Mechanism of Artificial Heart by Takashi Yamane

Author:Takashi Yamane
Language: eng
Format: epub
Publisher: Springer Japan, Tokyo

Second interesting result of flow visualization regarding washout flow is a relative tangential velocity through the top gap or the bottom gap of the impeller. As I wrote, the flow at the impeller tip returns to the center keeping the momentum, namely increasing the tangential velocity. Then the tangential flow reaches the impeller rotational velocity, and the relative velocity between the impeller and the blood becomes zero at a certain radius.

Figure 6.7 shows the radial distribution of the tangential velocity of the blood and of the impeller. Figure 6.7 is a picture of canine experiment of an extracorporeal centrifugal pump, whose impeller is semi-open type. White circle was able to be seen after the experiment and that is presumably a platelet deposition, which is not harmful to human operation.

Fig. 6.7Comparison of a circular region of platelet deposition observed in an animal test and a region of zero relative velocity observed in a flow visualization [4]

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