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Abstract

Artificial heart pumps have attracted the attention of researchers around the world as an alternative to the organ used in cardiac transplantation. Conventional centrifugal pumps are no longer considered suitable for long-term application because of the possibility of occurrence of blood leakage and thrombus formation around the shaft seal. To overcome this problem posed by the shaft seal in conventional centrifugal pumps, the magnetically suspended centrifugal pump has been developed; this is a sealless rotor pump, which can provide contact-free rotation of the impeller without leading to material wear. In Europe, clinical trials of this pump have been successfully performed, and these pumps are commercially available. One of the aims of our study is to numerically examine the internal flow and the effect of leakage flow through the gap between the impeller and the pump casing on the performance of the pump. The results show that the pressure head increases compared with the pump without a gap for all flow rates because of the leakage of the fluid through the gap. It was observed that the leakage flow rate in the pump is sufficiently large; further, no stagnant fluid or dead flow regions were observed in the pump. Therefore, the present pump can efficiently enhance the washout effect.

참고문헌 (15)

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  6. Akamatsu, T., et al., 1992, “Centrifugal Blood Pump with a Magnetically Suspended Impeller,” Artificial Organs,Vol. 16, No. 3, pp. 305-308 
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  8. Terumo Heart Inc. Press Releases, http://www.terumo.co.jp/English/press/2007/005.html. 
  9. Kurokawa, J., et al., 1990, “Characteristics of Spiral Pump at Low Specific Speed (in Japanese),” Turbomachinery, Vol. 18, No. 5, pp. 300-307. 
  10. Kurokawa, J., et al., 1997, “Characteristics of Impeller at Very Low Specific Speed (in Japanese),” Turbomachinery, Vol. 25, No. 7, pp. 337-345. 
  11. Matsui, J. et al., 2006,“Application of Circular Casing to the Centrifugal Pump of Low Specific Speed and the Internal Flow (in Japanese),” Turbo machine, Vol. 34, No. 8, pp. 463-470. 
  12. Chua, L.P., et al.,2006, “Numerical Analysis of the Inner Flow Field of a Biocentrifugal Blood Pump,” Artificial Organs,Vol. 30, No. 6,pp. 467-477. 
  13. Chua, L.P., et al.,2005,“Computational Fluid Dynamics of Gap Flow in a Biocentirifugal Blood Pump,” Artificial Organs, Vol. 29, No. 8, pp. 620-628. 
  14. Ansys Inc.,2002,FLUENT 6.0 User’s Guide. 
  15. Ferziger, J. H., 2001, Computational Methods for Fluid Dynamics, Springer, New York. 

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