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