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Rotational viscosity effect on the stability of finite journal bearings lubricated by ferrofluids

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Abstract

This work investigates the dynamic behavior of finite hydrodynamic journal bearings lubricated by ferrofluids based on the Shliomis model that considers the rotational viscosity effects of ferromagnetic particles and their magnetic moment. A finite wire located out of the journal bearing system produces the applied magnetic field. The pressure field is computed by solving the modified Reynolds equation, obtained from Navier–Stokes equations for this kind of fluids, to evaluate the journal bearing dynamic characteristics. The evaluation of dynamic coefficients is based on the numerical perturbation approach. These allow obtaining the whirling frequency, critical mass and the threshold speed to determine the stability zone of the journal bearing. The resolution method is first validated in the particular case of a Newtonian fluid. Excellent agreement with the numerical results from the literature was observed.

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Authors and Affiliations

  1. Faculty of Sciences and Techniques, Hassan II University of Casablanca, P.O. Box 146, 28806, Mohammedia, Morocco

    Khalil Atlassi, Mohamed Nabhani & Mohamed El Khlifi

Authors
  1. Khalil Atlassi
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  2. Mohamed Nabhani
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  3. Mohamed El Khlifi
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Correspondence to Mohamed Nabhani.

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Technical Editor: Daniel Onofre de Almeida Cruz.

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Atlassi, K., Nabhani, M. & Khlifi, M.E. Rotational viscosity effect on the stability of finite journal bearings lubricated by ferrofluids. J Braz. Soc. Mech. Sci. Eng. 43, 548 (2021). https://doi.org/10.1007/s40430-021-03264-2

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  • DOI: https://doi.org/10.1007/s40430-021-03264-2

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