Rheology and microstructural evolution in pressure-driven flow of a magnetorheological fluid with strong particle-wall interactions
Author(s)Ocalan, Murat; McKinley, Gareth H.
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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.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory
Journal of Intelligent Material Systems and Structures
Ocalan, M., and G. H. McKinley. Rheology and Microstructural Evolution in Pressure-driven Flow of a Magnetorheological Fluid with Strong Particle-wall Interactions. Journal of Intelligent Material Systems and Structures 23, no. 9 (June 20, 2012): 969-978.
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