Hydraulic Analysis and Optimization in Impeller of Magnetically Levitated Centrifugal Blood Pump

2011 ◽  
Vol 121-126 ◽  
pp. 1204-1208 ◽  
Author(s):  
Hui Min Zhang ◽  
Qi Zhu

This article, on the basis of the magnetically levitated pumps developed by Ibaraki University, talks about fluid dynamic analysis of pump and optimization of parameters of the impellers. The pump uses blood as medium, with a flow rate Q of 5L/min, a pressure head H of 100mmHg. By using software of ANSYS CFX, the article analyzes the effect of shape, angle, height, length and thickness of the impeller on performance chart and fluid field distribution inside the pump. To fulfill the human requirements in blood pump, an optimization analysis is conducted to improve the uniformity of fluid field, reduce power and efficiency of the pump. As result, meeting the flow and pressure head condition, single curvature impeller is found to have lower speed, better efficiency and more uniform flow field, this helps to prevent the generation of thrombus and hemolytic.

Author(s):  
C N Pai ◽  
T Shinshi ◽  
A Shimokohbe

Evaluation of the hydraulic forces in a magnetically levitated (maglev) centrifugal blood pump is important from the point of view of the magnetic bearing design. Direct measurement is difficult due to the absence of a rotor shaft, and computational fluid dynamic analysis demands considerable computational resource and time. To solve this problem, disturbance force observers were developed, using the radial controlled magnetic bearing of a centrifugal blood pump, to estimate the radial forces on the maglev impeller. In order to design the disturbance observer, the radial dynamic characteristics of a maglev impeller were evaluated under different working conditions. It was observed that the working fluid affects the additional mass and damping, while the rotational speed affects the damping and stiffness of the maglev system. Based on these results, disturbance force observers were designed and implemented. The designed disturbance force observers present a bandwidth of 45 Hz. In non-pulsatile conditions, the magnitude of the estimated radial thrust increases in proportion to the flowrate, and the rotational speed has little effect on the force direction. At 5 l/min against 100 mmHg, the estimated radial thrust is 0.95 N. In pulsatile conditions, this method was capable of estimating the pulsatile radial thrust with good response.


ASAIO Journal ◽  
2001 ◽  
Vol 47 (2) ◽  
pp. 122
Author(s):  
T. Yamane ◽  
O. Maruyama ◽  
M. Nishida ◽  
M. Toyoda ◽  
Y. Miyamoto ◽  
...  

2007 ◽  
Vol 31 (4) ◽  
pp. 301-311 ◽  
Author(s):  
Junichi Asama ◽  
Tadahiko Shinshi ◽  
Hideo Hoshi ◽  
Setsuo Takatani ◽  
Akira Shimokohbe

ASAIO Journal ◽  
2013 ◽  
Vol 59 (3) ◽  
pp. 246-252 ◽  
Author(s):  
Eiki Nagaoka ◽  
Tatsuki Fujiwara ◽  
Takashi Kitao ◽  
Daisuke Sakota ◽  
Tadahiko Shinshi ◽  
...  

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