[bobo5195]

i know i said no more tonight but oh well.

We're engineers dont bring philosopy into this :P . At the end of the day though engineering becomes making up graphs out of nothing.

my definition is boundary layer is the fluid movement boundary layer, while the thermal boundary layer is outside/inside this as defined by the nuselt number? (too late at night to be sure and the nu was never explained to us as anything more than a hand wave)
Both are the boundary layer but since your talking about heat transfer striclty its better to keep them seperate for clarity.

Personally im less keen in performance but more in bring costs down alot and eeking out a little more heat transfer. The pulsing jet thing suggests to me costs (motors etc) but i was thinking you could just set up a fan to power something (under water fan connected to something to block off holes). This sounds like a gimmick and in away it is but as billA says blings sells. Im not sure what you mean by scimitar though, need a pen and paper really.

For disrupting the boundary layer roughness is always a good bet but that requires alot of science stuff i would of thought.

Oh and im like the A team if you can hire me as i dont have a 4th year project proper yet.