Les, there are effects due to the jet impingement that play out sub-optimally with the jet height of 4mm and using 0.8mm channels. Also the wall width vs wall height is a little low. These are all things that I noticed in the development of the design originally.
Overall I would not have thought it would make more than a 0.01C/W difference though, hence my statement that something else is also probably going wrong.
|