text: Consider steady flow of blood through a capillary of radius . The capillary cross section can be divided into a core region and cell-free plasma region near the wall. The governing equations for both regions can be given by the following equations:
  where:
  : is the pressure drop across the capillary
  : is the length of capillary
  : is velocity in core region
  : is velocity of plasma in cell-free region
  : is viscosity in core region
  : is viscosity of plasma in cell-free region
  : is the cell-free plasma layer thickness