to the duct axis are spatially uniform and varying sinusoidally with time. In the uniform magnetic field the magnetization characteristic depends on particle spin but does not depend ...

Ferrohydrodynamic instabilities in DC magnetic fields

Ferrofluid instabilities in DC magnetic fields for an Isopar-M based ferrofluid with saturation magnetization of about 400 Gauss. a) 1200 Gauss 5 mm diameter magnet behind small ferrofluid droplet surrounded by propanol to prevent ferrofluid wetting of 1 mm gap glass plates; Peak pattern with magnetic field perpendicular to ferrofluid layer. The peaks initiate in a hexagonal array when the magn...

Direct observation of resonant tunneling dynamics in high magnetic fields.