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Originally Posted by davidzo
No, do a little research on the reynolds formula and you will realize that besides the velocity, the channel diameter is the most important factor of Turbulence. When two channels have water with the same middle velocity flowing through them, the channel with the smaller width will have the more turbulence.
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So we have a variance in the Reynolds occuring at various points in the pin grid (height). I don't think the impact in effective heat transfer performance is really a need for concern, nor would I really be able to come up with a reasonable solution to eliminate these variances. One fix may be to reduce pin height, which would decrease the height of the plenum. This would have the nasty side of effect of reducing the cross-sectional area of the plenum to something I wouldn't be terribly pleased with. Pin height, as it's designed, is something of a priority since it also impacts how other areas are to be designed (to be most effective). As long as the pins hold up to the slitting saw, I'll be satisfied with them.
May be experimenting with different inlet configurations. I previously considered a simple White Water style slit, and may end up giving this a shot. The only real snag with this is that the middle plate is a fairly elaborate component to machine. Having a number of different mid plates, however, may prove to be a pretty good exploratory value.