Numerical simulation and comparative analysis of flow field in axial blood pumps
Numerical simulation and comparative analysis of flow field in axial blood pumps
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DOI：
10.1080/10255842.2012.715156
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发表时间：
2014-03
影响因子：
1.6
通讯作者：
Yuhua Peng;Yaqin Wu;Xiaoying Tang;Weifeng Liu;Duanduan Chen;Tianxin Gao;Yong Xu;Yanjun Zeng
中科院分区：
文献类型：
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作者：
Yuhua Peng;Yaqin Wu;Xiaoying Tang;Weifeng Liu;Duanduan Chen;Tianxin Gao;Yong Xu;Yanjun Zeng
通过对血泵内部流场的模拟，评价血泵的流变特性和生理相容性。本文采用计算流体力学的方法，对三叶扩压器和六叶扩压器的两种轴流式血泵模型（泵Ⅰ和泵Ⅱ）进行了数值模拟和分析，比较了两种血泵在满足正常人体血压差和血流量条件下的流态。结果表明：（i）在扩散器和转子之间产生了高剪切力，这是导致溶血的关键部位;（ii）在100 mmHg压头和5 l/min流量条件下，两种血泵的溶血性能差异显著。两种泵的溶血指数分别为0.32%和0.2%。总之，血泵的性能受扩散器叶片数的影响。泵II的性能优于泵I，可作为血泵选项的基本型号。
The objective study was to estimate the rheological properties and physiological compatibility of the blood pump by simulating the internal flow field of the blood pump. In this study we use computational fluid dynamics method to simulate and analyse two models of axial blood pumps with a three-blade diffuser and a six-blade diffuser, named pump I and pump II, respectively, and to compare the flow patterns of these two kinds of blood pumps while both of them satisfy the conditions of the normal human blood differential pressure and blood flow. Results indicate that (i) the high shear force occurs between the diffuser and the rotor in which the crucial place leads to haemolysis and (ii) under the condition of 100 mmHg pressure head and 5 l/min flow rate, the difference between the two kinds of blood pumps, as far as the haemolytic performance is concerned, is notable. The haemolysis index of the two pumps is 0.32% and 0.2%. In conclusion, the performance of the blood pump is influenced by the diffusers' blade number. Pump II performed better than pump I, which can be the basic model for blood pump option.