{HEAD ~ The spiral flow} increases {TAIL ~ the rate} of convection and thus increases the cooling capacity of the cooling system 
{ HEAD ~ The spiral flow } increases { TAIL ~ the rate } of convection and thus increases the cooling capacity of the cooling system
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