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<p>Magnetorheological (MR) fluids are suspensions composed of micron-sized magnetizable particles uniformly dispersed in a liquid carrier. Due to sedimentation effects, the MR fluid used in experiments required thorough stirring to ensure proper mixing of magnetic particles, carrier fluid, and additives, thereby achieving uniform dispersion of the magnetic particles within the fluid. However, during the stirring process, a significant amount of air bubbles may be introduced into the MR fluid, negatively impacting its stability. This paper primarily explores the effects of different air bubble volume fractions within the MR fluid on its performance. It compares the changes in magnetic flux density, normal stress, and shear stress by analyzing MR fluid samples of equal mass but with varying air bubble volume fractions. Experimental results show that under a constant current, a reduction in air bubble content leads to a gradual increase in magnetic flux density, reaching a peak of 330 mT. Additionally, as the magnetic flux density increases, the shear yield stress also rises, reaching its maximum value of 62.79&#xa0;kPa when the air content is reduced to 0.15%.</p> Graphical Abstract <p></p>

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Rheology of magnetorheological fluid dissolved into air bubble

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • X. H. Liu,
  • W. L. Wang,
  • Y. F. Shi,
  • X. C. Liu,
  • X. B. Han,
  • Y. G. Fu

摘要

Magnetorheological (MR) fluids are suspensions composed of micron-sized magnetizable particles uniformly dispersed in a liquid carrier. Due to sedimentation effects, the MR fluid used in experiments required thorough stirring to ensure proper mixing of magnetic particles, carrier fluid, and additives, thereby achieving uniform dispersion of the magnetic particles within the fluid. However, during the stirring process, a significant amount of air bubbles may be introduced into the MR fluid, negatively impacting its stability. This paper primarily explores the effects of different air bubble volume fractions within the MR fluid on its performance. It compares the changes in magnetic flux density, normal stress, and shear stress by analyzing MR fluid samples of equal mass but with varying air bubble volume fractions. Experimental results show that under a constant current, a reduction in air bubble content leads to a gradual increase in magnetic flux density, reaching a peak of 330 mT. Additionally, as the magnetic flux density increases, the shear yield stress also rises, reaching its maximum value of 62.79 kPa when the air content is reduced to 0.15%.

Graphical Abstract