{HEAD ~ A flow passageway} of fluid on the side of the shell is composed of {TAIL ~ annular spaces} formed between the outer circumference of the heat transfer tubes and the inner circumferences of the holes in the baffle plates 
is composed of
{ HEAD ~ A flow passageway } of fluid on the side of the shell is composed of { TAIL ~ annular spaces } formed between the outer circumference of the heat transfer tubes and the inner circumferences of the holes in the baffle plates
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH