# Velocity of flue gases through a pipe

I was wondering if there is any equation that helps to calculate flue gas velocity through a pipe? Can I use the Poiseuille Equation to solve this problem by assuming the flue gas is acting as a newtonian fluid?

The pipe diameter is 3.66m, change in pressure is 3atm, length of the pipe is 10m, density of the flue gas is 0.811kg/m$^3$ at 150 ˚C, and the viscosity (C$_p$) is 0.0232.

• The assumption you need to make to use Hagen–Poiseuille equation is that flow is laminar while most probably it's turbulent. Edit your question and include all the data you know about the flue gas inside the pipe so we can help you.
– Algo
Mar 25 '16 at 4:04