The apparatus is provided with an interrupter structure for disrupting {HEAD ~ the fluid boundary layers} at {TAIL ~ the walls} of the apparatus and promoting mixing of the separated boundary layers with the adjacent core layers 
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The apparatus is provided with an interrupter structure for disrupting { HEAD ~ the fluid boundary layers } at { TAIL ~ the walls } of the apparatus and promoting mixing of the separated boundary layers with the adjacent core layers
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH