摘要
在细小血管中 ,由于血细胞明显的趋轴效应 ,管中的血液分为两个不同的区域 ,即具有血细胞的核心区和邻近管壁的血浆层。应用两相分层流模型 ,研究在相同的流量和管径下 ,当核心区中的血液分别为牛顿流体和Casson流体时 ,不同的血浆层厚度对细小血管壁剪应力和剪应力梯度的影响。结果表明 ,血浆层的存在对壁剪应力和壁剪应力梯度有较大影响 ,当血浆层厚度仅为血管半径的1 %和3 %时 ,壁剪应力和壁剪应力梯度分别下降约10 %和20 %。
Blood in small blood vessels, as a result of the tending to axis effect of blood cells, separates into two different areas, that is, a core area with blood cells and a plasma layer near wall. By applying two-phase stratified flow model in which blood in the core area is considered as Newtonian fluid and Casson fluid respectively, in the condition of the same flow rate and the same radius, influences of the plasma layer on vessel wall shear stress and shear stress gradient are researched. The results show that the existence of the plasma layer may obviously change the wall shear stress and the wall shear stress gradient. Such as, the wall shear stress and the wall shear stress gradient decreases about 10% and 20%, when the thickness of the plasma layer being only 1% and 3% of the radius of blood vessel.
出处
《生物物理学报》
CAS
CSCD
北大核心
2002年第1期113-116,共4页
Acta Biophysica Sinica
关键词
血管壁
两相流
血浆层
壁剪应力梯度
Two-phase flow
Plasma layer
Wall shear stress
Wall shear stress gradient
