Effect of cluster formation on dynamic response of an electrorheological fluid in shear flow

Choi, Byounghoan; Nam, Yoon Kwon; Yamane, Ryuichiro; Park, M K

doi:10.1088/1742-6596/149/1/012004

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…The step response time of ER fluids is dependent on fluid chemistry and in many cases on the temperature and the applied shear rate (Schneider and Eibl, 2008;Ulrich et al, 2009). In some cases, the step response time is also dependent on the applied shear mode or the way the experiment is carried out (Choi et al, 2009). A lot of work has been done to characterize the dynamics of the structure formation in ER fluids and correlate it to various models.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Step Response Time and Bandwidth of Electrorheological Fluids

Gurka

Petričević²,

Schneider

et al. 2011

Journal of Intelligent Material Systems and Structures

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The dynamic behavior of the commercially used electrorheological fluid RheOil3.0 is measured under well-defined conditions. Measurements were carried out in shear mode as well as in flow mode using flow channels that provide similar flow conditions to many electrorheological applications. The response times of the change in flow behavior upon a changed electric field are measured. Measurements were carried out in time domain (single step response) as well as in frequency domain (sinusoidal frequency sweep). In most flow conditions, the observed dynamic behavior is characterized by two leading response times of which the fast one is in the millisecond range. Under stable flow or constant shear rate conditions, ionic conductivity is found to be a limiting factor for a quick step response.

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Section: Introductionmentioning

confidence: 99%

Characterization of Step Response Time and Bandwidth of Electrorheological Fluids

Gurka

Petričević²,

Schneider

et al. 2011

Journal of Intelligent Material Systems and Structures

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“…Because the response time is influenced by the properties of the flow, it is measured mostly in the case where the fluid is under mechanical deformation. These measurements are based on the determination of timedependent stress [3][4][5] or pressure change [6,7] of the fluid. The stress-response-based measurements are done mainly in shear mode with different geometries, while there are only a few compressive stress studies regarding the response time [8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic dielectric response of electrorheological fluids in drag flow

Horváth

Szalai

2015

Phys. Rev. E

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We have determined the response time of dilute electrorheological fluids (ER) in drag flow from the dynamic dielectric response. On the basis of a kinetic rate equation a new formula was derived to approximate the experimental time-dependent dielectric permittivity during the temporal evolution of the microstructure. The dielectric response time was compared to the standard rheological response time extracted from the time-dependent shear stress, and a good agreement was obtained. We found that the dielectric method is more sensitive to detect any transient during the chain formation process. The experimental saturation value of the dielectric permittivity corresponding to the equilibrium microstructure was estimated on the basis of formulas derived from the ClausiusMossotti equation.

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“…There is much interpretation of ER effect, the fundament is that the particles will be formed chain network along the direction of electric field under the external electric field. This is proved by a large number of scientific experiments [1][2][3][4]. However, these theory and experimental results are based on static or quasi-static rotational rheometer.…”

Section: Introductionmentioning

confidence: 99%

Simulation Studies on Structure-Force Dynamic Coupling of Electrorheological Fluids in a Poiseuille Flow Field

Zhu

Tang

et al. 2012

AMR

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Based on the modified Maxwell-Wagner model, the molecular dynamics method is applied to simulate the three-dimensional structural changes of the electrorheological (ER) fluids in an electric field and a poiseuille flow field. And it is analyzed that the structure-force dynamic coupling is characterized significantly by capture effect. The simulation results show that: when the electric field is applied, a chain network will capture the upstream particles in the flow field causing the local electric field force changed. Eventually a body-centered tetrahedron (BCT) is formed, and the structure-force dynamic coupling characterizes significantly. For an ER fluids in a electric field, there exist a threshold of pressure gradient. Its significance of structure-force dynamic coupling is related to electric field intensity, pressure gradient or flow velocity.

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Effect of cluster formation on dynamic response of an electrorheological fluid in shear flow

Cited by 5 publications

References 8 publications

Characterization of Step Response Time and Bandwidth of Electrorheological Fluids

Characterization of Step Response Time and Bandwidth of Electrorheological Fluids

Dynamic dielectric response of electrorheological fluids in drag flow

Simulation Studies on Structure-Force Dynamic Coupling of Electrorheological Fluids in a Poiseuille Flow Field

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