1301 Damping property of magnetic compound fluids containing needle-like magnetic particles or needle-like nonmagnetic particles

2014 ◽  
Vol 2014 (0) ◽  
pp. _1301-1_-_1301-2_
Author(s):  
Yasushi IDO ◽  
Shunsuke TOBITA ◽  
Yuuki YOKOYAMA ◽  
Koichi HAYASHI
Keyword(s):  
Magnetic Particles ◽  
Damping Property ◽  
Nonmagnetic Particles

Simulation of Behavior of Micrometer-Size Particles in the Polishing Process of a Micro-Tube Filled with a Magnetic Fluid under Uniform Magnetic Field

2012 ◽  
Vol 721 ◽  
pp. 205-210 ◽  
Author(s):  
Yasushi Ido ◽  
Kazuya Arakawa ◽  
Keisuke Asakura ◽  
Hitoshi Nishida
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Uniform Magnetic Field ◽  
Magnetic Particles ◽  
Particle Method ◽  
Polishing Process ◽  
Stokesian Dynamics ◽  
Micrometer Size ◽  
Nonmagnetic Particles ◽  
Discrete Particle Method

Behavior of suspended magnetic and nonmagnetic micrometer-size particles in a micro-tube filled with a magnetic fluid is investigated by using the discrete particle method based on the simplified Stokesian dynamics in order to know the polishing process of inner wall of a tube. It is shown that the chain-like clusters of magnetic particles are surrounded by clusters of nonmagnetic particles in the presence of uniform magnetic field. The clusters are held in the field direction in case of rotation of the micro-tube and in case of rotation of magnetic field.

0801 Damping property of magnetic compound fluids containing needle-like magnetic particles

2013 ◽  
Vol 2013 (0) ◽  
pp. _0801-01_-_0801-02_
Author(s):  
Yasushi IDO ◽  
Koichi HAYASHI ◽  
Shunsuke TOBITA
Keyword(s):  
Magnetic Particles ◽  
Damping Property

Behavior of both Nonmagnetic Particles and Magnetic Particles in Magnetic Compound Fluids in a Micro-Tube with Axial Flow under Rotating Magnetic Field

2016 ◽  
Vol 856 ◽  
pp. 9-14
Author(s):  
Yasushi Ido ◽  
Keisuke Asakura ◽  
Hitoshi Nishida
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
Axial Flow ◽  
Particle Method ◽  
Rotating Magnetic Field ◽  
Abrasive Particles ◽  
Discrete Particle ◽  
Micrometer Size ◽  
Nonmagnetic Particles ◽  
Discrete Particle Method

Behaviors of both micrometer-size nonmagnetic abrasive particles and micrometer-size magnetic particles in a magnetic fluid are investigated by using the discrete particle method which is based on the simplified Stokes dynamics. Sheet-like clusters of nonmagnetic particles and sheet-like clusters of magnetic particles alternately appear one after another in the axis direction when the flow velocity is small.

Numerical Analysis of the Polishing Process of Inner Tube Wall Using Micron-Size Particles in Magnetic Fluids

2010 ◽  
Vol 670 ◽  
pp. 110-117 ◽  
Author(s):  
Yasushi Ido ◽  
Takaya Yamaguchi ◽  
Hitoshi Nishida
Keyword(s):  
Magnetic Particles ◽  
Tube Wall ◽  
Particle Method ◽  
Magnetic Fluids ◽  
Polishing Process ◽  
Abrasive Particles ◽  
Micron Size ◽  
Small Tube ◽  
Nonmagnetic Particles ◽  
Magnetic Poles

Distribution and behaviour of micron-size magnetic particles and nonmagnetic particles in magnetic fluids in the polishing process of inner wall of small tube is investigated numerically by using the particle method based on the simplified Stokes dynamics. In this study, it is shown that chain-like clusters of both magnetic particles and those of nonmagnetic abrasive particles are formed between the two magnetic poles. The clusters are strongly held during the polishing process. The clusters of the nonmagnetic abrasive particles are surrounding the clusters of magnetic particles and they are combined with each other.

scholarly journals Optimization of Airflow Field for Pneumatic Drum Magnetic Separator to Improve the Separation Efficiency

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1228
Author(s):  
Xudong Li ◽  
Yuhua Wang ◽  
Dongfang Lu ◽  
Xiayu Zheng ◽  
Xuesong Gao
Keyword(s):  
Flow Field ◽  
Magnetic Particles ◽  
Separation Efficiency ◽  
Separation Zone ◽  
Effective Means ◽  
Magnetic Separator ◽  
Fine Grained ◽  
Airflow Field ◽  
Nonmagnetic Particles ◽  
Iron Grade

Traditional dry magnetic separation has poor separation efficiency for fine-grained materials, and combining airflow and a magnetic field may be one of the most effective means to improve it. Based on the pneumatic drum magnetic separator developed by our team, an improved pneumatic magnetic separator with a segmented flow field is proposed, which pushes materials to move along the separation surface. Analysis of flow field in the separation zone and the forces on particles show that the improved pneumatic magnetic separator makes it easier to collect fine magnetic particles, while nonmagnetic particles are more easily removed by airflow. Separation test results also show that the iron grade and the recovery of concentrate improved from 37.89% and 74.75% to 51.76% and 91.79%, respectively. The separation efficiency of the pneumatic drum magnetic separator has been remarkably improved by optimizing airflow field in the separation zone.

scholarly journals The Influence of Admixtures to the Signal of an Electromagnetic Flow Meter

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 772 ◽  
Author(s):  
Juozapas Virbalis ◽  
Roma Račkienė ◽  
Miglė Kriuglaitė-Jarašiūnienė ◽  
Konstantinas Otas
Keyword(s):  
Measurement Error ◽  
Electric Conductivity ◽  
Magnetic Particles ◽  
Volume Concentration ◽  
Flow Direction ◽  
Flow Meter ◽  
Electromagnetic Flow ◽  
Particle Measurement ◽  
Electromagnetic Flow Meter ◽  
Nonmagnetic Particles

Measurement error in an electromagnetic flow meter appears if magnetic and electric properties of admixtures are different from that of the fluid. Expressions of the error, which depends on volume concentration, permeability, and electric conductivity of particles were obtained by approximating the particles’ shape as an ellipsoid. Components of the error, which appear inside particles and outside particles in active zone of flow meter, with any canal form are investigated. Expressions of the error are presented assuming that particles are oriented in various directions with respect of the flow direction and are spinning. Different cases of magnetic and electric admixtures properties are discussed. Error expression obtained for flows with nonconductive and nonmagnetic particles coincides with experimental and modelling results obtained by other explorers for flows with air bubbles. Magnetic particles with high electric conductivity are especially dangerous. Extra measurement error in this case greatly depends on the shape of the particle. Measurement error increases if particle shape differs from a sphere. The complementary measurement error can exceed the volume concentration of particles by ten times if the ratio between the longest and the shortest axes of ellipsoid exceeds 3.

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