The barrier, after I did some reading on jet impingement cooling, is actually a very fine "film" or area at the very surface of the material where the liquid is actually not moving. The jet impingement uses a high pressure jet to blast the surface which minimzes this barrier. Kinda like "approaches zero but never totally reaches it". I assume thinning the material barrier will help as well as it is a barrier.
I'm new to this too and did a lot of searching yesterday after seeing the cascade thread. There are a lot of universeties etc... doing research on microprocessor cooling I found out. So far it looked to me like jet impingement is the best thing they've come up with.
Hope this helps, I was trying to make my own design as well and found out I was going down the wrong path. Seems the science behind this stuff was already pretty well established, now it's down to who can design the one with the best preformance. Kind of a bumber IMO.
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