Free Surface Of Magnetic Fluid Research Articles

Topological instability of a semi-bounded magnetic fluid drop under influence of magnetic and ultrasound fields

Theoretical and experimental results on deformation and disintegration on parts (topological instability) of semi-bounded magnetic fluid drop placed on horizontal plate in the presence of gravity and vertical external uniform magnetic field, and the influence of acoustic wave on these processes, as well as an experimental results of acoustic fountain on free surface of magnetic fluid are presented. The role of individual mechanisms leading to disintegration is analyzed, and analytical relationships and experimental dependences for critical parameters are established.

Free surface of magnetic fluid with a spherical ferromagnetic body in a uniform magnetic field

Free surface of magnetic fluid with a spherical ferromagnetic body in a uniform magnetic field

Magnetofluidic effects usable for sensors achievement

The paper presents a few physical properties of magnetic fluids usable for sensors construction and some magnetofluidic sensors based on these properties. The effects of the gradient force of magnetic field on the free surface of magnetic fluid and on the principle of magnetofluidic spectrometry are analysed. The mobility of magnetic fluids usable as magnetic core is analysed in order to illustrate the possibility to use this effect for construction of new types of sensors.

Numerical Analysis on the Deformation of Free Surface of Magnetic Fluid. 1st Report. In the Case of Steady Non-uniform Magnetic Field.

Numerical analysis is conducted on the deformation of the free surface of a magnetic fluid. Applied magnetic fields are steadily induced by a circular current loop located under the magnetic fluid. Governing equations of magnetic fields are solved using the concept of vector potential. Fluid flow is calculated by using the finite volume method with marker particles. The surface of the magnetic fluid is formed the balance of surface force, gravity, pressure difference, magnetic normal pressure and magnetic body force. The results of simulation show the instability of the free surface of the magnetic fluid due to the effect of the magnetic terms. The rise and fall pattern of the free surface of the magnetic fluid are qualitatively clarified, and the patterns of a steady nonuniform magnetic field induced by a circular current loop are quantitatively presented.

Propagation of surface waves of magnetic fluids in travelling magnetic fields

Propagation of waves on the free surface of magnetic fluid is experimentally investigated. It is found that the surface velocity of the magnetic fluid depends on the intensity and frequency of traveling magnetic fields, and depth of the channel contained with the magnetic fluid. Theoretical investigation is also carried out in order to clarify the phenomena.

Numerical study of equilibrium forms of magnetic fluid including magnetic field disturbances

A numerical algorithm is developed for determining equilibrium forms of a free surface of magnetic fluid taking account of magnetic field perturbation. The algorithm is approved by the problem on the shape of an isothermal magnetic fluid droplet in a uniform magnetic field. Numerical results agree with experimental data.