Ikeda T, Yamane T, Orita T, Tateishi T
Biomimetrics Division, Mechanical Engineering Laboratory, Tsukuba, Japan.
Artif Organs. 1996 Feb;20(2):132-8. doi: 10.1111/j.1525-1594.1996.tb00715.x.
A quantitative flow visualization study of a scaled-up model of a centrifugal blood pump was performed. Since the size of the scaled-up model was three times as large as the original pump under development, and the kinematic viscosity of the saline solution used as the working fluid was approximately one-third that of the blood, we obtained a similar flow at one twenty-seventh the angular velocity of the original pump. The flow was visualized by seeding the saline solution with neutrally buoyant particles and by illuminating the model with a laser light sheet. Since the gap flow behind the impeller is important for thrombus formation, it was recorded by a high-speed video camera, and the velocity field was evaluated automatically by particle tracking velocimetry. It was shown that in the gap behind the impeller there existed a region where the velocity profile was almost flat which can be called a core region. The results indicated the effectiveness of the present visualization technique for centrifugal blood pumps.
对一个离心式血泵的放大模型进行了定量流动可视化研究。由于放大模型的尺寸是正在研发的原始泵的三倍，并且用作工作流体的盐溶液的运动粘度约为血液的三分之一，因此我们在原始泵角速度的二十七分之一时获得了相似的流动。通过用中性浮力颗粒对盐溶液进行播种并用激光片照射模型来可视化流动。由于叶轮后面的间隙流动对血栓形成很重要，因此用高速摄像机进行记录，并通过粒子跟踪测速法自动评估速度场。结果表明，叶轮后面的间隙中存在一个速度分布几乎平坦的区域，可称为核心区域。结果表明了当前可视化技术对离心式血泵的有效性。
