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ASAIO CARDIAC ABSTRACT

STREAMLINED DESIGN OF IMPELLER AND ITS CFD CERTIFICATION IN CENTRIFUGAL PUMP

Qian, K X1; Wang, F Q1; Ru, W M1; Zeng, P1; Yuan, H Y1

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Dr. Kantrowitz, a well-known researcher of artificial heart, once asked why we use curved blades in the impeller pump while others all apply straight vanes. The authors have recently certified the advantages of logarithmic spiral vanes and parabolic shrouds in the centrifugal pump by Computational Fluid Dynamics (CFD) technology. The logarithmic spiral vane and parabola shroud were derived from solving fundamental equations of divergence, motion and energy of blood flow, according to a three dimensional analytic design of the impeller, which theoretically enables the stream-lines and stream-surfaces to coincide with the blood contacting surfaces anywhere and any time. The CFD drawing has demonstrated that the flow pathway in a centrifugal pump has actually a shape of logarithmic spiral in vertical section (attached Fig.: right) and a parabola form in cross section. Therefore, the vane and shroud coincide with the flow path way In the authors' centrifugal pump. In the impeller with straight vanes (attached Fig.: left) and straight shrouds, there are separation and impact as well as re-circulation between main blood flow and the impeller channels, which have been long since recognized to be hematologically unfriendly.

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Copyright © 2004 by the American Society for Artificial Internal Organs