Clark C, Jin W, Glaser A
Department of Manufacturing and Engineering Systems Brunel University, Uxbridge, Middlesex, U.K.
Int J Artif Organs. 1990 Dec;13(12):814-22.
Flow visualisation and velocity measurement studies have been carried out on the liquid side of a sac-type VAD. The objectives have been to identify both good (e.g. short residence times) and bad (e.g. high turbulence levels) flow characteristics. The flow was visualised using polystyrene micro-spheres illuminated with white light on selected transverse planes across the pumping chamber and its inlet and outlet connections. These results then served as a guide for velocity measurements using laser-Doppler anemometry. Flow tests were run using water or a water/glycerol mixture. Operating conditions were determined from the appropriate fluid mechanics modelling laws to ensure dynamical similarity. Initially, steady flow behaviour was investigated including the effects of removal and insertion of the tilting-disc inlet and outlet valves. In subsequent full pumping tests, using a pneumatic driver, regions of high shear, separation, and high turbulence intensity have been identified.
已对囊式心室辅助装置的液体侧进行了流动可视化和速度测量研究。目的是识别良好的（例如停留时间短）和不良的（例如湍流水平高）流动特性。通过在穿过泵腔及其进出口连接的选定横向平面上用白光照射聚苯乙烯微球来实现流动可视化。然后这些结果为使用激光多普勒测速仪进行速度测量提供了指导。使用水或水/甘油混合物进行流动测试。根据适当的流体力学建模定律确定操作条件，以确保动力学相似性。最初，研究了稳定流动行为，包括倾斜盘式进出口阀的移除和插入的影响。在随后使用气动驱动器的全泵浦测试中，已识别出高剪切、分离和高湍流强度区域。
