Kontaktujte nás | Jazyk: čeština English
Název: | High-speed videomicroscopy of sheared carbonyl iron suspensions | ||||||||||
Autor: | Martínez-Cano, Óscar; Morillas, Jose R.; Cvek, Martin; Ramírez, Javier; de Vicente, Juan | ||||||||||
Typ dokumentu: | Recenzovaný odborný článek (English) | ||||||||||
Zdrojový dok.: | Smart Materials and Structures. 2023, vol. 32, issue 2 | ||||||||||
ISSN: | 0964-1726 (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1088/1361-665X/acaadc | ||||||||||
Abstrakt: | The postyield rheological regime is investigated in sheared magnetic field-responsive composites (i.e. carbonyl iron based magnetorheological fluids). When subjected to uniaxial DC fields, high-speed videomicroscopy techniques and dedicated image analysis tools demonstrate that dispersed magnetic microparticles self-assemble to form concentric layered patterns above a particular shear rate ( γ ˙ R ,c ). This critical shear rate for layer formation is dictated by a critical Mason number M n c ∼ 1 that is associated to the destruction of the last doublet in the chain-like aggregates. The number of layers, mean width, percentage of occupation and mean period are found to be very weakly dependent on the shear rate in start-up shearing flow tests. Experimental data for the mean period are in good agreement with an energy minimization theory. | ||||||||||
Plný text: | https://iopscience.iop.org/article/10.1088/1361-665X/acaadc | ||||||||||
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