Effect of Particles Diameter on the Properties of Ni Group ER Fluid

2011 ◽  
Vol 335-336 ◽  
pp. 18-22
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Shear Stress ◽  
Electric Field ◽  
Particle Diameter ◽  
Critical Value ◽  
Core Shell ◽  
Microstructure Observation ◽  
A Value ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid

By means of structure analysis, mechanical properties test and microstructure observation，structure of Ni and Ni/TiO2group particles have been obtained, the relationship among particSubscript textSubscript textle diameter，electric field strength and shear ratio of the properties of Ni/TiO2group core-shell particles ER fluid have been researched. It has been found that with increasing particle diameter，the shear stress of ER fluid decreased, and with increasing shear ratio，the shear stress of ER fluid increased for same diameter particle and composition ER fluid. At same time, the smaller of particle diameter, the higher of ER properties such as shear stress, but there is a critical value for shear ratio, when shear ratio is larger than critical value, the properties of ER is nearly a value for same composition ER fluid. Particles chain of ER fluid under certain electric field is different with diversity Ni group Particles.

Electrorheological Properties of Ni-Group Nano Particles and Multilayer Compound Polar Molecule Modify

2012 ◽  
Vol 476-478 ◽  
pp. 1749-1752
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Song Ji ◽  
Hong Zhao ◽  
Min Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Polar Molecule ◽  
Nano Particles ◽  
Core Shell ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid ◽  
Electrorheological Properties ◽  
Molecule Type

This paper emphasis has researched the ER properties of Ni group core-shell nano particles modifier with Urea，SDBS and other polar molecule，analysis the relationship among ER properties and polar molecule type ，compound modifier under different electric field or magnetic field. It is found that the shear stress increasing with adding polar molecule, compound polar molecule modify can marked advance the properties of Ni group core-shell particles ER fluid.

Effect of Particles Size on the Properties of Nano Core-Shell Ni/TiO2 EMR Fluid

2011 ◽  
Vol 211-212 ◽  
pp. 775-779 ◽  
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Qiao Li ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Electromagnetic Field ◽  
Electrorheological Fluid ◽  
Critical Value ◽  
Core Shell ◽  
Fluid Properties ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid

By means of mechanical properties test， the relationship among particle size，electric field，magnetic field ,electromagnetic field and shear ratio on the Ni/TiO2/Urea core-shell particles electrorheological fluid properties analyses. It is found that with increasing particle size， the property of electrorheological fluid decreased, and with increasing shear ratio the property of electrorheological fluid increased for same composition ER. At same time, the smaller of particle size, the higher of ER properties, but there is a critical value for shear ratio, the properties of ER is near value for same composition ER fluid. In magnetic field, the properties of ER showed a contrary result, the smaller of particle size, the lower of ER properties，and electromagnetic field make the properties increase.

Research on the Properties of Nano Core-Shell Ni/TiO2/Urea EMR Fluid

2011 ◽  
Vol 687 ◽  
pp. 519-522
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Qiao Li ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Electrorheological Fluid ◽  
Critical Value ◽  
Core Shell ◽  
Reciprocal Effect ◽  
Fluid Properties ◽  
Shell Particles ◽  
Er Fluid

In the present paper, mechanical properties test and morphology observation，the effect among electric field, magnetic field and electromagnetic field, shear ratio on the Ni/TiO2/Urea core-shell particles electrorheological fluid properties were studied. It is found that with increasing electric field, magnetic field and shear ratio in the same composition electrorheological fluid, the property of electrorheological fluid can be increased. However, there is a critical value for shear ratio. When shear ratio is larger than 20s-1, the property of ER is nearly certain value for same composition ER fluid. Electromagnetic field reciprocal effect can increase the properties of ER fluid, and make the particles chain become thicker and interweaved each other.

Properties and Structure of Ni/TiO2/Polar Molecule Core-Shell Particles Electrorheological Fluid

2012 ◽  
Vol 512-515 ◽  
pp. 2166-2170
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Hong Zhao ◽  
Song Ji ◽  
Li Qiao ◽  
...  
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Electrorheological Fluid ◽  
Polar Molecule ◽  
Fluid Properties ◽  
Structure Observation ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid

By means of mechanical properties test and structure observation， the relationship among electric field strength, polar molecule type, content on the Ni/TiO2group electrorheological fluid properties have been analyzed. It is found that with increasing electric field strength，the properties of electrorheological fluid increased for same composition ER fluid. Different type polar molecules have distinct effect. For same particle，with increasing polar molecule content，the property is increased, but there is a critical value . Polar molecule make particles chain of electrorheological fluid become strong，coarse and interweaved each other.

Rheology Properties of Ni/TiO2/SDBS EMR Fluids

2013 ◽  
Vol 706-708 ◽  
pp. 254-257 ◽  
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Hong Zhao ◽  
Song Ji ◽  
Min Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Shear Stress ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Critical Value ◽  
Fluid Properties ◽  
The Relationship

By means of mechanical properties test，the relationship among shear ratio, concentration and electric field, magnetic field, electromagnetic field on the Ni/TiO2/SDBS EMR fluid properties have been analyzed. It had found that with increasing shear ratio，the shear stress of Ni/TiO2/SDBS EMR fluid increased for same composition, but there is a critical value. With increasing concentration，the property of EMR fluid increased for same shear ratio. Coupling electromagnetic field makes the properties improve.

