Hi LnS and rudderrudderrat;
I'm still amazed by the treasures available on the net if you know where to find them - many thanks rrrrt! The document describes impingement cooling and film cooling, but I couldn't find convection cooling. On another thread on PPRuNe, with some help of Wikipedia, I learned that 'convection' generally refers to a process of mixing. Maybe that helps.
regards,
HN39