According to Bernoullis principle, the pressure of {TAIL ~ the slow traveling air} in the gap 70 near the outlet end 56 is higher than {HEAD ~ the pressure} of the fast traveling air exiting the truncated cone 52 
According to Bernoullis principle , the pressure of { TAIL ~ the slow traveling air } in the gap 70 near the outlet end 56 is higher than { HEAD ~ the pressure } of the fast traveling air exiting the truncated cone 52
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH