Numerical Based Analysis of Hematocit Effect in Stented Coronary Artery

The problem of the non-Newtonian fluid flow in the complex geometries (pipes), whose domain of application is very varied, is a topic of interest to both physicists, industrialists and medical doctors. Various studies have been made ??on cardiovascular problems and more precisely the effect of intra-vascular prosthesis on the stat of arteries. Indeed, obstruction of the arteries, whether coronary or carotid known as stenosis, represents a great danger to the people who are affected. It modifies the hemodynamic and consequently generates a detrimental effect on nutrition and oxygenation of organs (heart, kidney and brain..). Among the medical intravascular interventions this stenosis is referred to as stenting. The stent is a flexible and deformable metal object used to straighten the obstructed artery and keep it open. The presence of such an object into the blood vessel disrupts the flow of blood. In this regards, this paper is a numerical study to show how the presence of the stent in an artery influences the blood flow. In this work, the blood flow is considered as a Newtonian and non-Newtonian fluid whose behavior is described by the mathematical Carreau's models. The hematocrit variation ratio is in the range of 30 to 55% which cover the rate on anemia and normal levels. The presence of the stent has a very low effect on speed and pressure, however it decreases the overall shear stresses which could favors and promote restenosis.