Here's a pic of the new nozzle configuration. I'm not quite sure why this picture is in black and white, and I know my photography stinks, so just cut me some slack on that, ok?
This design is about 5C cooler than my RBX under the same conditions, and is MUCH easier for me to make than my previous designs. Given the amount of power I am pushing at this point (about 135 watts), that means that I am able to handle another 50 watts or so of power.
Basically, what I did was I took my 1/2" tubing, and shaped about the last 3/4" of it into a rectangle that was approximately the size of the core (rather similar to my first design, actually). Then I cut the corners with my dremel and folded the long sides into the center until I had a slit about 1/16" wide, while leaving the short sides untouched to form 'ears' which help me seat the jet at the proper distance from the base inside my plastic cube. I then brazed the seam between the folded part and the straight part so that water had no choice but to exit through the slit over the core.
I came up with this approach because I was sitting one night thinking about my results up to this point, and realized that at least part of the reason I had gotten better results with the 4 jet job over the 8 jet job was probably because I had too many jets; the water was getting in the way of itself. I had lots of turbulence, but the warm water wasn't being efficiently removed from the path of the cool water. So I reasoned that the ideal jet would probably be something along this line in design; a stream that covers the center of the core and then spreads out along the surface to the edges, where it is removed.
I could really, REALLY use a simulator, but I don't know enough about hydrodynamics at this point to write my own (as Cathar supposedly did) and all the ones I've come across on the net are either written for Unix and don't have source code, or have some heinous licensing agreement to get the source code, or cost lots of money.
