Its external surface, together with that of the innermost nozzle, creates an aerodynamically designed entity to help enforce the swirling action and {HEAD ~ the outward speed} by using {TAIL ~ the Coanda effect} 
by using
Its external surface , together with that of the innermost nozzle , creates an aerodynamically designed entity to help enforce the swirling action and { HEAD ~ the outward speed } by using { TAIL ~ the Coanda effect }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL