Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (3): 383-388.DOI: 10.12068/j.issn.1005-3026.2018.03.016

• Mechanical Engineering • Previous Articles     Next Articles

Chain Formation and Agglomeration Characterization of Magnetic Particles in Magnetorheological Fluids

MA Liang1,2, XIAO Ping2, WANG Ren-sheng1,3, XIU Shi-chao1   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China; 2. Department of Mechanical Engineering, Xinjiang Institute of Engineering, Urumqi 830091, China; 3. School of Mechanical Engineering, Liaoning Institute of Science and Technology, Benxi 117004, China.
  • Received:2016-09-14 Revised:2016-09-14 Online:2018-03-15 Published:2018-03-09
  • Contact: MA Liang
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Abstract: Thermal motion behavior has an unneglectable disturbing effect on the agglomeration and rheological characteristics of nano-size magnetorheological fluids(MRFs).To discover the relationship between microstructure and thermal motion in MRFs with external magnetic fields applied, the thermal proportion of total energy with different diameters of carbonyl iron particles (CIPs) was discussed. The CCD method was employed to analyze the CIPs’ position data set calculated by Monte Carlo simulation, and a systematic thermal coupling coefficient<λ>regression model related to magnetic induction intensity, CIPs’ diameter and volume concentration was built. The threshold particle diameter value calculated by the model is 23% higher than the empirical value in the literature, which proves that rheological characteristic has a stricter precondition with multiple factors considered in MRFs.

Key words: magnetorheological fluids(MRFs), thermal coupling parameter, central composite design(CCD), experiment design, rheological characteristic

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