<P> In nonideal fluid dynamics , the Hagen -- Poiseuille equation , also known as the Hagen -- Poiseuille law , Poiseuille law or Poiseuille equation , is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section . It can be successfully applied to air flow in lung alveoli , for the flow through a drinking straw or through a hypodermic needle . It was experimentally derived independently by Jean Léonard Marie Poiseuille in 1838 and Gotthilf Heinrich Ludwig Hagen , and published by Poiseuille in 1840 -- 41 and 1846 . </P>
<P> In nonideal fluid dynamics , the Hagen -- Poiseuille equation , also known as the Hagen -- Poiseuille law , Poiseuille law or Poiseuille equation , is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section . It can be successfully applied to air flow in lung alveoli , for the flow through a drinking straw or through a hypodermic needle . It was experimentally derived independently by Jean Léonard Marie Poiseuille in 1838 and Gotthilf Heinrich Ludwig Hagen , and published by Poiseuille in 1840 -- 41 and 1846 . </P>
the velocity distribution in laminar flow through a circular pipe follows the law
the velocity distribution in laminar flow through a circular pipe follows the law
Hagen -- Poiseuille
Hagen -- Poiseuille