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首页> 外文期刊>Artificial Organs >Differences between blood and a newtonian fluid on the performance of a hydrodynamic bearing for rotary blood pumps.
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Differences between blood and a newtonian fluid on the performance of a hydrodynamic bearing for rotary blood pumps.

机译：血液和牛顿流体之间的区别在于旋转式血泵的流体动力轴承的性能。

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Assuming that blood has a constant viscosity is a common practice when designing rotary blood pumps (RBPs), where shear stresses are generally higher than in the human body. This eases the design and allows numerical simulations and bench top experiments to be performed with Newtonian fluids. However, specific flow conditions may cause a change in cell distribution leading to an apparent lower blood viscosity. It has been observed that decreasing the vessel diameters and increasing flow velocities contribute to this effect. Because a hydrodynamic bearing operates under flow conditions following this pattern, it is important to verify whether this effect also takes place when this type of bearing is applied to a RBP. Because the operation of a hydrodynamic bearing depends directly on the fluid viscosity, a local change in cell distribution in the bearing gap can be reflected in changes in the bearing performance. In this work, a spiral groove hydrodynamic bearing was tested with porcine blood in a specially built test rig. The generated suspension force, cross flow, and bearing torque were recorded and compared with the reference response when using a solution of water and glycerol. Experiments with porcine blood yielded lower suspension forces, lower flows, and lower bearing torques than when using the glycerol solution. An explanation could be a lower apparent viscosity due to inhomogeneity of blood cell concentrations. Therefore, it is crucial to consider the effective blood viscosity when designing hydrodynamic bearings for RBPs and performing experiments.
机译：在设计旋转血泵（RBP）时，通常假定血液具有恒定的粘度，在这种情况下，剪切应力通常高于人体。这简化了设计，并允许使用牛顿流体进行数值模拟和台式实验。但是，特定的流动条件可能会导致细胞分布发生变化，从而导致血液粘度明显降低。已经观察到，减小血管直径和增加流速有助于这种效果。由于流体动力轴承在遵循该模式的流动条件下运行，因此，当将这种类型的轴承应用于RBP时，验证这种影响是否也会发生很重要。因为流体动力轴承的运行直接取决于流体粘度，所以轴承间隙中孔分布的局部变化可以反映在轴承性能的变化中。在这项工作中，在特别建造的测试台中用猪血对螺旋槽流体动力轴承进行了测试。记录产生的悬浮力，错流和轴承扭矩，并在使用水和甘油溶液时将其与参考响应进行比较。与使用甘油溶液相比，用猪血液进行的实验产生的悬浮力更低，流量更低，轴承扭矩更低。一个解释可能是由于血细胞浓度不均匀导致表观粘度降低。因此，在为RBP设计流体动力轴承并进行实验时，考虑有效的血液粘度至关重要。

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