JD - I just thought he was labelling his different test blocks consecutively, lol :shrug:
Slipstream - actually the main discussion here was affects of channel geometry to velocity and using CFD software
(at least that's been my take on it)
Brad - regarding the angled input... that would help lower the inlet restriction and decrease the side of the low flow area at the inlet, but an easier way to address the problem of the low flow in the back 1/3 of the inlet area might be to simply offset the inlet from the die's location so that area is outside where you are wanting maximum heat transfer rates (which is over the die). In the case of a spiral, that kind of fubars things though, so an alternative would be altering the inlet area's geometry to address the problem.