Poiseuille's Formula

The Poiseuille's formula express the disharged streamlined volume flow through a smooth-walled circular pipe:

V = π p r⁴ / 8 η l                        (1)

where 

V = discharge volume flow (m³/s)

p = pressure difference between the ends of the pipe (N/m², Pa)

r = internal radius of pipe (m)

l = length of pipe (m)

η = viscosity of fluid

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