Manyetoreolojik (MR) Akışkanların Kapalı Durum Viskozitesinin İncelenmesi
Bu çalışmada silikon yağ ve demir (Fe) bazlı manyetoreolojik (MR) akışkanlarının kapalı durum (off-state) viskozite özellikleri incelenmiştir.Farklı oranlardaki manyetik faz miktarı (hacmen %5, 10, 20, 30 ve 40) ile hazırlanan MR akışkanlarının rölatif viskozitesinin (ηrel)– manyetik faz miktarına (φ) olan ilişkisi deneysel olarak tespit edilmiştir. Elde edilen veriler Mooney ve Krieger-Dougherty modelleriylekarşılaştırılmıştır. Deneysel sonuçlar MR akışkanın viskozitesinin manyetik faz miktarı ile önemli ölçüde arttığını göstermiştir. Ayrıca viskoziteprofilleri Mooney modeli ile uyumlu bulunmuştur.
Investigation of Off-State Viscosity of Magnetorheological (MR) Fluids
In this study the off-state viscosity characteristics of silicone oil and iron (Fe) based magnetorheological (MR) fluids were investigated. The relationship between relative viscosity (ηrel) and the amount of magnetic phase (φ) of MR fluids that were prepared with various concentrations of magnetic phase (5, 10, 20, 30, 40 vol%) was determined experimentally. The data obtained from experimental study were compared with Mooney and Krieger-Dougherty models. The experimental results showed that the viscosity had a shear thinning behavior and it increased significantly with increasing magnetic phase. Besides, the viscosity profile was found to be in good agreement with Mooney model.
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- [1] Genc, S ve Phule, P.P., (2002). Rheological properties of
magnetorheological fluids. Smart Materials and Structures,
11(1), 140-146.
- [2] Choi H. J., Taeg, M., Kwon, M. Jhon, S. (2000). Viscosity
of Magnetic Particle Suspensions. Journal of Magnetism and
Magnetic Materials, 209, 228-230.
- [3] Smith, T. L. ve Bruce C. A.,(1979). Intrinsic viscosities and
other rheological properties of flocculated suspensions of
non-magnetic and magnetic ferric oxides. Journal of Colloid
and Interface Science, 72, 13-26.
- [4] Jeon, J. ve Koo, S., (2012). Viscosity and dispersion state of
magnetic suspensions. Journal of Magnetism and Magnetic
Materials, 324(4), 424-429.
- [5] Sundar, L. S., Ramana, E. V., Singh, M. K., & De Sousa, A. C.
M. (2012). Viscosity of low volume concentrations of magnetic
Fe3O4 nanoparticles disp ersed in ethylene glycol and
water mixture. Chemical physics letters, 554, 236-242.
- [6] Rich, J. P., Doyle P.S., ve McKinley G.H., (2012). Magnetorheology
in an aging, yield stress matrix fluid. Rheologica
Acta, 51(7), 579-593.
- [7] Jolly M.R., Bender, J.W., ve Carlson, J.D., (1999). Properties
and applications of commercial magnetorheological fluids.
Journal of Intelligent Material Systems and Structures,
10(1), 5-13.
- [8] Ginder, J. M., Davis, L.C., ve Elie L.D., (1996). Rheology
of magnetorheological fluids: Models and measurements. International
Journal of Modern Physics B, 10(23-24), 3293-
3303.
- [9] Carlson, J.D., Catanzarite, D.M.ve StClair, K.A., (1996).
Commercial magnetorheological fluid devices. International
Journal of Modern Physics B, 10(23-24), 2857-2865.
- [10] Yuanling, S., Xiaolin L., and Jianfeng C., (2004). The maximum
solid loading and viscosity estimation of ultra-fine Ba-
TiO3 aqueous suspensions. Colloids and Surfaces A: Physicochemical
and Engineering Aspects, 247(1), 27-34.
- [11] Falk, V. ve D’Ortona, U. A., (2002). Polydisperse sedimentation
and polydisperse packing model. Powder technology,
128(2), 229-235.
- [12] Krieger, I.M., ve Dougherty, T.J., (1959). A mechanism for
non-Newtonian flow in suspensions of rigid spheres. Journal
of Rheology, 3, 137.
- [13] Liu, D. M. ve Tseng, W. J., (2000). Rheology of injection-
molded zirconia-wax mixtures. Journal of Materials
Science, 35(4), 1009-1016.
- [14] Bergstrm, L., Shinozaki, K., Tomiyama, H., & Mizutani, N.,
(1997). Colloidal processing of a very fine BaTiO3 powder-
effect of particle interactions on the suspension properties,
consolidation, and sintering behavior. Journal of the American
Ceramic Society, 80(2), 291-300.
- [15] Mooney, M., (1951). The viscosity of a concentrated suspension
of spherical particles. Journal of Colloid Science, 6(2),
162-170.
- [16] Tseng, W.J.ve Li, S.Y., (2002). Rheology of colloidal BaTiO3
suspension with ammonium polyacrylate as a dispersant. Materials
Science and Engineering: A, 333(1), 314-319.