I can't see the pic. If you want, email it to me and I can host it for you.

I considered an asymetric design but from my experience and results the nozzle should be the shape of the design your using. So i'm stuck with round nozzle shapes. I have a slight problem with unbalanced flow with my new block as I could tell because more water seemed to flow from one side more. Actually shooting out one side more. I could hear the impingement hissing. It could be because I had trouble tapping the outlet holes - they got a little crooked. .25 inch isn't easy to get a tap straight in it.

I have no way of milling micro-channels nicely. If I could, I would be doing that and trying to incorporate my impingement ideas into that.

Your block idea sounds like it's coming along nicely. Sounds like a performer.

I may make a jet impingement block just to see how it performs, btw my pics may be going down more often because my school's server ( where i host my pics) is having troubles.

Hey I see your pic now. That's exactly the idea I had just without my tapered base which i'm wondeing if the taper base helps any. The only thing I would change is move that nozzle closer to the base. What happens is that the surounding water that the jet is passing through effects the volocity of the jet stream which slows it down and lowers the pressure against the base making the stagnation area smaller. Plus the water that just hit the base is now heated up and will tend to swirl up and back into the jet stream and recyclng that warm water. Closer to the base and that will be avoided. Also make the nozzle so that it's flat at the tip. That will keep old water from getting into the stagnation area and help keep the volocity up after it hits the base. Plus it helps guide it across the base. That was my first mistake on my first block.

Doing a submerged jet inpingement in a water block is different. My first time I looked at as a water jet hitting a plate and forgetting it was submerged. If you could look at the jet impingement magnified you would see small vortexes(sp?) being created right at the surface of fast moving water the impingment creates. The water surrounding it effects it greatly. After the jet hits the base it thins or eliminates the boundary layer and spreads out with high velocity. Called the stagnation area. This fast or higher velocity water will actually create a vortex of heated water from the water sorrounding the jet impingement that will help heat the new cooler water hitting the base. We don't need that. So it's best to keep the nozzle close to the base, make the tip of the base flat or the same shape as the base so that it covers the area just above the stagnation area. This will make sure that the impingement is not effected by any old heated water and it's velocity won't be effected by surrounding water.

The idea is to keep all stagnate water away from the impingement.

I'd put a jet impingement block done right on par with performance to a micro-channel block any day. Mixing the two just right might be even better.

My pic was only a demonstration of a was you could build a Parabolic Nozzle. after reading all of this I think that It seems easier to build one of these blocks than the block that I am going to. I'll just buy extra Copper to make expirimental Blocks.

The reason for this is I believe that performace on par with cathar's block could be accieved without the reletively huge price.

I'll post a pic tonite of a impingement style block that I had in mind.