text: Total volumetric flow rate is the algebraic sum of the flow rates in core and plasma region. The expression for the total volumetric flow rate can be written as:
  Comparison with the viscosity which applies in the Poiseuille flow yields effective viscosity,  as:
  It can be realized when the radius of the blood vessel is much larger than the thickness of the cell-free plasma layer, the effective viscosity is equal to bulk blood viscosity  at high shear rates (Newtonian fluid).
  Relation between hematocrit and apparent/effective viscosity
  Conservation of Mass Requires:
   = Average Red Blood Cell (RBC) volume fraction in small capillary
  = Average RBC volume fraction in the core layer
  Blood viscosity as a fraction of hematocrit: