摘要
结合径向滑动轴承不同配合间隙,分析了血液润滑膜组分变化机制及组分变化对血液润滑稳定性的影响规律,提出了保证血液稳定润滑的最小膜厚。结果表明:在低剪变率范围,红细胞压积(hemotocrit,HCT)愈大,血液的非牛顿特性愈明显,当剪变率较大时,各种HCT的血液均呈现牛顿流体特性,HCT愈大,高剪切条件下血液的表观粘度愈大,血液从非牛顿特性转变为牛顿特性所需的剪变率愈大;在同一剪变率下,随着血液HCT增加,血液的表观粘度呈加速增加;当润滑血膜的最小膜厚大于12μm时,才能从机械上和生理上保证血液的有效润滑。
Based on different fit clearance of journal sliding bearing, the constituent changing mechanism of blood lubricant film and its influence on blood lubrication stability were analyzed, the minimum thickness of film for stable lubricant of blood was brought forward. Result shows that the bigger the hemotocrit under the low shear rate, the more evident the non-Newtonian characteristics of blood, and the blood of different hemotocrit all presents Newtonian characteristics under higher shear rate. The bigger the hemotocrit, the greater the apparent viscosity under the high shear rate, and the higher shear rate for blood changing from non-Newtonian fluid to Newtonian fluid. At same shear rate, the apparent viscosity of blood increases with the increasing of hemotocrit. In order to ensure effective lubricant of blood in mechanics and physiology,the minimum lubricant film must be greater than 12 μm.
出处
《润滑与密封》
CAS
CSCD
北大核心
2007年第2期23-25,共3页
Lubrication Engineering
基金
国家自然科学基金项目(50275151)
关键词
红细胞压积
血液
润滑
稳定性
hemotocrit
blood ： lubrication
stability
