Molecular viscosity distribution in the left coronary artery tree

The purpose of this study is to elucidate, probably for the first time, the distribution of the molecular viscosity in the entire left coronary artery (LCA) tree. A three-dimensional computer model of the normal LCA tree, reported previously, was adopted for subsequent numerical analysis. The governing mass, momentum and energy flow equations were solved using a previously validated numerical (finite-element analysis) code. The calculated results show high molecular viscosity regions appearing in zones opposite to all left coronary artery flow dividers on either of the two sides. These are regions where atherosclerotic plaques usually develop. Viscosity values change throughout the flow field. The distribution of high molecular viscosity along the walls is in agreement with the prone to atherosclerosis regions.