Poiseuilles Principle says that the flow rate is proportional to (radius of the pipe)^4, while the continuity equation says that the flow rate is proportional to (radius of the pipe)^2. They seem to give two different relationships on flow rate and radius of the pipe.
Which leads me to my question when do you use Poiseuilles principle and when do you use flow rate? Do you use Poiseuilles Principle when there is viscosity/friction within a fluid, while you use the continuity equation for ideal flow?
Which leads me to my question when do you use Poiseuilles principle and when do you use flow rate? Do you use Poiseuilles Principle when there is viscosity/friction within a fluid, while you use the continuity equation for ideal flow?