The first reaction chamber is arranged in {TAIL ~ continuous fluid communication} with {HEAD ~ the downstream conduit} and has a preselected first effective surface area 
The first reaction chamber is arranged in { TAIL ~ continuous fluid communication } with { HEAD ~ the downstream conduit } and has a preselected first effective surface area
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH