 theori mix chemic reaction oppos jet diffus flame theori mix chemic reaction oppos jet diffus flame ideal flow system potter butler analyz differenti equat mix solv exactli locat burn rate flame solut chemic kinet differenti equat discuss relat deriv jet flow rate extinct chemic kinet constant laminar flame speed premix gase jet flow rate extinct independ transport properti comparison experiment data potter heimel butler argu experi carri higher reynold number measur quantit analyz 