MihsabaHow to use
For steady incompressible flow, volumetric rate Q stays constant across sections, so velocity falls as area grows and vice versa.
- Enter A₁ and v₁.
- Choose v₂ or A₂.
- Enter the other known value.
- Review result and Q.
How it is calculated
Q=A₁v₁=A₂v₂
Example
If area falls from 0.01 to 0.005 m² at v₁=2 m/s, v₂ becomes 4 m/s.
Important notes
This volumetric form assumes incompressible flow; variable-density gas flow needs mass continuity.
Frequently asked questions
Why faster in a narrower pipe?
To keep Q=A·v constant.
Is A diameter?
No, cross-sectional area.
Works for gases?
Only when density changes are negligible.