Finite-element analysis of electrostatic interactions in electrorheological fluids

Tao, Ruibao; Jiang, Qi; Sim, H. K.

doi:10.1103/physreve.52.2727

Cited by 57 publications

(43 citation statements)

References 16 publications

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“…5͑a͒, The result, that the interaction in castor oil is stronger than that in silicone oil as the frequency changes from 100 Hz to 3 kHz, must be due to the higher dielectric constant m of the castor oil according to f ϳ m . 8,12,16 Here, the conductivity m of silicone oil and castor oil (ϳ10 Ϫ13 s m Ϫ1 ) are on the same quantitative scale while the dielectric constant of SrTiO 3 is much higher in the system, leading to the mismatch factor ␤ 2 →1 regardless of the variation of frequency. In order for the conductivity and the dielectric constant from high to low, there are methyl salicylate (ϭ6 ϫ10 Ϫ7 s/m), ethyl salicylate (ϭ1ϫ10 Ϫ7 s/m), ethyl benzoate (ϭ5ϫ10 Ϫ8 s/m), and silicone oil (ϳ10 Ϫ13 ) to be used as fluid media.…”

Section: Resultsmentioning

confidence: 99%

Frequency dependence of a field-induced force between two high dielectric spheres in various fluid media

Wang¹,

Shen²,

Niu³

et al. 2003

Journal of Applied Physics

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The frequency dependence of the interaction force f between two identical SrTiO3 spheres has been investigated in various carrying media with different dielectric constants under ac electric field strengths E0. We note that the force f is proportional to E02 and increases with the frequency regardless of the carrying media. The force however, is found to be stronger than that expected theoretically when the interspherical gap is small. The experimental results demonstrate that it is the conductivity that dominates the interaction force at low frequency, while dielectric polarization becomes more important at high frequency, and reveal that stronger interaction force between high dielectric spheres may be obtained in higher dielectric fluids when the frequency of the ac field is high enough. Some anomalous behaviors of f versus frequency are found when the two spheres are nearly touched.

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Section: Resultsmentioning

confidence: 99%

Frequency dependence of a field-induced force between two high dielectric spheres in various fluid media

Wang¹,

Shen²,

Niu³

et al. 2003

Journal of Applied Physics

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“…They found that the contributions to the difference of each higher multipole can be either positive or negative. Subsequent studies were carried out based on the exact evaluation of the electrostatic energy by numerical methods such as the finite element method [31][32][33], the multipole expansion method [34], and the Bergman method [35][36][37]. These calculations gave consistent results and all concluded that the ground state of the DER fluid is a BCT structure.…”

Section: ð3:45þmentioning

confidence: 95%

Dielectric electrorheological fluids: Theory and experiment

Wen

Tam

et al. 2003

Advances in Physics

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Electrorheological (ER) fluids are a class of materials whose rheological properties are controllable by the application of an electric field. A dielectric electrorheological (DER) fluid is the simplest type of ER fluid, in which the material components follow a linear electrostatic response. We review and discuss the progress of the studies on physics of this type of material. A first-principles theory of DER fluids, along with relevant experimental verifications, are presented in some detail. In particular, the properties presented include static equilibrium structure, shear modulus, static yield stress and its variation with applied electric field frequency, and structure-induced dielectric nonlinearity.

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“…The high yield stress and its near-linear dependence on the electric field indicate that the behaviors of our STP ER fluid can be explained by the model of the polar molecule dominated ER (PM-ER) effect [15]. The PM-ER effect is based on the interaction of the polar molecule polarization charge between the particles, where the local electric field is much higher than that of the external field [16][17][18][19], and results in the polar molecules aligning in the direction of the electric field. Figure 3 shows the shear stress of STP ER fluid as a function of shear rate under various electric fields.…”

Section: Resultsmentioning

confidence: 97%

Preparation of Stannum and Titanium Precipitation Particles and its High Electrorheological Properties

Cheng

et al. 2011

Integrated Ferroelectrics

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A type of stannum and titanium precipitation (STP) particle was synthesized by means of co-precipitation method. Suspensions made by dispersing the STP particles in silicone oil exhibit excellent electrorheological (ER) effect with high yield stress, high shear stress at higher shear rate. The static yield stress of the STP ER can be up to 84 kPa at an electric field of 5 kV/mm. The high yield stress and its near-linear dependence on the electric field indicate that the rheological behaviors of our STP ER fluid can be explained by the model of the polar molecule dominated ER (PMER) effect, which arises from the alignment of polar molecules in the gap between neighboring particles.

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Finite-element analysis of electrostatic interactions in electrorheological fluids

Cited by 57 publications

References 16 publications

Frequency dependence of a field-induced force between two high dielectric spheres in various fluid media

Frequency dependence of a field-induced force between two high dielectric spheres in various fluid media

Dielectric electrorheological fluids: Theory and experiment

Preparation of Stannum and Titanium Precipitation Particles and its High Electrorheological Properties

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