Resistance of blood flow Poiseuille law:Q=π△Pr4/8nl m: viscosity r: radius of the vessel L: length of the vessel R=8nL/ir Q=△P/R Jean Louis Marie Poiseuille lpwa-zai(April 22, 1799-December 26, 1869) was a French physician and physiologist. Poiseuille was born in Paris, france From 1815 to 1816 he studied at the Ecole Polytechnique in Paris. He was trained in physics and mathematics. In 1828 he earned his D Sc degree with a dissertation entitled Recherches sur la force du coeur aortigue. he was interested in the flow of human blood in narrow tubes.Poiseuille Law: Q=pDPr4 /8hL h: viscosity r: radius of the vessel L: length of the vessel Q= DP/R Resistance of blood flow R= 8hL/pr 4 Jean Louis Marie Poiseuille \pwä-'zəi\ (April 22, 1799 - December 26, 1869) was a French physician and physiologist. Poiseuille was born in Paris, France. From 1815 to 1816 he studied at the École Polytechnique in Paris. He was trained in physics and mathematics. In 1828 he earned his D.Sc. degree with a dissertation entitled Recherches sur la force du coeur aortique. He was interested in the flow of human blood in narrow tubes