Macroscopic and Microscopic Structural Analyses of Needle-Shaped Condensed Phases in Magnetic Fluids under External Magnetic Fields

2020 ◽  
Author(s):  
Hiroaki Mamiya ◽  
Hironori Sudo ◽  
Jhon L. Cuya Huaman ◽  
Kazumasa Suzuki ◽  
Hiroshi Miyamura ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Magnetic Fluids ◽  
Condensed Phases

scholarly journals Flow control of magnetic fluids exposed to magnetic fields

2009 ◽  
Vol 149 ◽  
pp. 012109 ◽  
Author(s):  
M Reindl ◽  
A Leschhorn ◽  
M Lücke ◽  
S Odenbach
Keyword(s):  
Magnetic Fields ◽  
Flow Control ◽  
Magnetic Fluids

Rheology and Behavior of Magnetic Fluids in Alternating/Rotating Magnetic Fields

2003 ◽  
Author(s):  
Carlos Rinaldi ◽  
Xiaowei He ◽  
Adam Rosenthal ◽  
Thomas Franklin ◽  
Cory Lorenz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Fluids ◽  
Rotating Magnetic Fields ◽  
Magnetic Field Rotation ◽  
Three Phase ◽  
Field Rotation ◽  
And Behavior ◽  
The Magnetic Field ◽  
Cylindrical Test

The rheology and behavior of magnetic fluids in the presence of time-varying magnetic fields is illustrated through three sets of experiments. The first involves measurements of ferrofluid torque on a cylindrical spindle under applied uniform rotating magnetic fields. We measure the torque required to restrain a stationary cylindrical test wall in contact with aqueous ferrofluids subjected to the rotating uniform magnetic field generated by a three-phase AC 2-pole motor stator winding. The torque is found to scale linearly with volume, and to be a function of the applied magnetic field amplitude, frequency and direction of rotation. Measurements show that for ferrofluid entirely inside the cylindrical test wall the torque points in the same direction as the magnetic field rotation pseudovector, whereas for ferrofluid entirely outside the cylindrical wall the torque points in the direction opposite to the field rotation pseudovector. The second set of experiments explores the formation of ordered ferrofluid structures in the gap of a Hele-Shaw cell subjected to simultaneous vertical DC and in-plane horizontal rotating magnetic fields. Finally, the third set of experiments illustrates the effect of applied DC fields on the shape of ferrofluid jets and sheets.

Theoretical Modeling and Simulations of Magnetic Fluids in Gradient Magnetic Fields

2010 ◽  
Vol 146-147 ◽  
pp. 1510-1513
Author(s):  
Xiao Ling Peng ◽  
Xiao Yang ◽  
Hai Biao Wei ◽  
Rui Ping Yue ◽  
Hong Liang Ge
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Gradient ◽  
Magnetic Particles ◽  
Magnetic Field Gradient ◽  
Magnetic Fluids ◽  
Gradient Distribution ◽  
Particle Distributions ◽  
The Right ◽  
Pulsed Fields

When a magnetic field is applied to magnetic fluids (MF), various structures of MF are formed: chain-like structures in low fields, columnar, lamellar and striped structures in high fields, ellipsoidal structures in pulsed fields, and layered structures in rotating fields. The inner structures and particle distributions of MF in gradient magnetic fields are quite interesting, but very few works have been done on this. In the present study, the effects of magnetic field gradient on the structures of MF are investigated using a two-dimensional Monte Carlo simulation. The results show that a gradient distribution of magnetic particles is formed under gradient magnetic fields. Moreover, with increasing the field gradient, more magnetic particles are pushed to the right region and particle distribution changes from grass-like clusters to needle-like ones.

Influence of the Magnetic Interaction among Particles on Distributions of Magnetic Fluids Using Computer Simulations

2010 ◽  
Vol 150-151 ◽  
pp. 1595-1598
Author(s):  
Xiao Ling Peng ◽  
Hai Biao Wei ◽  
Xiao Yang ◽  
Rui Ping Yue ◽  
Hong Liang Ge
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Particles ◽  
Particle Distribution ◽  
Magnetic Field Gradient ◽  
Magnetic Interaction ◽  
Magnetic Fluids ◽  
Colloidal Dispersion ◽  
Gradient Distribution ◽  
Particle Distributions

Magnetic fluid is a stable colloidal dispersion of ferromagnetic particles in a liquid carrier. Once a magnetic field is applied to magnetic fluids (MF), various structures of MF are formed. A detailed understanding of structures and particle distributions in gradient magnetic fields is much important. But very few works have been done on this. In the present study, the effects of magnetic field gradient and magnetic interaction among magnetic particles on the structures of MF are investigated using a two-dimensional Monte Carlo simulation. The results show that a gradient distribution of magnetic particles is formed under gradient magnetic fields. However, as the interaction between magnetic particles increases, the distribution gradient decreases, accompanied by the formation of chain-like clusters. Moreover, with increasing the magnetic interaction, particle distribution changes from grass-like clusters to needle-like ones.

Plasmonic sensor based on tapered optical fibers and magnetic fluids for measuring magnetic fields

2017 ◽  
Vol 264 ◽  
pp. 58-62 ◽  
Author(s):  
E. Rodríguez-Schwendtner ◽  
N. Díaz-Herrera ◽  
M.C. Navarrete ◽  
A. González-Cano ◽  
Ó. Esteban
Keyword(s):  
Magnetic Fields ◽  
Optical Fibers ◽  
Magnetic Fluids ◽  
Plasmonic Sensor
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