the inner diameter of said holes in the respective said regions varies in different said baffle plates, whereby radial flow of the heat transfer fluid in {HEAD ~ said shell} is established between {TAIL ~ said baffle plates} 
the inner diameter of said holes in the respective said regions varies in different said baffle plates , whereby radial flow of the heat transfer fluid in { HEAD ~ said shell } is established between { TAIL ~ said baffle plates }
OTH OTH OTH 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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL