The Study of Various Impeller Design for Centrifugal Blood Pump Using Computer Method

Praemai Wannawat, Nutchanant Foojinphan, Thananya Khienwad, and Phornphop Naiyanetr

Keywords

Centrifugal blood pump, Impellers, Shear stress, Simulation

Abstract

A centrifugal blood pump is a meaningful device for heart failure patients. However, the centrifugal blood pump causes side effects to blood for long term used; thrombosis and hemolysis, both factors relate to shear stress, therefore, the pump must be well-designed in order to decrease shear stress. Three types of impellers were designed; backward, forward and straight impeller. Each designed impellers and original impeller were compared together to determine the appropriate impeller for the blood pump. The study separates to 2 parts; a simulation and an experiment. Since the interaction between impeller wall and blood can’t be seen. FLUENT is used to study a pump performance and shear stress at both impeller and housing. The Experiment was set to study real pump performance and to assure that the simulation results are correct. In conclusion, at desired flow rate (5 L/min) and speed more than 2000 rpm, every impellers can generate a head pressure to prevent a suction flow (>80 mmHg). For shear stress consideration, almost of shear stress were less than 300 pa. The backward impeller is the most appropriate for the blood pump due to the least shear stress generation.

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