Derivable from the Darcy-Weisbach equation, Wilberforce and Hagenbach attempted to extend the idea to turbulent flow, and the equation sometimes bears Hagenbach's name.
Attempts to use this equation in studies of the circulatory system have been difficult in large arteries due to variations in the viscosity, but is quite accurate for capillaries. When drawing analogies with electrical circuits, it is roughly equivalent to Ohm's law. Derivable from the Darcy-Weisbach equation, Wilberforce and Hagenbach attempted to extend the idea to turbulent flow, and the equation sometimes bears Hagenbach's name. Also derivable from the Navier-Stokes equations, this is, FTP, what equation which relates the internal radius, viscosity, characteristic length, and pressure difference to the flux flowing through a cylindrical tube with constant circular cross- section?
Attempts to use this equation in studies of the circulatory system have been difficult in large arteries due to variations in the viscosity, but is quite accurate for capillaries.
Poiseuille’s equation