> I had thought of many possible Rube Goldberg style ideas, but my
> primary objective is to figure out the efficiency of my heat
> exchanger, not to test flow rate.
> Paddle wheels and propellers are pretty common in this arena, but this

For REAL creativity you need Heath Robinson.
Rube was just a beginner.

New Zealand exports iron-sand to Japan.
This is pumped as a water slurry to tankers moored offshore, the water
is discarded overboard and the sand is retained.
Flow measurement was wanted.
The material is very abrasive and dense and in-line obstructions were
"unwelcome".
The solution, implemented by the Auckland University (now decades ago)
was to use auto correlation of electrical signals in the iron sand
offset by a known distance. Time to peak autocorrelation gave flow
velocity. Newtonianness, flow profile and more no doubt gave them lots
of fun.


 R
--=20
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