Poiseuille's Hagen law is
Poiseuille-Hagen FormulaThe relation between the flow in a long narrow tube, the viscosity of the fluid, and the radius of the tube is expressed mathematically in the Poiseuille-Hagen formula:F = (PA-PB) X (dj/8) X (1/dj) X (r4/L)whereF = FlowPA-PB = Pressure difference between the two ends of the tubedj = Viscosityr = Radius of tubeL = Length of tube
F = (PA-PB) X 3.14 X r^4/8nl
F = (PA+PB) X 3.14 X r^4/8nl
F = (PA/PB) X 3.14 X r^4/8nl
F = (PA X PB) X 3.14 X r^4/8nl
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