血液替代流体黄原胶溶液流变特性实验

Experimental Investigation of Rheological Properties of Xanthan Gum Solutions as a Blood Analog Fluid

实验发现,黄原胶溶液是一种典型的剪切稀化非牛顿流体,其剪切应力和剪切速率基本符合幂律分布;黄原胶溶液浓度越高,其剪切稀化特性越强;黄原胶溶液的表观粘度与溶液温度和浓度均呈线性变化,但表观粘度的改变与溶液温度成反比关系,与溶液浓度成正比关系;人体血液的流变特性介于0．4‰和0．6‰黄原胶溶液(重量百分比)流变特性之间。

Developing a shear thinning non-Newtonian fluid to substitute blood is desirable in studies of biomedicine engineering since blood is a shearing thinning non-Newtonian fluid that exhibits both viscous and elastic properties, and generally not available in large volume The rheological properties of Xanthan gum aqueous solutions with different concentrations and temperatures were studied in present paper. The results show that Xanthan gum solution is a non-Newtonian fluid which displays remarkable shear thinning behavior and can be used as a blood analog fluid. There is a power law distribution relationship between shear stress and shear rate, and the higher the solution concentration is. The more strongly it displays shear thinning behaviors. Viscosity of Xanthan gum solutions changes with solution temperature and concentration in linearity, and its values increase with the solution temperature increasing or the solution concentration increasing. The experimental results show that, at temperature of 37℃, Xanthan gum solutions with 0.4%e and 0.6%e concentrations will match human blood best in rheological properties. According to the results, the viscosity expression varied with temperature and concentration is obtained, and the stability of Xanthan gum solutions is discussed.