A model of low-frequency rotating magnetic field with a weak axial gradient

2005 ◽  
Vol 41 (2) ◽  
pp. 189-198 ◽  
2011 ◽  
Vol 222 ◽  
pp. 221-224 ◽  
Author(s):  
Ivars Javaitis ◽  
Vineta Zilgalve

A model of elastic magnetic filaments is developed, which allows investigating the dependence of filament dynamics on such physical parameters as magnetoelastic number (Cm), frequency of magnetic field, coefficient of friction, etc. By numerical simulation of the dynamics of filament shaping under the action of magnetic field it is shown that a characteristic U-like stable shape (hairpins) can form. Such a shape of filament can exist in the case of low-frequency rotating magnetic field. At the frequency increasing the U-like shape transforms to the S-like one. In the present work it is shown that in unsteady magnetic field a flexible magnetic filament “swims” in the direction of magnetic field.


Theranostics ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 1735-1748 ◽  
Author(s):  
Yajing Shen ◽  
Congyu Wu ◽  
Taro Q. P. Uyeda ◽  
Gustavo R. Plaza ◽  
Bin Liu ◽  
...  

Soft Matter ◽  
2017 ◽  
Vol 13 (36) ◽  
pp. 6259-6269 ◽  
Author(s):  
Shahab Boroun ◽  
Faïçal Larachi

Rotational movement of MNPs in ferrogels in an external rotating magnetic field for tuning mass transport.


1997 ◽  
Vol 347 ◽  
pp. 105-118 ◽  
Author(s):  
MARIUS UNGARISH

The paper considers the flow field during spin-up from rest of liquid metal in a cylindrical stationary cavity due to a rotating transverse uniform low-frequency magnetic field. It is assumed that the Ekman and the magnetic Reynolds numbers are small. An approximate model, based on matching of Bödewadt-type layers with an inviscid core, with possible influence from the sidewall, for laminar flow is developed. It is shown that the angular velocity in the core is a function of time only. Analytical solutions for the angular velocity and the meridional flow in the core are presented, and supplemented by finite-difference results to show the sidewall effects. The spin-down following the switch-off of the magnetic forcing, the influence of the axial variations of the magnetic field, and the relevance to turbulent flows are discussed.


2018 ◽  
Vol 37 (4) ◽  
pp. 192-201 ◽  
Author(s):  
Meng Zha ◽  
Qingping Tao ◽  
Jun Li ◽  
Xiaofei Tian ◽  
Shuang Feng ◽  
...  

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