Quote:
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Originally Posted by Les
Cathar
I am surprised by the "1.7x" in
"jet velocities for the Storm are typically about 1.7x that of what occurs within the Cascade when given the same pump."
An extension of the discussion would suggest a lower number. :-
Does not(yet) include "tubing + radiator" pressure drop . However, suggest, their inclusion further reduces the effect of "Total Orifice Area" area |
Don't know what to say Les. I'm just reporting what I measured, and not extrapolating from theoretical pressure drops.
Here's a chart of the 50Hz MD-30RZ jet velocities with a singular diameter hole with a flattish (67° from the pepenpendicular) straight chamfer. These are measured values, not theoretical extrapolations. The Storm's jet inlets are significantly more optimised than either the following test results, or the Cascade jet inlets.
Iwaki MD30Z
2.00mm 2.25 LPM 11.9m/s
2.78mm 4.20 LPM 11.5m/s
3.18mm 5.30 LPM 11.2m/s
3.50mm 6.40 LPM 11.1m/s
4.00mm 8.00 LPM 10.6m/s
4.37mm 9.00 LPM 10.0m/s
1.7x was vs a full system where the pressure drop of tubing + radiator is more significant for the pump to work against for the Cascade vs the Storm. Could get as low as 1.55x for some weaker low-head pumps I guess, but pretty close to the 1.7x mark for the higher head style DC pumps.