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Abstract <p>An experimental investigation was made of the viscous friction of the coaxial layer of a magnetic fluid between the inner wall of a nonmagnetic tube and a cylindrical assembly of permanent magnets during translational motion of the latter. The results of measurements of friction coefficient were compared with the results of calculations within the framework of analytical models. It was shown that the model prohibiting the flow of the magnetic fluid from the gap gives the best estimate of the friction coefficient. Several series of experiments on laboratory models differing in geometrical dimensions and aspect ratio of magnetic bodies have accumulated experimental data confirming the type of Couette–Poiseuille hydrodynamic flow in the system under study.</p>

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Experimental Verification of Couette–Poiseuille Flow of a Magnetic Fluid Filling the Coaxial Gap between the Inner Magnetic and Outer Nonmagnetic Walls

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • A. S. Ivanov,
  • M. A. Koskov,
  • S. A. Somov

摘要

Abstract

An experimental investigation was made of the viscous friction of the coaxial layer of a magnetic fluid between the inner wall of a nonmagnetic tube and a cylindrical assembly of permanent magnets during translational motion of the latter. The results of measurements of friction coefficient were compared with the results of calculations within the framework of analytical models. It was shown that the model prohibiting the flow of the magnetic fluid from the gap gives the best estimate of the friction coefficient. Several series of experiments on laboratory models differing in geometrical dimensions and aspect ratio of magnetic bodies have accumulated experimental data confirming the type of Couette–Poiseuille hydrodynamic flow in the system under study.