Abstract
Two centrifugal cardio pumps with recirculation region and anti-recirculation region are designed by speed coefficient method. We can obtain the flow distribution of impeller and inside the shell at design conditions from geometric modeling and numerical simulation of two cardio pumps by using related software, and compared the interior shear stress distribution of two cardio pumps at the same condition. The results show that the maximum shear stress in the cardio pump with the recirculation region is lower about 10% than the pump with the anti-recirculation region and the region of the shear stress is exceed the critical shear stress (150Pa) which produced hemolytic is less about 2/3 than the cardio pump with the anti-recirculation region from the shear stress distribution. As a result a tiny destroys are caused to the blood cell and the pump with the anti-recirculation region model correspond with the demand of the haemophysiology, the research results provide the theory reference and basis in the optimization design for such artificial cardio pump.
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