Temperature Dependence of MR Fluids

Li, W. H.; Chen, G.; Yeo, Song Huat; Du, Hejun

doi:10.1142/s0217979202012906

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…Actually, it was almost six times higher at the highest magnetic field (Figure ). Such a trend was maintained at higher temperatures, although a decrease of the yield stress with temperature was obtained (see Figure S1 of the Supporting Information), in agreement with previous works. − …”

Section: Resultssupporting

confidence: 91%

Optimizing the Magnetic Response of Suspensions by Tailoring the Spatial Distribution of the Particle Magnetic Material

Rodríguez‐Arco

López–López

Kuzhir

et al. 2013

ACS Appl. Mater. Interfaces

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We report an experimental enhancement of the magnetic susceptibility of suspensions of particles that is related to the spatial distribution of the magnetic phase in the particles. At low field, the susceptibility of suspensions of nickel-coated diamagnetic spheres was approximately 75% higher than that of suspensions of solid nickel spheres with the same nickel content. This result was corroborated by magnetostatics theory and simulation. The distribution of the magnetic phase in a shell also led to an improvement of the field-induced rheological response of the suspensions.

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Section: Resultssupporting

confidence: 91%

Optimizing the Magnetic Response of Suspensions by Tailoring the Spatial Distribution of the Particle Magnetic Material

Rodríguez‐Arco

López–López

Kuzhir

et al. 2013

ACS Appl. Mater. Interfaces

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“…For this study, castor oil is used as the base fluid and its viscosity is known to decrease with increase in temperature. Li et al [64] also observed a decrease in yield stress with increase in temperature. They obtained the yield stress values by fitting their data to the Herschel-Bulkley model and since all three parameters in the model, namely yield stress, consistency index (which indicates the consistency of the fluid), and power law index (which gives the degree of shear thinning) depend on various factors like temperature, magnetic field, material properties etc, they evaluated each quantity at different temperatures for a particular field.…”

Section: Resultsmentioning

confidence: 87%

Magnetorheological properties of sodium sulphonate capped electrolytic iron based MR fluid: a comparison with CI based MR fluid

Vinod

John

Philip

2016

Smart Mater. Struct.

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Magnetorheological fluids have numerous engineering applications due to their interesting field assisted rheological behavior. Most commonly used dispersed phase in MR fluids is carbonyl iron (CI). The relatively high cost of CI warrants the need to develop cheaper alternatives to CI, without compromising rheological properties. With the above goal in mind, we have synthesized sodium sulphonate capped electrolytic iron based MR fluid and studied their magnetorheological properties. The results are compared with that of CI based MR fluid. EI and CI particles of average particle size of ∼10 μm with fumed silica particles additives are used in the present study. The dynamic yield stress for EI and CI based MR fluid were found to vary with field strength with an exponent of roughly 1.2 and 1.24, respectively. The slightly lower static and dynamic yield stress values of EI based MR fluid is attributed to the lower magnetization and polydispersity values. The dynamic yield stress showed a decrease of 18.73% and 61.8% for field strengths of 177 mT and 531 mT, respectively as the temperature was increased from 293 to 323 K. The optorheological studies showed a peak in the loss moduli, close to the crossover point of the storage and loss moduli, due to freely moving large sized aggregates along the shear direction that are dislodged from the rheometer plates at higher strains. Our results suggests that EI based MR fluids have magnetorheological behavior comparable to that of CI based MR fluids. As EI is much cheaper than CI, our findings will have important commercial implications in producing cost effective EI based MR fluids.

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“…MR applications can experience temperature variation in service as a result of external and internal heating sources such as ambient atmospheric temperature, dissipated mechanical energy due to friction and damping, dissipated electrical energy due to electromagnetic circuit. Generally, the increased temperature is known to reduce the yield stress and the viscosity of conventional MRFs [39,40]. Evaluating the temperature dependence of the HVLP MRFs is important for practical MR application.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Synthesis and rheological characteristics of high viscosity linear polysiloxane carrier fluid-based magnetorheological fluids

Xie

Choi

Liao

et al. 2021

Smart Mater. Struct.

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This study addresses the synthesis and field-dependent rheological characteristics of novel magnetorheological fluids (MRFs) using high viscosity linear polysiloxanes (HVLPs) as a carrier fluid. First of all, the components and preparation of novel HVLP-based MRFs (HVLP MRFs) were explained in detail and the microscopic images of each component were taken by using scanning electron microscope (SEM). Four HVLP MRF samples with different particle volume fractions of 10, 15, 20, and 26 vol% in the same HVLP carrier fluid viscosity of 800 Pa·s were synthesized to investigate the particle concentration effect on their field-dependent rheological properties. In order to understand the effect of the carrier fluid viscosity, two more HVLP MRF samples with different HVLP viscosities of 140 and 440 Pa·s in the same particle concentration of 26 vol% were also fabricated. In addition, the temperature effect on HVLP MRFs was studied by using the sample with 26 vol% in particle concentration and 140 Pa·s in HVLP viscosity under different operating temperatures of 25, 40, 55 and 70℃. The flow curve measurements of shear stress versus shear rate in the magnetic fields were conducted by using controlled shear rate (CSR) test method with a commercial parallel-plate type rotational rheometer. From the flow curves, the field-dependent rheological properties of HVLP MRFs including static and dynamic yield stresses and the dynamic range (ratio of field on to field off yield stress) were obtained. These material characteristics were then examined as a function of varying particle concentration, varying carrier fluid viscosity, and varying temperature. A conventional commercial MRF (i.e., Lord MRF-126CD) was adopted for comparison study and its rheological properties under different temperatures were also measured and compared with those of HVLP MRFs. Using HVLP carrier fluids, it was demonstrated that the HVLP MRFs exhibited much greater suspension stability than the conventional commercial MRF.

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Temperature Dependence of MR Fluids

Cited by 12 publications

References 4 publications

Optimizing the Magnetic Response of Suspensions by Tailoring the Spatial Distribution of the Particle Magnetic Material

Optimizing the Magnetic Response of Suspensions by Tailoring the Spatial Distribution of the Particle Magnetic Material

Magnetorheological properties of sodium sulphonate capped electrolytic iron based MR fluid: a comparison with CI based MR fluid

Synthesis and rheological characteristics of high viscosity linear polysiloxane carrier fluid-based magnetorheological fluids

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