Instabilities in the Poiseuille flow of a magnetorheological carbonyl-iron suspension.

8th International Congress of Engineering Physics

物理学;工业技术

Méndez, A.^1 ; Pérez, L.^1 ; Rivera, I.^1 ; Paniagua, A.^1

Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Edif. 9 Unidad Profesional Adolfo López Mateos, Col. San Pedro Zacatenco, Ciudad de México

C. P. 07730, Mexico^1

关键词: Bingham behavior;    Capillary rheometer;    Flow instabilities;    Glass capillaries;    Magneto-rheological;    Magnetorheological suspensions;    Poiseuille flow;    Shear-thinning behavior;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/792/1/012018/pdf
DOI  :  10.1088/1742-6596/792/1/012018

学科分类：工业工程学

来源: IOP

【 摘 要 】

The flow of a magnetorheological suspension in the Poiseuille flow is studied in this work. A capillary rheometer was constructed and designated in order to adapt a magnetic field perpendicular to the flow direction covering the entire capillary zone; this restricts the maximum length of the glass capillary. A Newtonian suspension of carbonyl iron in glycerol at 20% in volume was studied at several intensities of magnetic field. The results showed a close-Bingham behavior at lower intensities of magnetic field. But a deviation is seen at higher intensities accompanied with a clearly shear thinning behavior with flow instabilities. These instabilities were evidenced by oscillations in shear rate and increased with the magnetic field and the shear stress.