International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Computational Study of the Magnetically Suspended Centrifugal Blood Pump (2nd Report: Pressure Fluctuation and Stability of Impeller Rotation for Different Volute Shapes)

  • Ogami, Yoshifumi (Department of Mechanical Engineering, Ritsumeikan University) ;
  • Matsuoka, Daisuke (Department of Mechanical Engineering, Ritsumeikan University) ;
  • Horie, Masaaki (Department of Mechanical Engineering, Setsunan University)
  • Received : 2011.03.25
  • Accepted : 2011.11.28
  • Published : 2011.12.31
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Abstract

The turbo-type blood pump studied in this paper has an impeller that is magnetically suspended in a double volute casing. The impeller rotates with minimal fluctuations caused by fluid and magnetic forces. In order to improve stability of the rotating impeller and to facilitate long-term use, a careful investigation of the pressure fluctuations and of the fluid force acting on the impeller is necessary. For this purpose, two models of the pump with different volute cross-sectional area are designed and studied with computational fluid dynamics software. The results show that the fluid force varies with the flow rate and shape of the volute, that the fluctuations of fluid force decrease with increasing flow rate and that the vibratory movement of the impeller is more efficiently suppressed in a narrow volute.

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References

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