Because turbulence increases the rate of convection, {HEAD ~ the turbulent action} created by the protrusions in the first row increases the rate of {TAIL ~ convection} of the cooling system 
Because turbulence increases the rate of convection , { HEAD ~ the turbulent action } created by the protrusions in the first row increases the rate of { TAIL ~ convection } of the cooling system
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH