I managed to coax the wind-tunnel fan to run at 93 r/min for a data run, extending test coverage down to Re=8000. Where my earlier plot showed points clustering around the L4-norm of the Scaled-Colburn-Analogy-Asymptotes, the new point aligns with the others along the asymptotes themselves, as predicted by my SCAA formula:
|NuSCAA = max(Nu8.9, Nu8.11, NuRS)|
The small convection from 0093rpm-20151125T170700 and 0109rpm-20151031T023629 also confirm that mixed convection uses a high degree norm (the highest being the "max" function). This essentially says that natural and forced convection do not mix; it is either one or the other. When the Convection Machine gets fitted with a smaller fan, I will be able to test at the transition point.