Abstract
The flow in the impeller of a centrifugal blood pump developed at the National Cardiovascular Center of Japan was clearly visualized by the oil film method to illustrate the overall flow structure inside the open-type impeller. The results showed that the main stream went along the pressure surface with a backward flow at the inlet. Large-scale vortices were formed near both tips of the suction side, and a low-velocity area was found in the middle of the suction side that could be eliminated by increasing the flow rate. These findings were helpful for improving the design of the impeller to enhance the hydraulic performance and the antithrombogenicity of the pump.
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