reducing pipe diameter - flow change

[squidgy]

I currently have a pipe in a cooling system with an area of 16.14mm2. The measured flow rate is 8l/min. I don't know the pressure drop across the pipe or the fluid velocity. Is it possible to estimate the new flow rate if I reduce the tube area to 12.80mm2? Assuming an inlet pressure of 4bar.

[admin]

Relation between pressure drop, flow rate and pipe diameter can be calculated using Darcy formula.
Or you can use pressure drop calculator.