A magnetic fluid seal for rotary blood pumps: Image and computational analyses of behaviors of magnetic fluids
A magnetic fluid seal for rotary blood pumps: Image and computational analyses of behaviors of magnetic fluids
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DOI：
10.1109/embc.2013.6609587
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Y. Mitamura;T. Yano;E. Okamoto
中科院分区：
文献类型：
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作者：
Y. Mitamura;T. Yano;E. Okamoto
磁性流体（MF）密封具有优异的耐用性。然而，有报道称MF密封的性能在液体中（几天）会下降。我们开发了一种具有屏蔽机制的中频密封。这只海豹在水中完美地呆了275天。为了研究屏蔽的影响，对水中密封中多孔材料的行为进行了实验和计算研究。(a)在离心泵内安装了两种带屏蔽和不带屏蔽的MF密封。用摄像机和高速显微镜观察了水中海豹体内微纤维的行为。在无屏蔽密封条件下，密封内水面的波动和紊流影响了介质的性能。相比之下，即使在高转速下，MFs在密封中也能稳定地旋转。(b)计算流体动力学分析表明，密封中存在固定的二次流模式，磁流体和水在界面处的速度差较小。这些磁场特性延长了磁场密封在水中的使用寿命。
A magnetic fluid (MF) seal has excellent durability. The performance of an MF seal, however, has been reported to decrease in liquids (several days). We have developed an MF seal that has a shield mechanism. The seal was perfect for 275 days in water. To investigate the effect of a shield, behaviors of MFs in a seal in water were studied both experimentally and computationally. (a) Two kinds of MF seals, one with a shield and one without a shield, were installed in a centrifugal pump. Behaviors of MFs in the seals in water were observed with a video camera and high-speed microscope. In the seal without a shield, the surface of the water in the seal waved and the turbulent flow affected behaviors of the MFs. In contrast, MFs rotated stably in the seal with a shield in water even at high rotational speeds. (b) Computational fluid dynamics analysis revealed that a stationary secondary flow pattern in the seal and small velocity difference between magnetic fluid and water at the interface. These MF behaviors prolonged the life of an MF seal in water.