Effect of Particles Concentration on the Properties and Microstructure of Ni/TiO2 Group EMR

2012 ◽  
Vol 510 ◽  
pp. 594-598
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Electric Field ◽  
Electrorheological Fluid ◽  
Core Shell ◽  
Critical Range ◽  
Microstructure Observation ◽  
The Relationship

By means of mechanical properties test and microstructure observation,the relationship between mechanical properties ,microstructure graph of core-shell Ni/TiO2group particles concentration of EMR and different electric field, magnetic field or electric-magnetic field have been researched. It is found that with increasing of particles concentration, the properties are increased. But there is a critical range value, too high or too low particles concentrations are harmful to properties and microstructure. The best particles concentration of Ni/TiO2particles is about 30%. In the same field with increasing concentration, particles chain of electrorheological fluid under certain electric field become more strong,brawnier and interweaved each other.

Research on the Properties of Rheology of Ni/TiO2 Group ER Fluid

2011 ◽  
Vol 214 ◽  
pp. 312-315
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Electrorheological Fluid ◽  
Critical Value ◽  
Fluid Properties ◽  
The Relationship ◽  
Er Fluid

By means of mechanical properties test，the relationship among shear ratio, concentration and electric field, magnetic field ,electromagnetic field on the Ni/TiO2 group electrorheological fluid properties have been analyzed. It is found that with increasing shear ratio，the property of electrorheological fluid increased for same composition ER, but there is a critical value. With increasing concentration，the property of electrorheological fluid increased for same shear ratio. Coupling electromagnetic field makes the properties improve.

scholarly journals Internal Damper Characteristics of Rotor System with Submerged ER Fluid Journal Bearing

1997 ◽  
Vol 3 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Siyoul Jang ◽  
John A. Tichy
Keyword(s):  
Shear Stress ◽  
Electric Field ◽  
Shear Strain ◽  
Yield Stress ◽  
Electric Fields ◽  
Journal Bearing ◽  
Shear Strain Rate ◽  
Newtonian Flow ◽  
Damping Coefficients ◽  
Er Fluid

Electro-Rheological (ER) fluid behavior is similar to Bingham fluid’ s. Only when the shear stress magnitude of ER fluid exceeds the yield stress, Newtonian flow results. Continuous shear strain rate equation about shear stress which simulates Bingham-like fluid shows viscosity variations. Shear yield stress is controlled by electric fields. Electric fields in circumferential direction around the journal are also changeable because of gap distance. These values make changes of spring and damping coefficients of journal bearings compared to Newtonian flow case. Implicit viscosity variation effects according to shear strain rates of fluid are included in generalized Reynolds' equation for submerged journal bearing. Fluid film pressure and perturbation pressures are solved using switch function of Elord's algorithm for cavitation boundary condition. Spring and damping coefficients are obtained for several parameters that determine the characteristics of ER fluids under a certain electric field. From these values stability region for simple rotor-bearing system is computed. It is found that there are no big differences in load capacities with the selected electric field parameters at low eccentric region and higher electric field can support more load with stability at low eccentric region.

Effect of Urea Content on Properties and Microstructure of Ni/TiO2 Group Particles ER Fluid

2012 ◽  
Vol 496 ◽  
pp. 25-29 ◽  
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Hong Zhao ◽  
Song Ji ◽  
Hong Yan Guo ◽  
...  
Keyword(s):  
Electric Field ◽  
Mass Ratio ◽  
Microstructure Observation ◽  
Urea Content ◽  
Column Structure ◽  
Dc Electric Field ◽  
Er Fluids ◽  
Er Fluid

This paper emphasis have researched the effect of Ni/TiO2group particles modifier with Urea by properties and microstructure，it has showed that ER activity of the particles were closely associated with urea content. When the mass ratio of urea/Ti is 30%, The microstructure observation of the ER fluids under DC electric field showed that the particles aggregated to form thicker and dense column structure when the mass ratio of Urea/Ti is 30%, while the column structure were broken when excessive urea (>30%) was added. A thin and loose column structure was formed in non-urea added ER fluid.

ELECTRORHEOLOGY OF DISPERSIONS OF BaxSr(1-x)TiO3 IN SILICONE OIL UNDER AC OR DC ELECTRIC FIELD

2012 ◽  
Vol 26 (14) ◽  
pp. 1250081 ◽  
Author(s):  
GLAUBER M. S. LUZ ◽  
ANTONIO J. F. BOMBARD ◽  
SILVIO L. M. BRITO ◽  
DOUGLAS GOUVÊA ◽  
SHEILA L. VIEIRA
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Electric Field ◽  
Silicone Oil ◽  
Ferroelectric Materials ◽  
Dc Electric Field ◽  
Ac Fields ◽  
Er Fluid ◽  
Constant Shear Rate

Electrorheology (ER) of ferroelectric materials such as nanometric BaTiO 3 is still not fully understood. In this paper, nanoparticles of Ba x Sr (1-x) TiO 3 (where x = 0.8, 0.9 or 1.0) were synthesized using the method of Pechini, calcinated at 950°C, and after, lixiviated under pH 1 or pH 5. A controlled stress rheometer (MCR-301) was used to make the ER characterization of dispersions made of Ba x Ti 1-x O 3 in silicone oil (30% w/w), where (a) shear stress as a function of DC electric field (under constant shear rate) or (b) shear stress as a function of shear rate (under constant AC or DC electric field) were measured. We observed that electrophoresis occurred under electric field DC, creating a concentration gradient which induced phase separation in ER fluid. On the other hand, under AC fields above 1 kV/mm, the ER effect is stronger than for DC field, and almost without electrophoresis. Furthermore, there is an AC frequency, dependent on the disperse phase, where the ER effect has a maximum.

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