Permittivity of electrorheological fluids under steady and oscillatory shear

Adolf, Douglas Brian; Garino, Terry J.; Hance, Bradley G.

doi:10.1021/la00001a053

Cited by 10 publications

(10 citation statements)

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“…17,[25][26][27][28] All studies report that the effective transport properties are enhanced at small shear rates and large field strengths, much like that observed for quiescent suspensions in applied fields. As the shear rate is increased, the effective transport properties decrease, approaching the values obtained for suspensions in the absence of a field.…”

Section: ͑3͒mentioning

confidence: 68%

“…These results agree qualitatively with the experimental results reported for the shear rate and field strength dependence of the dielectric permittivity and electrical conductivity of ER suspensions. 17,[25][26][27][28] At small Mn, hydrodynamic forces are relatively weak, and thus columnar structures that are broken by the straining motion can rapidly reform. On average, the structure is highly anisotropic which results in a large effective thermal conductivity.…”

Section: A Scmf Analysis With Simulated Structuresmentioning

confidence: 99%

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Thermal transport in sheared electro- and magnetorheological fluids

2006

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Thermal energy transport in sheared electrorheological and magnetorheological ͑ER and MR͒ fluids is analyzed. Although energy production by viscous dissipation can be significant, energy transport on the particle length scale can be analyzed by ignoring viscous dissipation. For typical situations, energy transport normal to the flow direction is dominated by conduction. Particle-level simulations were employed to determine the suspension structure as a function of Mason number and volume fraction. A self-consistent mean-field dipole model is used to estimate the effective thermal conductivities for these simulated structures. The field-induced chain-like aggregates that form at small Mason number result in a larger effective thermal conductivity at small Mason number than at large Mason number. Effects of higher-order multipoles are estimated by analyzing effective thermal conductivities of model structures. For highly conducting particles, the effective thermal conductivity of a sheared ER or MR suspension is predicted to roughly double as the Mason number is decreased from the large to the small Mason number limits.

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Section: ͑3͒mentioning

confidence: 68%

Section: A Scmf Analysis With Simulated Structuresmentioning

confidence: 99%

Thermal transport in sheared electro- and magnetorheological fluids

2006

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“…Flow-modified permittivity (FMP) technique is one powerful tool. FMP techniques have been sufficiently developed in the half century past [2,3,7,8], while high-ac-voltage FMP measurements for ER fluids are still challenging. We try to surmount the high-ac-voltage FMP measurement with a highac-voltage bridge [9].…”

Section: Fmp Setupmentioning

confidence: 99%

“…Increasing experimental data about two-phase ER fluids suggest that ER activities have no simple relations with dielectric properties [1][2][3][4][5][6][7]. On the other hand, there exist diverse kinds of materials as active ER substrates [1][2][3][4][5][6][7], which implies that there are common factors for their ER performance.…”

Section: Introductionmentioning

confidence: 99%

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HIGH AC VOLTAGE FLOW-MODIFIED PERMITTIVITY AND RHEOLOGICAL PROPERTIES OF CARBON-DOPED NANO TiO₂ ER FLUIDS

Qiu

Shan

Zhou

et al. 2001

Int. J. Mod. Phys. B

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The associated effects of polarization strength, polarization rate, and dielectric loss on ER performance ware studied hy means of the correlation of rheological properties of carbon-doped Ti0 2 ER fluids with experimental results of flow-modified permittivity (FMP). We prepared ER fluids with carbon-doped Ti02 powders of different conductivity via controlling carbonization temperature and organic contents. The experiments present the optimum organic contents of 4.6% to 9.2% and the optimum carbonization temperature of around 673 K for the better ER activity. The role of conductivity in ER performance is testified. FMP measurements of fluids were performed under weak and strong exciting fields respectively. Under weak exciting field, FMP effects are hardly detectable; while under high exciting field, FMP effects become significant which reflect ER particle configurations, particle orientations, and limited dielectric response time in the combined electric and shear fields. The shear field strength, exciting field strength and frequency are the three main factors influencing the FMP effects. The FMP data can be modeled and qualitatively explained by introducing two characteristic shear rates of D c i and D c2 , J=Jo+Jiexp(-D/D c i)+ J2exp(-D/D c2 ) with D being shear rate.

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Correlation of the Dielectric Properties of Dispersed Particles with the Electrorheological Effect

Hao

1997

Journal of Colloid and Interface Science

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Permittivity of electrorheological fluids under steady and oscillatory shear

Cited by 10 publications

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Thermal transport in sheared electro- and magnetorheological fluids

Thermal transport in sheared electro- and magnetorheological fluids

HIGH AC VOLTAGE FLOW-MODIFIED PERMITTIVITY AND RHEOLOGICAL PROPERTIES OF CARBON-DOPED NANO TiO₂ ER FLUIDS

Correlation of the Dielectric Properties of Dispersed Particles with the Electrorheological Effect

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Permittivity of electrorheological fluids under steady and oscillatory shear

Cited by 10 publications

References 0 publications

Thermal transport in sheared electro- and magnetorheological fluids

Thermal transport in sheared electro- and magnetorheological fluids

HIGH AC VOLTAGE FLOW-MODIFIED PERMITTIVITY AND RHEOLOGICAL PROPERTIES OF CARBON-DOPED NANO TiO2 ER FLUIDS

Correlation of the Dielectric Properties of Dispersed Particles with the Electrorheological Effect

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HIGH AC VOLTAGE FLOW-MODIFIED PERMITTIVITY AND RHEOLOGICAL PROPERTIES OF CARBON-DOPED NANO TiO₂ ER FLUIDS