Volume flow rate per unit length (Λ) is a measure of the amount of fluid that passes through a specific cross-sectional area of a pipe or conduit per unit length of that pipe. It is a parameter used to characterize and compare fluid flow in different pipes or channels while accounting for their varying lengths.
- Λ is the volume flow rate per unit length
- 2πr represents the circumference of the cylindrical cross-section of the pipe
- r is the radius of the cross-section
- Vr represents the radial velocity