Computational Fluid Dynamic Analysis of the Flow around the Pivot Bearing of the Centrifugal Ventricular Assist Device
Computational Fluid Dynamic Analysis of the Flow around the Pivot Bearing of the Centrifugal Ventricular Assist Device
复制标题
离心心室辅助装置枢轴轴承周围流动的计算流体动力学分析
DOI：
10.1299/jsmec.49.837
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
T. Tsutsui
中科院分区：
文献类型：
--
作者：
Takashi Yamane;O. Maruyama;T. Tsutsui
流动机制内的单轴离心泵澄清，以防止周围的枢轴轴承停滞，这可能导致血栓形成。我们重点研究了泵的几何效应，包括冲蚀孔直径、枢轴摩擦面积和叶轮相对于枢轴轴承周围冲蚀的后间隙宽度的影响。通过计算流体动力学分析，仔细检查了枢轴轴承周围的流动模式，包括冲洗孔内和叶轮后间隙内的区域。基于计算流体动力学分析结果，发现冲蚀孔直径与叶轮后间隙宽度之间存在平衡关系，影响了流向枢轴轴承的二次流，消除了枢轴轴承周围的滞止现象。此外，枢轴摩擦面积的增加消除了枢轴轴承周围的停滞，同时也增加了泵内的溶血。
Flow mechanisms within a monopivot centrifugal pump were clarified in order to prevent stagnation around the pivot bearing, which may cause thrombogenesis. We focused on the geometric effects of the pump, which included the effects of the washout hole diameter, the pivot friction area and the back gap width of the impeller relative to the washout around the pivot bearing. Flow patterns were carefully examined around the pivot bearing, including the region inside the washout hole and the back gap of the impeller, by computational fluid dynamic analysis. Based on the results from the computational fluid dynamic analyses, we found that a balance relationship between the washout hole diameter and the back gap width of the impeller affected the secondary flow toward the pivot bearing that eliminated the stagnation around the pivot bearing. In addition, while increasing in the pivot friction area eliminated stagnation around the pivot bearing, it also increased hemolysis within the pump.