wherein {TAIL ~ the fluid handling apparatus} comprises heat exchange apparatus of the shell and tube type, wherein each tube has therein an interrupter structure, and wherein each tube has {HEAD ~ 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 { TAIL ~ the fluid handling apparatus } comprises heat exchange apparatus of the shell and tube type , wherein each tube has therein an interrupter structure , and wherein each tube has { HEAD ~ 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 TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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