Question

What is a good estimation of flow rate as a function of pressure difference with turbulent flow?

Answer 1

Whether a flow will result in laminar or turbulent
flow is primarily determined by the Reynolds
number,
Re =
ρvD
μ
density is
ρ
, diameter of pipe is
D
, fluid velocity is
v
and viscosity is
μ
.
•
The flow is laminar for
Re
<
2000
•
The flow is transitional between
2000
<
Re
<
4000
•
The flow is turbulent for
Re
>
4000
Values depend on shape of pipe, roughness, shape of
pipe inlet. The limits are also soft numbers