Praemai Wannawat, Nutchanant Foojinphan, Thananya Khienwad, and Phornphop Naiyanetr
Centrifugal blood pump, Impellers, Shear stress, Simulation
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
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.