Study about Rheological Behavior of Human Blood: Interrelationship between Two Models

Existing models of viscosity including models Carreau-Gambaruto and Quemada, are approximate because it is difficult to introduce all the factors affecting the viscosity. The viscoelasticity of blood and the newly established viscoelasticity of plasma should bring more light to blood rheology. Medical, fluid mechanics and rheology experts are still quite interested in the flow of blood. There are many models that exist that show the apparent viscosity as a function of shear stress; we will focus on the Quemada and Carreau-Gambaruto models for our discussion. The comparison between models and viscosity measurements showed discordance for shear rates below a few tenths of s.-1. The existence of an inflection point on the experimental curve is probably related to a system relaxation due to the rupture of the red blood cell structure named rouleaux.