Table 4: FEM results of air mass balance and flow speed by two bullae, one of diameter 5 mm.

Data	Mass balance (kg/s)
	Bulla diameter size (mm)
	1.25	2.5	3.75	5
Maximum speed (m/s)	15.611	17.418	21.644	18.185
Inlet	16.851 x 10-5	15.734 x 10-5	15.001 x 10-5	7.292 x 10-5
Outlet 1	-8.213 x 10-5	-7.719 x 10-5	-7.265 x 10-5	-3.412 x 10-5
Outlet 2	-8.649 x 10-5	--8.030 x 10-5	-7.753 x 10-5	-3.885 x 10-5
Loss	-0.010 x 10-5	-0.016 x 10-7	-0.017 x 10-5	-6.223 x 10-5