wherein the fluid handling apparatus comprises {HEAD ~ heat exchange apparatus} of the shell and tube type, wherein each tube has therein {TAIL ~ an interrupter structure}, and wherein each tube has at least one interrupter structure in contact with its external surface through which heat exchange takes place to fluid in the shell thereof, each last mentioned interrupter structure comprising: 
wherein the fluid handling apparatus comprises { HEAD ~ heat exchange apparatus } of the shell and tube type , wherein each tube has therein { TAIL ~ an interrupter structure } , and wherein each tube has at least one interrupter structure in contact with its external surface through which heat exchange takes place to fluid in the shell thereof , each last mentioned interrupter structure comprising :
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH