A vertical pipe member is adapted to receive {HEAD ~ a liquid gas mixture} having {TAIL ~ gas bubbles} of larger diameter therein 
A vertical pipe member is adapted to receive { HEAD ~ a liquid gas mixture } having { TAIL ~ gas bubbles } of larger diameter therein
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH