高剪切稳态载荷条件下人体血液润滑模型与仿真

Research on the Lubricant Model of Human Blood under Steady Load and High Shear Rate

根据血液流变学和流体力学理论,建立了血液在高剪切稳态载荷条件下血液润滑的数学模型。结合外场驱动微型轴流式血泵计算了血泵叶轮转子轴承在血液润滑条件下润滑膜的压力分布、承载能力、摩擦力、摩擦功耗等参数。分析了摩擦润滑指标与轴承配合间隙及叶轮转子转速之间的关系。结果表明,轴承配合间隙越小、转速越高,轴承的承载能力越大,但小间隙不利于血液分子的充分流动,高速将明显增加摩擦功耗。外场驱动血泵转子轴承配合间隙应选为0.002 mm。

ccording to the hemorheology and hydrodynamics, the lubricant model of human blood at steady load and high shear-rate was established. Aimed to the blood pump driven by the extra magnetic field, the pressure distributing, the load capacity of blood lubricants film, friction and the power loss resulted from friction were calculated. The relationship between the lubricant indexes and the match clearance of the bearing and the revolving speed of the axis was analyzed. The results show that the smaller the match clearance or the higher the revolving speed, the greater the load capacity of bearing, but the small clearance is disadvantageous to the flowing of blood cell, the power loss will increase quickly with the rising of speed. The match clearance of blood pump driven by extra magnetic field should be 0. 002 mm.