Ferrofluid Dynamics of a Single-Peak under an Oscillating Magnetic Field
نویسندگان
چکیده
A magnetic field applied normal to the surface of a ferrofluid is temporally varied so as to exhibit nonlinear behavior. The overall effect will result in hydrodynamic and magnetic nonlinearities, in which the magnetic coupling between the fluid and the external field results in a hysteresis effect that serves as the primary nonlinearity of interest. A period doubling route is observed with variance of amplitude, frequency, and voltage offset.
منابع مشابه
Nonlinear Dynamics of a Single Ferrofluid-Peak in an Oscillating Magnetic Field
If a magnetic field normal to the surface of a magnetic fluid is increased beyond a critical value a spontaneous deformation of the surface arises (normal field instability). The instability is subcritical and leads to peaks of a characteristic shape. We investigate the neighborhood of this instability experimentally under the influence of a temporal modulation of the magnetic field. We use a s...
متن کاملTHERMAL RATCHET EFFECT IN FERROFLUIDS A.Engel
Introduction. The extraction of directed motion from random fluctuations is an old and controversial problem in statistical mechanics with a long and interesting history [1]. Although excluded by the second law of thermodynamics for equilibrium systems, rectification of fluctuations is possible in systems driven sufficiently far away from thermal equilibrium [2, 3]. The problem has gained renew...
متن کاملTorque measurements on ferrofluid cylinders in rotating magnetic fields
We study the response of magnetic nanoparticle suspensions (ferrofluids) to uniform rotating magnetic fields generated by a two-pole three-phase magnetic induction motor stator winding. Measurements of the torque required to rotate a polycarbonate spindle submerged in ferrofluid subjected to co-rotating and counter-rotating fields yield experimental observations of negative magnetoviscosity in ...
متن کاملDynamics of ferrofluid drop deformations under spatially uniform magnetic fields
We systematically study the shape and dynamics of a Newtonian ferrofluid drop immersed in an immiscible, Newtonian and non-magnetic viscous fluid under the action of a uniform external magnetic field. We obtain the exact equilibrium drop shapes for arbitrary ferrofluids, characterize the extent of deviations of the exact shape from the commonly assumed ellipsoidal shape, and analyse the smoothn...
متن کاملبررسی عددی انتقال حرارت جابه جایی اجباری فروسیال در لوله تحت میدان مغناطیسی
This research study presents a numerical study on forced convection heat transfer of an aqueous ferrofluid passing through a circular copper tube in the presence of an alternating magnetic field. The flow passes through the tube under a uniform heat flux and laminar flow conditions. The primary objective was to intensify the particle migration and disturbance of the boundary layer by utilizing ...
متن کامل