This is strictly applicable to steady (non-pulsatile) laminar (non-turbulent) flow of a Newtonian fluid (non-compressible fluid of uniform viscosity) within a straight, rigid, cylindrical tube. However, it can be used to derive the viscous energy losses associated with the flow of blood.
. pressure difference x radius4
viscosity x length
Poiseuille's formula is:
fil pressure difference between the ends of a tube x radius'
8 x length of tube x viscosity
Where Q — volume flow per unit time
AP = pressure head r — radius I — length of tube Z — viscosity of the fluid The circulatory system uses blood pressure and radius of vessels for the short-term control of blood flow rate.
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