The coolant is introduced into the channels co currently with the direction of {HEAD ~ flow} of {TAIL ~ the reactants} 
The coolant is introduced into the channels co currently with the direction of { HEAD ~ flow } of { TAIL ~ the reactants }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL