Jean Léonard Marie Poiseuille

Jean Léonard Marie Poiseuille was a French physician and physiologist whose experiments on blood flow and liquids in narrow tubes led to Poiseuille’s law.

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Poiseuille’s law: A relation describing laminar flow of a viscous fluid through a cylindrical tube. The law that bears Poiseuille’s name grew from his measurements of flow through narrow tubes.
Hagen–Poiseuille equation: An equation for the volume flow rate of a Newtonian fluid in steady laminar flow through a cylindrical pipe. This modern equation expresses the tube-flow relation associated with Poiseuille’s experiments.
Jean-Louis-Marie Poiseuille: A French physician and physiologist commonly identified in English as Jean Léonard Marie Poiseuille. This alternative rendering of his name appears in historical accounts and bibliographies.
Hemodynamics: The study of blood flow and the forces governing it within the cardiovascular system. Poiseuille’s fluid-flow ideas became a foundation for modeling circulation.
Laminar flow: Fluid motion in smooth layers with little mixing between neighboring paths. His tube-flow experiments concerned orderly motion rather than turbulent flow.
Pressure gradient: The change in pressure per unit distance through a fluid or across a material. A pressure drop along the tube supplies the force for the measured flow.
Julius Weisbach: A German engineer who developed empirical equations for fluid flow in pipes and channels. His independent work helped establish the pipe-flow relation also associated with Poiseuille.
Microfluidics: The science and technology of controlling small volumes of fluids in micrometer-scale channels. Its channel-flow calculations often use the same pressure, viscosity, and geometry relations.
Viscosity: A fluid’s resistance to deformation and flow under applied force. Poiseuille investigated how a liquid’s resistance affects its rate of flow.
Newtonian fluid: A fluid whose shear stress is proportional to its rate of deformation. The classical flow law applies to Newtonian fluids under its ideal conditions.