{HEAD ~ The melt and gaseous flow medium} is passed through {TAIL ~ a Laval nozzle} at a supersonic speed 
{ HEAD ~ The melt and gaseous flow medium } is passed through { TAIL ~ a Laval nozzle } at a supersonic speed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH