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  • 1
    Electronic Resource
    Electronic Resource
    Kinetics of structure formation in electrorheological suspensions (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4644-4648 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Kinetics of structure formation in electrorheological (ER) suspensions are characterized by the time required to form percolating fibers following application of an external electric field. Experimental results are compared with predictions from simulations using an electrostatic polarization model for ER suspensions. Results from the two approaches agree, with large response times at small concentrations, decreasing to 10 ms at large concentrations and field strengths of 2 kV/mm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352759
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  • 2
    Electronic Resource
    Electronic Resource
    The small shear rate response of electrorheological suspensions. II. Extension beyond the point–dipole limit (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6170-6178 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electrorheological (ER) suspensions display dramatic changes in their rheological properties when subjected to large electric fields. In an accompanying paper, a molecular dynamics-like simulation technique was developed to investigate sheared ER suspensions. The results of that study predicted a dynamic yield stress that saturates at large concentrations of the disperse phase. Experimental results are presented here which confirm the predicted saturation of the yield stress. The experimentally determined yield stresses are larger than the values predicted by the simulations in the point–dipole limit. This discrepancy is accounted for by reconciling approximations made in the simulation model. Incorporation of multipole and multibody contributions to the electrostatic interaction between spheres through a perturbation analysis suggests that accurate predictions of yield stresses can be made. However, we find that the ER response is sensitive not only to the material dielectric properties, but also the details of the pair interactions between particles at vanishing separations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460403
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic simulation of electrorheological suspensions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 7888-7895 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A simulation method is developed to investigate structure formation in electrorheological suspensions. The suspension is treated as polarizable, spherical particles in a nonconducting medium, with the spheres subject to electric polarization forces due to an applied electric field and to hydrodynamic resistance due to their motion through the continuous phase. The fibrous structures obtained from these simulations are independent of electric field strength and continuous phase viscosity in agreement with experimental observation. We have also found that the details of the simulated structures are sensitive to the treatment of the short-range forces preventing particle overlap. When this force is represented by a form that accurately approximates a hard-sphere interaction, the simulated structures agree well with those obtained experimentally, both with respect to their appearance and the time scale for structure formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457256
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  • 4
    Electronic Resource
    Electronic Resource
    The small shear rate response of electrorheological suspensions. I. Simulation in the point–dipole limit (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6160-6169 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electrorheological (ER) response is defined as the rapid and reversible change in the rheological properties of nonaqueous suspensions due to the application of large electric fields [∼O(1 kV/mm)]. Orders of magnitude increases in suspension viscosities at small shear rates are commonly observed, and are believed to be due to the field-induced formation of fibrous structures. A molecular dynamics-like simulation technique is developed to investigate the ER response at small shear rates. The suspensions are modeled as monodisperse suspensions of hard, dielectric spheres contained in a Newtonian fluid between parallel plate electrodes, and subjected to electrostatic and hydrodynamic forces. The results predict a dynamic yield stress with a concentration dependence that agrees well with experimental results. The magnitudes of the simulated stresses are smaller than the experimental values, a result of approximations in the model. This issue is addressed in the second paper of this series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460402
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the steady-shear behavior of electrorheological suspensions (1990)
    s.l. : American Chemical Society
    Langmuir 6 (1990), S. 15-24 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00091a003
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  • 6
    Electronic Resource
    Electronic Resource
    A microstructural investigation of the nonlinear response of electrorheological suspensions (1995)
    Springer
    Rheologica acta 34 (1995), S. 417-429 
    Details
    ISSN: 1435-1528
    Keywords: Electrorheology ; nonlinear ; simulations ; stability ; steady shear
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Particle-level simulations are employed to investigate the transition from linear to nonlinear rheological behavior for electrorheological suspensions under start-up of steady shear flow. This transition is found to first arise from the very slight rearrangement of structures, as opposed to the gross rupture of particulate columns. Linear stability analysis shows that these rearrangements occur when the structures are sheared into electrostatically unstable configurations. The rearrangements also produce a second type of relaxation phenomenon that appears at low frequencies and finite strain amplitudes. Incorporating more realistic force descriptions into the idealized simulation model shifts the transition to nonlinear deformation to smaller strain amplitudes, approaching experimentally observed values. The role of the rearrangement of unstable structures on the oscillatory shear flow response is investigated in the following paper, Part II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396555
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