[bobo5195]

Would recommend a different test setup. A better method might be to build something which makes the block HOT(300 to 400W) and do some scaling. That way cheap testing equipment can be used.

The differences in conductivity between copper tellurium and proper copper I think are small. They are going to effect things sure but the effort probably isn’t worth it.

As this is an educational project jets in cups have another bonus point. Jet impingement is extensively studied at university. Its used as a test for CFD programs and has heavy uses industry. If you did a test on proper test samples varying different parameters then the test would be of a publishable level in a scientific journal.

The walls at the base of the cup should be at right angles. When the jet hits the base of the wall it makes a thin film of water spraying out at high velocity; a wall jet. When this hits the cup wall it creates a jet impingement effect of a fast moving stream hitting a wall. In short you want the wall as square as possible and there should be a tool around to do this anyway.

My advice would be to ditch the turbulator from your design. The performance improvements are likely to be small. In a strict sense it doesn’t really turbulate the jet. I believe it introduces non-steady un-axisymmetric features in the jet. These cause the jet to pulse a little, which increases heat transfer. They also have the effect of reducing jet maximum speed is bad and while I’m sure cathar knows what he is doing I remain sceptical about the performance trade off.