a parameter, now known as the Womersley’s parameter was introduced:
centipoise) are the density and
viscosity of blood, respectively and r is the inner radius of the artery.
This parameter also represents the ratio of the relative contribution of
viscous component of blood flow. In other words,
it describes the ratio of the movement of blood mass to the retardation of
flow or flow resistance due to blood viscosity.
is also dependent on
arterial lumen radius, thus, the smaller the vessel, the smaller the value of
Morgan and Kiely made assumptions to arrive at wave velocity and
And for for
For extremely low frequencies, or in the case of very small vessels,
these equations can be compared to those derived earlier.