xx "If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward." Martin Luther King Jr, United States xxi Sub-and superscripts CoO Referred to cooling oil conv Referred to convection xxxiii comb Referred to combustion eff Referred to effective area embed Referred to embedded exh Referred to exhaust ext Referred to external wall temperature ThO Referred to thermal oil in Referred to inlet ind Referred to indicated int Referred to intake opt Referred to optimal out Referred to outlet sat Referred to saturation tot Referred to total resistance vap Referred to vaporization vol Referred to volumetric