Consider two streams of air flowing through the nozzles to an unlimited volume with atmospheric pressure.
The flow is the same, but the cross section areas of the circular nozzles and the speeds differ, so the flow through the smaller nozzle is proportionally faster.
Intuitively, the stream which is faster at the nozzle would transfer the air farther.
Is there any empirical rule which can be used to measure air stream dissipation rates given the initial speed and nozzle cross section area?
I am aware of Lattice-Bolzmann numerical methods, and can run the experiments too, but as i am new to air dynamics, may be I am overlooking something obvious.