Simulation of Bidisperse Magnetorheological Fluids

Kittipoomwong, David; Klingenberg, Daniel J.; Ulicny, John C.

doi:10.1142/9789812777546_0124

Cited by 4 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effects of an oscillating, and square wave pulsing variations to ER field strength were studied with a 2D simulation by SEE et al [4] . KITTIPOOMWONG et al [5] studied effects of suspension heterogeneity and found an increased yield stress for sheared bidispersed (by size) suspensions over monodispersed in agreement with experimental observation. AHN et al [6] studied the relaxation of polydisperse ER suspensions under linear deformation.…”

Section: Introductionsupporting

confidence: 64%

See 1 more Smart Citation

Simulation of magneto-rheological fluids incorporating hydrodynamic effects

Joung

See

2007

J Cent. South Univ. Technol.

View full text Add to dashboard Cite

The magneto-rheological (MR) response, like the better studied electro-rheological (ER) response, refers to the rapid and reversible viscosity increase seen in certain types of suspensions. The development of a 3D numerical simulation that is able to model the microstructural evolution of MR suspensions including hydrodynamic inter-particle interactions was reported. The current method is essentially a reduced version of the Stokesian Dynamics (SD) method [1] with modifications to model the MR response. MR particles were modeled as rigid magnetizable spheres suspended in a Newtonian fluid. The Rotne-Prager Yamakawa tensor was used in the construction of the resistance matrix. Wall hydrodynamics were included with a formulation for sphere-wall interactions. MR forces were incorporated using superimposed sphere-pair dipole interaction forces. In simulations, particle cluster formations were observed, and the rheological responses due to these formations were examined. Some basic flow scenarios were studied, including periodic infinite shear flow under a constant magnetic field. MR suspensions are prone to suffer from sedimentation when unused. Their response may therefore be sluggish after an extended period of rest. We apply the simulation to the case of the re-suspension of sedimented suspensions (both normal and MR).

show abstract

Section: Introductionsupporting

confidence: 64%

“…(2) (point dipole pairwise superposition is assumed; F(H o )=magnetic force as function of field strength [5] , β=(α−1)/(α+2), α=µ p /µ f magnetic permeability ratio:…”

Section: Mr Forcementioning

confidence: 99%

Simulation of magneto-rheological fluids incorporating hydrodynamic effects

Joung

See

2007

J Cent. South Univ. Technol.

View full text Add to dashboard Cite

show abstract

“…͑16͒ and ͑17͒ represent the rms values͔. For two spheres in a magnetic field, the pointdipole force magnitude assuming linear magnetization is 40,41 …”

Section: A Simulation Methodsmentioning

confidence: 99%

Thermal transport in sheared electro- and magnetorheological fluids

2006

View full text Add to dashboard Cite

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.

show abstract

“…To have a profound understanding and accurate representation of MRFs, it is thus necessary to describe the inherent behaviors of MRFs from the microscopic perspective as well as to propose a pertinent model so that better design and optimization of MR devices can be attained. Having the original knowledge of particle interactions, Doi and Edwards (1988) proposed a microscale shear model to calculate the stress tensor of polymers in dilute solution considering the particle contributions within the suspension system, which was further applied by other researchers (Ekwebelam and See, 2009;Kittipoomwong et al, 2002Kittipoomwong et al, , 2005 to calculate the shear stress of MRFs. This microscale shear model is a volume average of energy attributed to particle interactions.…”

Section: Overview Of Shear Models Of Mrfsmentioning

confidence: 99%

Microstructure evolution based particle chain model for shear yield stress of magnetorheological fluids

Peng

Pei

2020

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

To predict the shear stress of magnetorheological fluids (MRFs) under magnetic field and shear flows, a meso-microscale shear model is proposed based on the entire course of particle aggregates and chains. For this purpose, a systematic study on the microstructure evolution and rheological properties of MRFs is conducted by using molecular dynamics simulations. An efficient chain identification technique is introduced to count the number of particle chains within the suspension system. From the perspective of particle-level simulations, the microstructured behavior of MRFs involving particle aggregation and internal structure evolution of magnetorheological suspensions are addressed. Shear properties of MRFs derived by the proposed model are studied, and model verification by comparison with previous experimental data and predictions of the existing structural viscosity model is included as well. It is revealed that the proposed meso-microscale shear model exhibits satisfactory accuracy and efficiency for describing the rheological properties of MRFs. Besides, the critical factors linked with rheological properties of MRFs such as magnetic field strength, particle volume fraction and shear rate, are analyzed, further demonstrating the applicability of the proposed model in design and optimization of MRFs.

show abstract

Simulation of Bidisperse Magnetorheological Fluids

Cited by 4 publications

References 0 publications

Simulation of magneto-rheological fluids incorporating hydrodynamic effects

Simulation of magneto-rheological fluids incorporating hydrodynamic effects

Thermal transport in sheared electro- and magnetorheological fluids

Microstructure evolution based particle chain model for shear yield stress of magnetorheological fluids

Contact Info

Product

Resources

About