Rheology and microstructural evolution in pressure-driven flow of a magnetorheological fluid with strong particle–wall interactions

The interaction between magnetorheological (MR) fluid particles and the walls of the device that retain the field-responsive fluid is critical as this interaction provides the means for coupling the physical device to the field-controllable properties of the fluid. This interaction is often enhanced...

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Bibliographic Details
Published in:Journal of intelligent material systems and structures 2012-06, Vol.23 (9), p.969-978
Main Authors: Ocalan, Murat, McKinley, Gareth H.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Devices
Electro- and magnetorheological fluids
Evolution
Exact sciences and technology
Ferromagnetism
Fluid dynamics
Fluid flow
Fluids
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Magnetorheological fluids
Material types
Microstructure
Physics
Rheology
Transducers
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Summary:The interaction between magnetorheological (MR) fluid particles and the walls of the device that retain the field-responsive fluid is critical as this interaction provides the means for coupling the physical device to the field-controllable properties of the fluid. This interaction is often enhanced in actuators by the use of ferromagnetic walls that generate an attractive force on the particles in the field-on state. In this article, the aggregation dynamics of MR fluid particles and the evolution of the microstructure in pressure-driven flow through ferromagnetic channels are studied using custom-fabricated microfluidic devices with ferromagnetic sidewalls. The aggregation of the particles and the time-dependent evolution in the microstructure is studied in rectilinear, expansion and contraction channel geometries. These observations help identify methods for improving MR actuator design and performance.
ISSN:1045-389X
1530-8138
DOI:10.1177/1045389X11429601