It doesn't really need a nozzel. The block is pretty restrictive as is which in turn creates it's own volocity with out a nozzel. Also there isn't enough space for a nozzel to do any good. I have these setup like #Rotors drilled blocks. Both the base and the top have the channels in them. So a nozzel really wouldn't work. Esapecially being I am still stuck with a 170GPH pump which will be struggling. I will say though BOTH these blocks will have more flow than my original micro channel. Which is good for smaller pumps.
Being restrictive is a good thing. For some reason people thing less restrictive blocks are better but they are not. I designed these to be very restrictive to create a lot of volocity through the middle area which should in turn creat a good amount of turbulance and lower the boundry layer.
At least that is my theory. Seemed to work well with my original micro channel block even at extreamly low flow rate. The micro channel one is kinda misleading by the pics. those 4 channels are a lot larger than they look. I used a bit with more slop on the V to make them wider. they are also deeper and also added to the top. That block is more of couriosity thing than anything. Only took 30mins to make and I had nothing else to do at work today.
As for tests, they will come in time. I told my engineer buddy I would show him the parts before I put them together and sealed them. I will be going to his place Sunday. So maybe Sunday evening I might have one of them hooked up. I really need a better pump though. Once I get some cash I will pick up a better one.