Viscosity can be conceptualized as quantifying the internal frictional force that arises between adjacent layers of fluid that are in relative motion. Where is the velocity of blood in the axial direction is the yield stress and is the viscosity coefficient of Casson fluid. For gases we use Sutherland equation that is viscosity bsqrtT1sT where b s are constants.
R Radius of the capillary tube.
P Pressure applied. One square meter per second is equal to ten thousand stokes. T Time of flow in seconds. The SI unit of kinematic viscosity is the square meter per second m 2 s which has no special name.