Nondimensional scaling of magnetorheological rotary shear mode devices using the Mason number

Becnel, Andrew C.; Sherman, Stephen G.; Hu, Wei; Wereley, Norman M.

doi:10.1016/j.jmmm.2014.10.049

Cited by 32 publications

(17 citation statements)

References 17 publications

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“…54,55 Under a fixed particle concentration, a master curve for the specific viscosity (ratio of the apparent viscosity to medium viscosity) and volume fraction correction versus γ/M 2 at different magnetic field strengths can be obtained, and the behaviors of different MR fluids can be compared. 55,56 Figure 9a shows the corrected viscosity curve versus γ/M 2 for the capped Fe 3 O 4 and the HS-Fe 3 O 4 suspensions at two different magnetic field strengths. All the data could be overlapped with each other, which means the behaviors of the two suspensions were the same as following the same scaling law.…”

Section: Figures 2ab Show Sem Images and Figuresmentioning

confidence: 99%

Hierarchically Structured Fe₃O₄ Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Choi

Han

Nam

et al. 2020

ACS Appl. Nano Mater.

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The magnetic Fe3O4 nanoparticles were produced by chemical precipitation from ferric chloride (FeCl3) and ferrous chloride (FeCl2) in an alkaline medium (ammonia hydroxide). The magnetic particle suspension was stabilized with citric acid. Hierarchically structured Fe3O4 (HS-Fe3O4) particles of submicrometer size were successfully produced from citric acid-capped Fe3O4 solution by using a simple electrospray (ES) process and applied for magnetorheolgical (MR) fluids. Submicrometer-sized spherical HS-Fe3O4 particles were formed by evaporation of the solvent and agglomeration of capped Fe3O4 particles during the ES process. With formation of hierarchically structured particles, the density of HS-Fe3O4 particles (ρ = 3.32 g/cm3) was noticeably decreased from that of the capped Fe3O4 (ρ = 4.29 g/cm3) without use of light materials, while the saturation magnetization was comparable to primary capped Fe3O4 (M s = 73 emu/g). The MR fluid based on the submicrometer HS-Fe3O4 particles showed better MR performance with a large static yield stress (337 Pa), which was 300% greater than that of the hollow polymer/Fe3O4 suspension. Reduced density mismatch between the particles and the silicon oil medium significantly improved the stability of the HS-Fe3O4 suspension compared to the pure Fe3O4 suspension. The high MR performance and the improved sedimentation stability showed a possibility of the practical application of the submicrometer HS-Fe3O4 particle suspensions to microfluidic devices.

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Section: Figures 2ab Show Sem Images and Figuresmentioning

confidence: 99%

Hierarchically Structured Fe₃O₄ Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Choi

Han

Nam

et al. 2020

ACS Appl. Nano Mater.

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“…. − Corrected viscosity curves for γ̇/ M 2 for the Co 0.4 Fe 0.4 Ni 0.2 and CNT-Co 0.4 Fe 0.4 Ni 0.2 fluids are compared in Figure S4. All four curves overlap well with each other irrespective of the Co 0.4 Fe 0.4 Ni 0.2 content and the magnetic field strength, showing the MR behavior of the two samples is the same irrespective of the magnetic field strength.…”

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confidence: 99%

Synergistic Effects of Nonmagnetic Carbon Nanotubes on the Performance and Stability of Magnetorheological Fluids Containing Carbon Nanotube-Co_0.4Fe_0.4Ni_0.2 Nanocomposite Particles

Choi

Nam

Kim³

et al. 2021

Nano Lett.

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We investigated the magnetorheological (MR) properties of the carbon nanotube (CNT)-Co 0.4 Fe 0.4 Ni 0.2 composite suspension to find a high-performance MR fluid with excellent stability. The composites were fabricated by chemical reduction of Co 0.4 Fe 0.4 Ni 0.2 on the surface of amine-functionalized CNTs. A synergistic effect between the high aspect ratio of the CNTs and the strong magnetic polarization of the Co 0.4 Fe 0.4 Ni 0.2 led to stronger MR performance of the nanocomposite particle suspension. The MR fluid exhibits an unexpected high yield stress value that is 13 times greater than that of a CNT-Fe 3 O 4 suspension at a magnetic field strength of 343 kA/m. Nonmagnetic CNTs form a three-dimensional networklike structure, imparting surprisingly large additional yield stress to the CNT-Co 0.4 Fe 0.4 Ni 0.2 nanocomposite MR suspension. The low density of the CNTs resulted in much better long-term stability for the CNT-Co 0.4 Fe 0.4 Ni 0.2 nanocomposite suspension than the MR fluid containing only Co 0.4 Fe 0.4 Ni 0.2 .

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“…In our study, we define two Mason numbers: one which is the ratio between the shear forces and the magnetic interaction forces in Poiseuille flow, and another one for Couette flow. The magnetic interaction forces are characterized by the yield stress τ y [41,42].…”

Section: A Model For Mr Fluid In Poiseuille-couette Flowmentioning

confidence: 99%

Dynamic Sealing Using Magnetorheological Fluids

et al. 2018

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Micropumps are microfluidic components which are widely used in applications such as chemical analysis, biological sensing and micro-robots. However, one obstacle in developing micropumps is the extremely low efficiency relative to their macro-scale counterparts. This paper presents a dynamic sealing method for external gear pumps to reduce the volumetric losses through the clearance between the tips of gears and the housing by using magneto-rheological (MR) fluids. By mitigating these losses, we are able to achieve high efficiency and high volumetric accuracy with current mechanical architectures and manufacturing tolerances. Static and dynamic sealing using MR fluids are investigated theoretically and experimentally. Two Mason numbers M n (p) and M n (Ω) which are defined in terms of pressure gradient of the flow and velocity of the moving boundary respectively are used to characterize and evaluate the sealing performance. A range of magnetic field intensities is explored to determine optimal sealing effectiveness, where effectiveness is evaluated using the ratio of volumetric loss and friction factor. Finally, we quantify the effectiveness of this dynamic sealing method under different working conditions for gear pumps.

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Nondimensional scaling of magnetorheological rotary shear mode devices using the Mason number

Cited by 32 publications

References 17 publications

Hierarchically Structured Fe₃O₄ Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Hierarchically Structured Fe₃O₄ Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Synergistic Effects of Nonmagnetic Carbon Nanotubes on the Performance and Stability of Magnetorheological Fluids Containing Carbon Nanotube-Co_0.4Fe_0.4Ni_0.2 Nanocomposite Particles

Dynamic Sealing Using Magnetorheological Fluids

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Nondimensional scaling of magnetorheological rotary shear mode devices using the Mason number

Cited by 32 publications

References 17 publications

Hierarchically Structured Fe3O4 Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Hierarchically Structured Fe3O4 Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Synergistic Effects of Nonmagnetic Carbon Nanotubes on the Performance and Stability of Magnetorheological Fluids Containing Carbon Nanotube-Co0.4Fe0.4Ni0.2 Nanocomposite Particles

Dynamic Sealing Using Magnetorheological Fluids

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Hierarchically Structured Fe₃O₄ Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Hierarchically Structured Fe₃O₄ Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability

Synergistic Effects of Nonmagnetic Carbon Nanotubes on the Performance and Stability of Magnetorheological Fluids Containing Carbon Nanotube-Co_0.4Fe_0.4Ni_0.2 Nanocomposite Particles