German to English Science Energy / Power Generation

I have already asked a similar question where the solution was to just leave out durchströmt, as it was redundant. However, it is a very common word and translating it cannot always be avoided, as is the case here:

Druckverlust im laminar durchströmten Rohr

Pressure loss in a laminarily flown-through tube/pipe? The flown-through part sounds sort of German to me...
Pressure loss in a tube/pipe with laminar flow?
This is a heading from a textbook again, the section this is from contains practical examples on Kennzahlen (Fourier number, Damköhler number, Reynolds number etc.). Under the heading in question follows a calculation including the Navier-Stokes equation and the Reynolds number.