一种新的血液本构方程理论和实验探讨  

Study on a New Rheological Equation of State for Blood

作　　者：曾德鸿[1] 陈槐卿[1] 

机构地区：[1]华西医大生物医学工程研究室,成都610041

出　　处：《生物医学工程学杂志》1997年第1期1-3,共3页Journal of Biomedical Engineering

摘　　要：在低剪切率下血液表现出明显的非牛顿流体性质，牛顿流体本构方程不再适用。本文理论上分析了简化Oldroyd方程对描述血液力学性质的适用性，讨论该本相关系对剪切稀化、触变应力过程及复粘度的概括说明。本文还数值求解了阶跃剪切下的触变应力过程，计算结果与测量曲线作了对比。Bood behaves like a Non-Newtonian fluid under low shear rate. A number of constitutive equationsfor blood have been proposed in the literature, but yet a general equation which demonstrates all aspects of blood'sNon-Newtonian characteristics has not been established. With this problem we analysed the Oldroyd Equation as apossible model for blood. Theory analysis indicated that the phenomena of blood now under low shear rate, suchas shear thinning, stress overshoot and phase delay in periodic flow, can be explained by intr0ducing the equationwith four parameters, suggesting it to be an appropriate model for blood-We tested the parameters. Stress versustime curves under rectangular step of shear rate were also tested and the results were compared with those of theo-ry prediction.

关 键 词：血液流变学 本构方程 剪切稀化 

分 类 号：R318.01[医药卫生—生物医学工程]