Experimental study of the fluidity of nanostructured magnetic fluid in a strong magnetic field
A.N. Bolotov, O.O. Novikova
Tver State Technical University
DOI: 10.26456/pcascnn/2023.15.692
Original article
Abstract: Based on magnetic fluids, new effective technical devices have been implemented, such as magnetic fluid bearings, seals, and dampers. The magnetic-viscous effect inherent to magnetic fluids can not only improve the properties of magnetic fluid units, but significantly complicate their operation after a long stop. This refers to the so-called «stop effect», which occurs due to an abnormally high limiting shear stress in a nanostructured liquid. The plastic properties of the magnetic fluid are experimentally studied depending on the following parameters: shear stress, temperature, structure formation time. The destruction of the nanostructure of the magnetic fluid begins after the shear stress exceeds a certain critical value. At stresses below the critical, but above the limiting shear stress, the displacement of the solid surface occurs by overcoming the boundary friction of the magnetic fluid on the solid surface. The experimentally established exponential course of the temperature dependence of the shear rate reflects the nature of the forces that determine the internal friction in the magnetic fluid.
Keywords: magnetic fluid, yield strength, nanodispersed particles, magnetic interaction, chain model
- Alexander N. Bolotov – Dr. Sc., Professor, Head of the Applied Physics Department, Tver State Technical University
- Olga O. Novikova – Ph. D., Full Docent, Applied Physics Department, Tver State Technical University
Reference:
Bolotov, A.N. Experimental study of the fluidity of nanostructured magnetic fluid in a strong magnetic field / A.N. Bolotov, O.O. Novikova // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2023. — I. 15. — P. 692-700. DOI: 10.26456/pcascnn/2023.15.692. (In Russian).
Full article (in Russian): download PDF file
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